摘要
以刚性疏水单体苯乙烯(St)与亲水性单体甲基丙烯酸-β-羟乙酯(HEMA)共聚,分别以双甲基丙烯酸乙二醇酯(EDMA)和二乙烯基苯(DVB)为交联剂,采用本体聚合的方法合成了5个系列的水凝胶材料.研究了St含量以及交联剂的类型和用量对水凝胶溶胀、拉伸性能以及网络结构参数的影响.结果表明:St含量或交联剂用量增大,均导致水凝胶中平衡水质量分数降低,聚合物体积分数增大,有效交联密度增大,网链摩尔质量减小,聚合物-水相互作用参数增大;反映在宏观上是拉伸强度和杨氏模量的增大.在HEMA70/St30水凝胶体系中EDMA和DVB有着相近的交联效率.
<Abstrcat> Five series of hydrogels based on the rigid hydrophobic monomer styrene (St) and the hydrophilic monomer 2-hydroxyethyl methacrylate (HEMA) crosslinked with ethylene dimethacrylate (EDMA) or divinyl benzene (DVB) were synthesized by bulk polymerization. Effects of St content and the type and content of crosslinker on swelling behaviors, tensile properties, effective crosslink density (v_e), molar mass between cross-links (M_C) and polymer-water interaction parameter (χ) of hydrogels were studied. It has been shown that the increase of styrene or crosslinker content in polymerization would lead to changes of swelling behavior, network structure and polymer-water interaction in hydrogels, viz. the decrease of equilibrium water content (w_1) and M_C values the increase of volume fraction of polymer in hydrogel (φ_2), v_e and χ values. These changes represent macroscopically the increase of tensile strength and Young's modulus of the hydrogels. EDMA and DVB have similar crosslinking efficiency in the HEMA70/St30 system.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2005年第6期551-555,559,共6页
Transactions of Beijing Institute of Technology
关键词
水凝胶
溶胀性能
拉伸性能
有效交联密度
相互作用参数
交联效率
hydrogels
swelling behavior
tensile properties
effective crosslinking density
interaction parameter
crosslinking efficiency