Self-assembly of amphiphilic poly(2-hydroxyethyl methacrylate)-containing block copolymers in the vicinity of cellulose fibres
Self-assembly of amphiphilic poly(2-hydroxyethyl methacrylate)-containing block copolymers in the vicinity of cellulose fibres
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DOI：
10.1016/j.eurpolymj.2020.110059
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发表时间：
2020-12
影响因子：
6
通讯作者：
Martina Plank;F. Hartmann;B. Kuttich;T. Kraus;M. Gallei
中科院分区：
文献类型：
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作者：
Martina Plank;F. Hartmann;B. Kuttich;T. Kraus;M. Gallei
在这项工作中，定义明确的聚苯乙烯-嵌段-聚（2-羟乙基甲基丙烯酸酯）（PS-b-PHEMA）和一个非极性模型嵌段共聚物（BCP）聚苯乙烯-嵌段-聚丁二烯（PS-b-PB）已通过顺序阴离子聚合制备，并就其在纤维素纤维存在下的微相分离的能力进行了研究。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）和小角X射线散射（SAXS）测量，研究了纤维素纤维在本体状态下的原始形态以及纤维素纤维附近的微相分离结构。BCP系列的摩尔质量低于70 kg mol− 1，摩尔质量高达201 kg mol− 1，已经进行了溶剂浇铸和随后的热退火，以阐明在存在或不存在具有规定含量的水的纤维素纤维的情况下的微观结构。除了经典的形态，包括球体，圆柱体和层状，也回旋和螺旋域观察。此外，一个显着的影响的程度上的域的顺序和取向被发现为PHEMA含BCP的纤维素纤维和相应的PHEMA块段的羟基部分的相互作用的基础上。
Within this work, well-defined polystyrene-block-poly(2-hydroxyethyl methacrylate) (PS-b-PHEMA) and a non-polar model block copolymer (BCP) polystyrene-block-polybutadiene (PS-b-PB) have been prepared via sequential anionic polymerization and investigated with respect to their capability of microphase separation in the presence of cellulose fibres. Both the original morphologies in the bulk state as well as the microphase-separated structures in the vicinity of cellulose fibres were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS) measurements. BCP series featuring molar masses below 70 kg mol−1and higher molar masses up to 201 kg mol−1have been subjected to solvent-casting and subsequent thermal annealing to elucidate the microstructures in the presence or absence of cellulose fibres with defined contents of water. Besides the classical morphologies comprising spheres, cylinders and lamellae, also gyroidal and helical-domains were observed. Moreover, a significant impact on the degree of domain order and orientation was found for the PHEMA-containing BCPs based on the hydroxyl moiety interactions of the cellulose fibres and respective PHEMA block segments.