Dai Zhao, Sun Xiu-Xue, Zhang Ji-Mei, Li Ping, Xu Shi-Chao, Liu Yang, Yang Yan-Min, Zheng Guo
State Key Laboratory of Hollow Fiber Membrane Materials and Processes, School of Environmental and Chemical Engineering, Tianjin Polytechnic University, 300160 Tianjin, PR China.
J Nanosci Nanotechnol. 2011 Dec;11(12):11167-70. doi: 10.1166/jnn.2011.4041.
A quantitative research of microspheres, poly(ethylene glycol dimethacrylate-co-acrylic acid) (P(EGDMA-co-AA)) and poly(divinvlbenzene-80-co-acrylic acid) (P(DVB-co-AA)), with active carboxyl groups on surface prepared by distillation-precipitation polymerization was presented in this paper. The loading capacity of active carboxyl group on microspheres which was investigated by titration technique would be increased and the contact angle was decreased following the increase of the feed ratio of acrylic acid (AA) monomer. This phenomenon indicated that the hydrophilicity of particles was mainly determined by the feed ration of hydrophilic AA monomer. However, when the AA fraction was at a fixed level, a slight difference of the loading capacity of carboxyl groups on microsphere surfaces with different crosslinkers existed. The microspheres with EGDMA as crosslinker had a higher loading capacity of carboxyl groups and lower contact angle than those of P(DVB-co-AA) microspheres, which indicated that P(EGDMA-co-AA) microspheres were more hydrophilic than P(DVB-co-AA) microspheres.
本文介绍了通过蒸馏沉淀聚合法制备的表面带有活性羧基的微球、聚（乙二醇二甲基丙烯酸酯 - 共 - 丙烯酸）（P(EGDMA - co - AA)）和聚（二乙烯基苯 - 80 - 共 - 丙烯酸）（P(DVB - co - AA)）的定量研究。通过滴定技术研究发现，随着丙烯酸（AA）单体进料比的增加，微球上活性羧基的负载量增加，接触角减小。这一现象表明颗粒的亲水性主要由亲水性AA单体的进料比决定。然而，当AA分数处于固定水平时，不同交联剂的微球表面羧基负载量存在细微差异。以EGDMA为交联剂的微球比P(DVB - co - AA)微球具有更高的羧基负载量和更低的接触角，这表明P(EGDMA - co - AA)微球比P(DVB - co - AA)微球更亲水。
