EUROPEAN POLYMER JOURNAL
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2024
·
IF 5.8
Tianyong Zhang,Yamei Chai,Suisui Wang,Jianing Yu,Zihao Fang,Shuang Jiang,Bin Li
With the diminishing gap between the internal components of chips, the signal transmission delay poses a substantial threat to chip performance. To enhance the transmission speed of electrical signals, the development of materials with a low dielectric constant (D k ) becomes imperative. Polyimide (PI), categorized as a specialized engineering material, exhibits a high D k (≥3), posing challenges in meeting the requirements of electronic and communication industries. Consequently, a new diamine monomer named BTVFD, characterized by spirobifluorene and cross-linkable tetrafluorostyrol groups, was synthesized. It was copolymerized with 2,2′-bis(trifluoromethyl)-[1,1′-biphenyl]-4,4′-diamine (TFDB) and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) to synthetize cross-linkable polyimides (TBPIs) with different BTVFD content. The cross-linked TBPIs (CL-TBPIs) were obtained by thermal cross-linking reaction. The study results demonstrate the D k of PIs is significantly reduced through this effective strategy. Notably, CL-TBPI-2 exhibits outstanding comprehensive performance with low D k (1.88@10 MHz) and dielectric loss (0.00513@10 MHz), low water uptake (0.125 %), high thermal decomposition temperature (5 % weight loss at 553 °C) and glass transition temperature (374 °C), excellent tensile strength (121.8 MPa) and nice transparency and flexibility.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2012
·Vol. 4
·期 4
·1107-1114
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IF 5.321
Haiyang Gao,Ying Tang,Zhilong Hu,Qirui Guan,Xinbo Shi,Fangming Zhu,Qing Wu
A tandem synthetic strategy combining chain walking polymerization and azide–alkyne click chemistry was successfully used to prepare amphiphilic copolymers with a dendritic polyethylene core and poly(ethylene oxide) (PEO) arms. Dendritic polyethylene (DPE) tethered with multi-reactive hydroxyl groups (DPE-(OH)11) was synthesized by copolymerization of ethylene and trimethylsilyl-protected 2-hydroxyethyl acrylate using an α-diimine palladium catalyst under low ethylene pressure of 0.1 atm. Alkynyl-terminated DPE (DPE-()11) was quantitatively obtained by esterification reaction of DPE-(OH)11 with pentynoic acid. Using a “grafting to” technique, PEO precursors with a terminated azido group were introduced to the DPE core with high efficiency by azide–alkyne click coupling reaction. The self-assembly behaviors of the obtained core–shell amphiphiles in selective solvents including water and hexane were studied by TEM, AFM and fluorescence. Supramolecular vesicles, unimolecular micelles, and multi-molecular micelles were observed, which is dependent on selective solvent as well as number and chain length of PEO arm.
研究领域:
材料科学
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高分子化学
✓ 已验证
DOI
高影响因子
STAR Protocols
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2022
·
IF 0
Ziman Chen,Yahui Zhang,Qingmei Song,Liang Ma,Yongqin Lv
Summary Mixed-matrix membranes (MMMs) comprising polymer matrices and metal-organic frameworks (MOFs) provide efficient and economic CO 2 separation. One major challenge is to construct continuous and defect-free MMMs due to poor MOF/polymer compatibility. Here, this protocol describes the step-by-step details for synthesis of desired linkers that allow the fabrication of new polymerizable MOFs containing vinyl groups (BUCT MOFs) and the preparation procedures of defect-free MMMs with enhanced MOF/polymer interfacial adhesion and boosted gas separation performances. For complete details on the use and execution of this profile, please refer to Chen et al. (2021) .
研究领域:
材料科学
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化学工程
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膜技术
✓ 已验证
DOI
PubMed
BMC Chemistry
·
2019
·Vol. 13
·期 1
·1-7
·
IF 0
Zhang Xiaoning,Liang Jianwei,Chen Zhenyu,Donley Carrie,Liu Yuling,Cheng Guotao
Natural Bombyx mori silk fibroin (SF) fibers were modified with 2-methacryloyloxyethyl isocyanate (MOI) first for the introduction of vinyl groups. Then, 1H,1H,2H,2H-perfluorodecanethiol was grafted onto the SF fibers via thiol-ene click chemistry using ultraviolet light. The formations of MOI-modified and PFDT-grafted SF fibers were analyzed using Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, respectively. The morphology of samples was also revealed by a scanning electron microscope. In addition, differential scanning calorimetry results demonstrated that SF fibers did not show significant change in thermal behavior, regardless of the chemical modification. To confirm the cytotoxicity of the prepared SF fibers, MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assay was performed, and no toxicity was observed with PFDT-grafted SF fibers. The results also showed that PFDT-grafted SF fibers exhibited good antifouling properties when Chlorella vulgaris (C. vulgaris) was selected as a model for algal cells adhesion experiment.
研究领域:
材料科学
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表面化学
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生物医学工程
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高分子化学
✓ 已验证
产品关联
DOI
PubMed
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