不同介质中可电离两亲嵌段共聚物对石墨烯片的胶体稳定作用
Colloidal stabilization of graphene sheets by ionizable amphiphilic block copolymers in various media
摘要：
在这项工作中，线性聚苯乙烯-聚（2-乙烯基吡啶）（PS-b-P2 VP）和杂臂星形PS_22P2VP_22可电离嵌段共聚物被用作分散剂的原始石墨烯的液相剥离。各种策略，如直接剥离，薄膜水合和相转移已被采用和比较。最好的策略涉及一个两步的过程，即，预剥离的石墨在聚合物/CHCl 3的解决方案，然后相转移到酸化水。然后通过使用星形共聚物作为稳定剂获得高度富集单层结构的石墨烯薄片的高浓度稳定水性悬浮液。所制备的石墨烯/共聚物杂化物被用作填料材料，以制备用于机械增强的功能聚合物复合材料。这种共聚物改性的石墨烯片已被证明是PVA的有效增强剂，因为即使在0.1重量%的低石墨烯重量分数下也实现了储能模量的显著增加（比纯PVA的储能模量高145%）。
英文摘要：
In this work, linear polystyrene-poly(2-vinylpyridine) (PS-b-P2VP) and heteroarm star PS_22P2VP_22 ionizable block copolymers were used as dispersing agents for the liquid-phase exfoliation of pristine graphene. Various strategies such as direct exfoliation, film hydration and phase transfer have been employed and compared. The best strategy involved a two-step process, namely, pre-exfoliation of graphite in polymer/CHCl3 solutions followed by phase transfer to acidified water. High concentrations of stable aqueous suspensions of graphene flakes, highly enriched in monolayer structures, were then obtained by using the star-shaped copolymers as stabilizers. The as-prepared graphene/copolymer hybrids were used as a filler material in order to prepare functional polymer composites for mechanical reinforcement. Such copolymer-modified graphene sheets have proven to be efficient reinforcing agents of PVA, as a significant increase of storage modulus (145% higher than that of neat PVA) was achieved even at a low graphene weight fraction of 0.1 wt%.
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