POLYMER INTERNATIONAL
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2020
·Vol. 69
·期 12
·1267-1274
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IF 2.574
Xin Liu,Yanwei Gao,Xuanbo Zhu,Yingshuang Shang,Zengduo Cui,Qixing Yan,Haibo Zhang
Two novel poly(arylene ether sulfone)s with high biphenylene content (BDS-PES and BDS-PDBES) are prepared by nucleophilic substitution polymerization of synthesized 4,4′-bis(4-hydroxyphenyl)diphenyl sulfone (BDS) with 4,4′-sulfonylbis(fluorobenzene) and 4,4-bis[(4-chlorophenyl)sulfonyl], respectively. The prepared polymers show high glass transition temperature and excellent high-temperature mechanical properties. The glass transition temperature of BDS-PDBES with higher biphenylene content is as high as 300 °C, and BDS-PDBES can still maintain its 30% storage modulus at 295 °C. In addition, the two novel polymers also show excellent thermal stability ( T d5 = 526 °C), high elongation at break ( ε ≈ 20%), good tensile strength (73 MPa) and modulus (1.73 GPa) and good thermal conductivity ( λ 300°C = 0.28 W ·m −1 ·K −1 ).
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2014
·Vol. 25
·期 9
·920-926
·
IF 1.964
Cuihong Zhang,Dongrui Wang,Jin He,Tao Liang,Guo-Hua Hu,Zhi-Min Dang
In this work, self-assembly method was used to improve the dielectric constant of triblock copolymers. A series of ABA triblock copolymers with a defined length of poly(n-butyl acrylate) (PBA, B block) segment and different lengths of liquid crystalline (LC) poly[11-(4-cyano-4′-biphenoxy)undecyl methacrylate] (P11CBMA, A block) segments were synthesized by using the atom transfer radical polymerization method. The well-defined triblock copolymers P11CBMA m - b -PBA n - b -P11CBMA m possess three different B/A ratios ( n = 50, m = 17, 43, 53). Due to the supramolecular cooperative motion effect, the copolymers can form worm-like microstructure ( W LC = 52.8%), cylinder-like nanostructure with P11CBMA phase embedded in PBA matrix ( W LC = 73.9%), and wide stripe structure with LC domains distributed unevenly in a continuous PBA matrix ( W LC = 77.7%) after annealed at 160°C (above T i ) under N 2 for 24 h, respectively. In order to study the influence of microphase separated morphology of triblock copolymer on the dielectric properties, solvent annealing was also used to develop various nanostructures. After thermal or solvent annealing, the dielectric constants of block copolymers increased dramatically while their loss factors remained the same. For different block copolymers, the dielectric constants increased with the increase of the LC block length. For diverse treatments, dielectric permittivities of samples varied widely with different nanostructures. The results show that the dielectric constants of block copolymers could be tuned by the block ratios and the self-assembled microstructures. These findings will inspire researchers using self-assembly method to design and develop novel flexible materials with high dielectric permittivity. Copyright © 2014 John Wiley & Sons, Ltd.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
ORGANIC ELECTRONICS
·
2014
·
IF 3.676
Chunyu Zhang,Zhanchen Cui,He Wang,Donghang Yan,Yao Li,Zuosen Shi,Aihua Wu,Zhuo Zhao,Shengji Luan
Novel polyurethane containing terphenyl groups were designed and synthesized as gate insulators to induce the crystallization of p-sexiphenyl(p-6P) for organic thin-film transistors (OTFTs). Different sizes and shapes of p-6P grains were measured by atomic force microscopy (AFM), and results showed that the large size of p-6P grain can improve the performance of OTFTs. About 900 nm thick films can be easily fabricated by spin-coating under ambient conditions, followed by curing at UV irradiation for 10 min. OTFTs with this film as gate insulator were found to have good processability, a high charge-carrier mobility of 1.1 cm 2 /V s, a threshold voltage of −25 V, and an on/off current ratio >10 5 . The result indicated that this material is a promising candidate for the exploration of devices using OTFTs.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Jie Zhang,Qian Liu,Zijian Li,Guanwen Huang,Hailong Li,Xiuchen Li,Shouhai Zhang,Xigao Jian
The enhancement of thermal resistance and mechanical properties for the soluble poly(aryl ether ketone)s is an important research topic. Based on the idea of introducing twisted N-heterocyclic structure and utilizing the restriction of intramolecular chain rotation by bulky pendant groups, the thermo-resistance, mechanical properties, and surface properties of polymers are modulated while ensuring their solubility. A novel bisphenol-like monomer 1′,4-di(biphenyl)-6,6′-biphthalazin-1,4(2H,3H)-dione (DBBD) and corresponding N-heterocycle copoly (aryl ether ketone)s with pendant biphenyl groups (PDPEKs) are prepared. PDPEKs exhibit good thermal stability in air and nitrogen, and the glass transition temperature ( T g ) is in the range of 288–347 °C. In addition, the storage modulus retention rate of PDPEKs reaches 60.6 % at 250 °C. PDPEKs exhibit good solubility in N-methylpyrrolidone and 1,1,2,2-tetrachloroethane, performing good film-formation properties. The tensile strength of PDPEKs films is between 102 and 121 MPa, the Young's modulus is between 2.01–2.30 GPa, and the water contact angle of PDPEKs is in the range of 79°–84°.
研究领域:
高分子科学
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材料科学
·
化学工程
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高影响因子
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