Category: 4415-87-6

Kato, Shunsuke; Yusof, Fitri Adila Amat; Harimoto, Toyohiro; Takada, Kenji; Kaneko, Tatsuo; Kawai, Mika; Mitsumata, Tetsu published the artcile< Electric volume resistivity for biopolyimide using 4,4'-diamino-α-truxillic acid and 1,2,3,4-cyclobutanetetracarboxylic dianhydride>, Safety of Cyclobuta[1,2-c:3,4-c’]difuran-1,3,4,6(3aH,3bH,6aH,6bH)-tetraone, the main research area is biopolyimide film volume resistivity elec insulation property; biopolyimide; biopolymer; electric resistivity; polyimide.

Biopolyimides poly(ATA-CBDA), made from of 4,4′-diamino-α-truxillic acid di-Me ester (ATA) and 1,2,3,4-cyclobutanetetracarboxylic dianhydride (CBDA), is synthesized and measured its elec. volume resistivity at various exptl. conditions. The effects of film size, thickness, drying time, and the elec. field strength on elec. resistivity are investigated and compared with polyimide (Kapton). The elec. resistivity for all polyimide and biopolyimide are distributed in the range of 1015-1016 Ωcm, which shows that biopolyimide has high elec. insulation as well as polyimide. The elec. resistivity strongly depends on film thickness, which suggests that elec. resistivity is a function of elec. field strength. The critical elec. field for polyimide and biopolyimide films are determined to be 5.8 x 107 V/m and 3.2 x 107 V/m, resp. Humidity was found to strongly affect the elec. resistivity; ~1016 Ωcm at 34% RH and ~1013 Ωcm at 60% RH for both polyimide and biopolyimide films.

Polymers (Basel, Switzerland) published new progress about Electric breakdown. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Safety of Cyclobuta[1,2-c:3,4-c’]difuran-1,3,4,6(3aH,3bH,6aH,6bH)-tetraone.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Takemasa, Chiaki; Chino, Teppei; Ishige, Ryohei; Ando, Shinji published the artcile< Anisotropic photoconductivity of aromatic and semi-aliphatic polyimide films: Effects of charge transfer, molecular orientation, and polymer chain packing>, Related Products of 4415-87-6, the main research area is polyimide film aromatic polymer chain packing mol orientation photoconductivity.

The anisotropic photoconductive properties of polyimide (PI) films prepared using seven types of dianhydrides and a diamine containing a diphenyl-benzidine structure featuring rigid linear structure and strong electron-donating ability were analyzed. Photoirradiation wavelength dependences of the in-plane and out-of-plane photocurrents, which are known as anisotropic photocurrent spectra, were investigated in comparison with optical absorption spectra, the degrees of mol. aggregation, in-plane/out-of-plane orientation of PI chains, and ordered structures formed in film state. We have previously reported that intermol. charge transfer (CT) interaction is a key factor for increasing the out-of-plane photoconductivity of PI films because they determine the efficiency of charge separation However, when sufficient charge carriers are generated in thin PI films via photo irradiation, in which penetration depth of irradiated light is sufficiently larger than the film thickness, suppression of charge recombination by reducing mol. chain packing is rather effective at enhancing both the in-plane and out-of-plane photoconductivity This is because the mobility of carriers is significantly increased in the dense aggregation structures, and thus collisions between carriers becomes more frequent, which led to higher recombination efficiency. Furthermore, the photocurrent anisotropy was increased as the degree of in-plane orientation of the main PI chains increased, which agrees with the fact that charged carriers are preferentially transported between PI chains. Accordingly, promoting charge transport efficiency by reducing PI chain packing and increasing the out-of-plane orientation of PI chains are essential to increase the in-plane photoconductivity of PI films.

Polymer published new progress about Molecular orientation. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Related Products of 4415-87-6.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Mai, Anh Thi Minh; Thakur, Ashutosh; Ton, Nhan Nu Thanh; Nguyen, Thanh Nhat; Kaneko, Tatsuo; Taniike, Toshiaki published the artcile< Photodegradation of a semi-aromatic bio-derived polyimide>, Formula: C8H4O6, the main research area is semi aromatic polyimide photodegradation mech property.

Recently, we have developed a thermoelec. superior and highly transparent bio-derived polyimide using microorganism-derived 4-aminocinnamic acid. Here, the stability of the novel bio-derived polyimide under photoirradiation was systematically investigated. IR spectroscopy (IR), solid-state NMR, and tensile tests were employed for studying the impacts of the irradiation on both chem. and mech. properties of the material. The structural modifications of the material were analyzed in the form of spectral expression of correlation coefficients It was found that the bio-derived polyimide maintained its stability well up to several hundreds of hours. Elongated radiation caused deterioration at the imide ring and the tertiary carbon of the cyclobutane ring, accompanied by the growth of carbonyl species as an oxidation product.

Polymer Degradation and Stability published new progress about Elongation at break. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Formula: C8H4O6.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Zhang, Qingfei; Kuang, Gaizhen; Zhou, Dongfang; Qi, Yanxin; Wang, Mingzhe; Li, Xiaoyuan; Huang, Yubin published the artcile< Photoactivated polyprodrug nanoparticles for effective light-controlled Pt(IV) and siRNA codelivery to achieve synergistic cancer therapy>, Reference of 4415-87-6, the main research area is photoactivated platinum polyprodrug nanoparticle Bcl2 siRNA synergy cancer therapy.

Endo/lysosomal escape and the subsequent controllable/precise release of drugs and genes are key challenges for efficient synergistic cancer therapy. Herein, we report a photoactivated polyprodrug nanoparticle system (PPNPsiRNA) centered on effective light-controlled codelivery of Pt(IV) prodrug and siRNA for synergistic cancer therapy. Under green-light irradiation, PPNPsiRNA can sustainedly generate oxygen-independent azidyl radicals to facilitate endo/lysosomal escape through the photochem. internalization (PCI) mechanism. Besides, concurrent Pt(II) release and siRNA unpacking could occur in a controllable manner after the decomposition of Pt(IV), main chain shattering of photoactivated polyprodrug and the PPNPsiRNA disassocn. Based on these innovative features, excellent synergistic therapeutic efficacy of chemo- and RNAi therapies of PPNPsiBcl-2 could be achieved on ovarian cancer cells under light irradiation The facile synthesized and prepared photoactivatable polyprodrug nanoparticle system provides a new strategy for effective gene/drug codelivery, where controllable endo/lysosomal escape and the subsequent drug/gene release/unpacking play vital roles, which could be adopted as a versatile codelivery nanoplatform for the treatment of various cancers.

Journal of Materials Chemistry B: Materials for Biology and Medicine published new progress about Antitumor agents. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Reference of 4415-87-6.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Qian, Min; Xuan, Xiao Yang published the artcile< Hyperthermal atomic oxygen durable transparent silicon-reinforced polyimide>, Electric Literature of 4415-87-6, the main research area is polyimide POSS erosion surface property atomic oxygen.

A clear poly(amic acid) was reinforced by a trisilanolphenyl polyhedral oligomeric silsesquioxane (POSS) by direct dissolution, and transparent silicon-reinforced polyimide (Si-RPI) films with different POSS loadings were obtained after curing, showing high transmittance of >90% within 380-800 nm. The Si-RPI films were exposed to a ground hyperthermal at. oxygen (AO) beam. The erosion depths and derived erosion yields of the materials decreased with POSS loadings. At a 20 wt% POSS loading, the Si-RPI showed an erosion yield of 0.13 x 10-24 cm3 atom-1 at a fluence of 2.79 x 1020 O atoms cm-2. Surface morphol. and element composition characterization on Si-RPI indicated that SiOx-based passivating layers were formed on surfaces upon the hyperthermal AO attack. This study suggests a facile way of reinforcing Si into transparent polyimide for a promising candidate of spacecraft coating material operating in low Earth orbit.

High Performance Polymers published new progress about Erosion (wear). 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Electric Literature of 4415-87-6.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Hasegawa, Masatoshi; Takahashi, Shinya; Tsukuda, Soichi; Hirai, Tomoki; Ishii, Junichi; Yamashina, Yukari; Kawamura, Yoshinori published the artcile< Symmetric and asymmetric spiro-type colorless poly(ester imide)s with low coefficients of thermal expansion, high glass transition temperatures, and excellent solution-processability>, Reference of 4415-87-6, the main research area is spirofluorenylxanthenediol polyester polyimide thermal expansion transparency heat resistance solubility.

The authors present several new poly(ester imide)s (PEsIs) with low coefficients of thermal expansion (CTE), excellent optical transparency, very high heat resistance (Tg), film ductility, and solution-processability. Sym. and asym. spiro-type tetracarboxylic dianhydrides containing ester linkages (TA-s-Spiro and TA-a-Spiro) and diamines (AB-s-Spiro and AB-a-Spiro) were synthesized using xanthene-based isomeric bisphenols with a fluorenyl side group. The chem. imidized PEsIs were highly soluble in various common solvents including less polar nonamide solvents, and yielded stable solutions with high solid contents. The properties of the spiro-type PEsIs were systematically studied and compared with those of the cardo-type counterparts. A PEsI derived from 1,2,3,4-cyclobutanetetracarboxylic dianhydride (CBDA), AB-a-Spiro, and 2,2′-bis(trifluoromethyl)benzidine (TFMB) achieved outstanding combined properties, i.e., a very low CTE (10.5 ppm K-1), excellent optical transparency (YI = 3.4, T400 = 80.8%), a very high Tg (351°) and solution-processability. Thus, the PEsIs are promising candidates as novel plastic substrates for use in image display devices. The isomer effects on the properties were also studied and a possible mechanism for these effects is proposed.

Polymer published new progress about Atmospheric haze. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Reference of 4415-87-6.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Zhang, Mei; Liu, Weili; Gao, Xia; Cui, Peng; Zou, Tao; Hu, Guanghui; Tao, Liming; Zhai, Lei published the artcile< Preparation and characterization of semi-alicyclic polyimides containing trifluoromethyl groups for optoelectronic application>, Electric Literature of 4415-87-6, the main research area is polyimide trifluoromethyl group optoelectronic application; alicyclic structure; polyimide; structure–property relationship; transparency; trifluoromethyl.

Transparent polyimides (PI) films with outstanding overall performance are attractive for next generation optoelectronic and microelectronic applications. Semi-alicyclic PIs derived from alicyclic dianhydrides and aromatic diamines have proved effective to prepare transparent PIs with high transmittance. To optimize the combined properties of semi-alicyclic PIs, incorporating bulky trifluoromethyl groups into the backbones is regarded as a powerful tool. However, the lack of fundamental understanding of structure-property relationships of fluorinated semi-alicyclic PIs constrains the design and engineering of advanced films for such challenging applications. Herein, a series of semi-alicyclic PIs derived from alicyclic dianhydrides and trifluoromethyl-containing aromatic diamines was synthesized by solution polycondensation at high temperature The effects of alicyclic structures and bulky trifluoromethyl groups on thermal, dielec. and optical properties of PIs were investigated systematically. These PI films had excellent solubility, low water absorption and good mech. property. They showed high heat resistance with Tg in the range of 294-390 °C. It is noted that tensile strength and thermal stability were greatly affected by the rigid linkages and alicyclic moieties, resp. These films exhibited obviously low refractive indexes and significantly reduced dielec. constants from 2.61 to 2.76, together with low optical birefringence and dielec. anisotropy. Highly transparent films exhibited cutoff wavelength even as low as 298 nm and transmittance at 500 nm over 85%, displaying almost colorless appearance with yellowness index (b*) below 4.2. The remarkable optical improvement should be mainly ascribed to both weak electron-accepting alicyclic units and bulky electron-withdrawing trifluoromethyl or sulfone groups. The present work provides an effective strategy to design mol. structures of optically transparent PIs for a trade-off between solution-processability, low water uptake, good toughness, high heat resistance, low dielec. constant and excellent optical transparency.

Polymers (Basel, Switzerland) published new progress about Absorption. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Electric Literature of 4415-87-6.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Beaver, Matthew G.; Zhang, En-xuan; Liu, Zhi-qing; Zheng, Song-yuan; Wang, Bin; Lu, Jiang-ping; Tao, Jian; Gonzalez, Miguel; Jones, Sian; Tedrow, Jason S. published the artcile< Development and Execution of a Production-Scale Continuous [2 + 2] Photocycloaddition>, Recommanded Product: Cyclobuta[1,2-c:3,4-c’]difuran-1,3,4,6(3aH,3bH,6aH,6bH)-tetraone, the main research area is continuous photocycloaddition maleic anhydride ethylene cyclobutane.

This article details the approach to large-scale production of cyclobutane 2 by the continuous-flow [2 + 2] photocycloaddition of maleic anhydride and ethylene, including (1) focused reaction optimization and development of a robust isolation protocol, (2) the approach to equipment design and process safety, and (3) the results of commissioning tests and production runs delivering the target compound at throughputs exceeding 5 kg/day.

Organic Process Research & Development published new progress about Photocycloaddition reaction. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Recommanded Product: Cyclobuta[1,2-c:3,4-c’]difuran-1,3,4,6(3aH,3bH,6aH,6bH)-tetraone.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Wu, Qi; Ma, Xiaoru; Zheng, Feng; Lu, Xuemin; Lu, Qinghua published the artcile< Synthesis of highly transparent and heat-resistant polyimides containing bulky pendant moieties>, Application In Synthesis of 4415-87-6, the main research area is transparent heat polyimide bulky pendant moiety.

A new diamine with bulky pendant biphenyl and ortho-position di-Me structures, 4,4′-((1,1′-biphenyl)-4-ylmethylene)bis(2,6-dimethylaniline), was synthesized via a one-pot reaction of 4-biphenyl carboxaldehyde and 2,6-dimethylaniline. The diamine was employed to polymerize with several dianhydrides via one-step condensation under high-temperature conditions. The light yellow or colorless polyimide (PI) films obtained were found to have cut-off wavelengths in the range 286-358 nm and transmittance over 80% in the visible region (400-780 nm). Meanwhile, these PIs possessed excellent solubility in common organic solvents, even in low-boiling-point solvents such as chloroform (CHCl3), dichloromethane (CH2Cl2) and THF. The glass transition temperatures (Tg) of the PIs were determined to exceed 343 °C, even to 456 °C. All PI films were flexible with a tensile strength of 78-119 MPa, a Young’s modulus of 2.0-2.5 GPa and elongation at break of 4.0%-8.2%. Therefore, these colorless PIs can be used as candidate materials for flexible display substrates. © 2019 Society of Chem. Industry.

Polymer International published new progress about Boiling point. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Application In Synthesis of 4415-87-6.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Chen, Chun-Kai; Lin, Yan-Cheng; Hsu, Li-Che; Ho, Jin-Chieh; Ueda, Mitsuru; Chen, Wen-Chang published the artcile< High Performance Biomass-Based Polyimides for Flexible Electronic Applications>, Formula: C8H4O6, the main research area is biomass biodegradable polyimide flexible electronic OFET.

Biobased polymers have received extensive research attention in flexible and renewable electronics to meet the concept of environmental sustainability. In this study, we develop a series of new polyimides (PIs) from biosources to serve as the substrate and dielecs. for a flexible organic field-effect transistor (OFET). The bioderived diamine, (3R,6S)-hexahydrofuro[3,2-b]furan-3,6-diyl bis(4-aminobenzoate) (ISBA), synthesized from isosorbide (ISB), was reacted with three dianhydrides of pyromellitic dianhydride (PMDA), 3,3′,4,4′-biphenyl-tetracarboxylic dianhydride (BPDA), and cyclobutane-1,2,3,4-tetracarboxylic dianhydride (CBDA) to obtain PIs and copolyimides (Co-PIs) with a high biomass content up to 53%. These bioderived PIs possessed high Td’s over 400°C and Tg’s over 250°C. Furthermore, the CBDA-based and PMDA-based PIs exhibited CTE values below 50 ppm K-1 due to the rigid heterocyclic ISB unit and the structural linearity of the CBDA and PMDA moieties in the polymer backbone. High transparency and low coloration were also observed in the biobased PIs. Finally, highly thermal-resistant PI(ISBA-C95B5) consisting of the CBDA/BPDA mole ratio of 95/5 was applied as the substrate and dielecs. in flexible OFET, demonstrating the compatible and stable performance even after being baked at 200°C for 2 h or 1000 bending cycles. The present study reveals the potential application of biobased PIs in electronic devices for a sustainable economy.

ACS Sustainable Chemistry & Engineering published new progress about Biodegradable materials. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Formula: C8H4O6.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem