Control of nanostructures in epoxy/acrylic block copolymer blends by the in situ generation of functional groups
Control of nanostructures in epoxy/acrylic block copolymer blends by the in situ generation of functional groups
复制标题
通过原位生成官能团控制环氧/丙烯酸嵌段共聚物共混物中的纳米结构
DOI：
10.1038/pj.2017.26
复制
发表时间：
2017
期刊：
影响因子：
2.8
通讯作者：
Hajime Kishi
中科院分区：
文献类型：
--
作者：
Kazuyoshi Yamada;Hajime Kishi
研究了由环氧树脂、芳香胺和PMMA-b-PnBA-b-PMMA三嵌段共聚物（BCP）组成的共混物的相结构，考察了BCP与环氧树脂/芳香胺混合物共混过程的影响。发现BCP在胺中的热溶解促进BCP的PMMA段中羧酸的原位生成。这增强了嵌段共聚物与固化的环氧/芳族胺树脂的相容性，允许嵌段共聚物的自组装以在聚合物基质中形成纳米相结构。这项工作还确定，改变加热条件是控制羧基生成量（即酸值）的有效手段。这种变化导致形成不同类型的胶束结构，如弯曲的层状，蠕虫状胶束和囊泡和球体共存，从环氧/胺/BCP共混物具有相同的组成。
The phase structures obtained from blends consisting of an epoxy resin, an aromatic amine and a PMMA-b-PnBA-b-PMMA triblock copolymer (BCP) were studied, in terms of the effect of the process used to blend the BCP into the epoxy/amine mixture. The thermal dissolution of the BCP in the amine was found to promote the in situ generation of carboxylic acids in the PMMA segments of the BCP. This enhanced the compatibility of the BCP with the cured epoxy/aromatic amine resin, allowing the self-assembly of the BCP to form nanophase structures in the polymeric matrix. This work also determined that modification of the heating conditions was an effective means of controlling the quantity of carboxyl groups generated (that is, the acid value). Such variations led to the formation of different types of micelle structures, such as curved lamellae, coexisting of worm-like micelles and vesicles and spheres, from epoxy/amine/BCP blends having the same composition.