State Key Laboratory of Polymer Materials Engineering of China (Sichuan University), Polymer Research Institute of Sichuan University, Chengdu 610065, China.
State Key Laboratory of Polymer Materials Engineering of China (Sichuan University), Polymer Research Institute of Sichuan University, Chengdu 610065, China.
J Colloid Interface Sci. 2017 Jul 1;497:290-297. doi: 10.1016/j.jcis.2017.01.076. Epub 2017 Jan 24.
Herein, we report a new approach to fabricate polyvinyl alcohol (PVA) based hydrophilic monoliths by alcoholysis of porous emulsion-templated polyvinyl acetate (PVAc). The precursory PVAc-based monolith is obtained by polymerization of a W/O high internal phase emulsion (HIPE) containing vinyl acetate as the external phase while water as the internal phase. As an alcoholysis-stable tri-functional commonomer, triallyl isocyanurate is chosen as the crosslinking agent to prevent possible collapse of the polymeric skeleton and the consequent losses in mechanical properties during the alcoholysis step. By alcoholysis of the resulting PVAc-based monolith, the PVA-based monoliths are successful prepared as confirmed by FTIR analysis. BET analysis and SEM observation confirm the formation of open-cell and highly interconnected porous structures of PVA-based monoliths with surface areas of around 16m/g. Stemming from the intrinsic hydrophilicity of hydroxyl and morphology, PVA-based monoliths exhibit great enhancement in hydrophilicity with a much lower water contact angles than that of PVAc-based monoliths.
在此，我们报告了一种通过多孔乳液模板聚醋酸乙烯酯（PVAc）的醇解来制备聚乙烯醇（PVA）基亲水整体的新方法。前驱体 PVAc 基整体是通过包含醋酸乙烯酯作为外部相而水作为内部相的 W/O 高内相乳液（HIPE）的聚合获得的。作为一种醇解稳定的三官能共聚单体，三烯丙基异氰脲酸酯被选为交联剂，以防止在醇解步骤中聚合骨架可能坍塌和随后的机械性能损失。通过对所得的 PVAc 基整体进行醇解，成功地制备了 PVA 基整体，这通过 FTIR 分析得到了证实。BET 分析和 SEM 观察证实了 PVA 基整体形成了具有约 16m/g 表面积的开孔和高度互连的多孔结构。由于羟基和形态的固有亲水性，PVA 基整体表现出极大的亲水性增强，其水接触角远低于 PVAc 基整体。
