Poly(hydroxyether of bisphenol A)-block-polydimethylsiloxane alternating block copolymer and its nanostructured blends with epoxy resin
Poly(hydroxyether of bisphenol A)-block-polydimethylsiloxane alternating block copolymer and its nanostructured blends with epoxy resin
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DOI：
10.1016/j.polymer.2008.05.032
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发表时间：
2008-07-07
期刊：
影响因子：
4.6
通讯作者：
Zheng, Sixun
中科院分区：
文献类型：
--
作者：
Gong, Wei;Zeng, Ke;Zheng, Sixun
利用Mannich缩合反应合成了双酚A羟基醚-聚二甲基硅氧烷交替嵌段共聚物（PH-alt-PDMS）。酚羟基封端的低聚（双酚A的羟基醚）和具有限定长度的氨基封端的低聚二甲基硅氧烷之间的聚合是通过形成苯并恶嗪环键来进行的，这是以多聚甲醛为介导的。采用傅里叶变换红外光谱（FTIR）、核磁共振谱（NMR）和凝胶渗透色谱（GPC）对交替嵌段共聚物进行了表征。将嵌段共聚物引入到纳米结构的热固性共混物中。用原子力显微镜（AFM）和小角X射线散射（SAXS）研究了热固性共混物的纳米结构。在热固性复合材料中的纳米结构的形成被判断为遵循自组装机制在固化反应前后的PDMS和PH子链与环氧树脂的相容性的差异。通过应力场强度因子（K-IC）的测量，评价了纳米结构共混物的断裂韧性。应注意，环氧树脂显著增韧。(C)2008爱思唯尔有限公司保留所有权利。
Mannich condensation was utilized to synthesize poly(hydroxyether of bisphenol A)-block-polydimethylsiloxane alternating block copolymer (PH-alt-PDMS). The polymerization between the phenolic hydroxyl-terminated oligo(hydroxyether of bisphenol A) and amino-terminated oligodimethylsiloxane with the defined lengths was carried out via the formation of benzoxazine ring linkages, which was mediated with paraformaldehyde. The alternating block copolymer was characterized by means of Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR) and gel permeation chromatography (GPC). The block copolymer was incorporated to prepare nanostructured thermosetting blends. The nanostructures of the thermosetting blends were investigated by means of atomic force microscopy (AFM) and small angle X-ray scattering (SAXS). The formation of the nanostructures in the thermosetting composites was judged to follow the self-assembly mechanism in terms of the difference in miscibility of PDMS and PH subchains with epoxy resin after and before curing reaction. The fracture toughness of the nanostructured blends was evaluated in terms of the measurement of stress field intensity factor (K-IC). It is noted that the epoxy resin was significantly toughened. (C) 2008 Elsevier Ltd. All rights reserved.