疏水缔合水凝胶性能及链缠结

Performance and chain entanglement of hydrophobic association hydrogels

中文关键词: 水凝胶  疏水缔合  力学强度  溶胀过冲  链缠结  缠结分子质量

英文关键词: hydrogel  hydrophobic association  mechanical strength  swelling overshoot  chain entanglement  entangled molecular mass

中文摘要:

      为研究凝胶体系的分子链缠结，通过胶束共聚合成不同单体含量组成的疏水缔合水凝胶(HA-gels)．通过拉伸实验及溶胀实验分别测试HA-gels的力学性能及溶胀性能．通过力学及溶胀性能参数计算分子链缠结相关参数，进而利用MATLAB软件通过迭代法计算缠结分子质量．结果表明，HA-gels的力学强度与模量均随单体含量增加而增加，断裂伸长率相应下降．HA-gels的溶胀率随单体含量增加而降低，所有的HA-gels均呈现溶胀过冲现象．将HA-gels干燥后，干凝胶的溶胀率随单体含量增加而下降并出现溶胀过冲现象．HA-gels在水中的质量损失随单体含量增加而降低．适用于任意单体含量的HA-gels及干凝胶的缠结分子质量为Men=15 606φ-0.853 2．

英文摘要:

      In order to study the molecular chain entanglement of hydrogel system, hydrophobic association hydrogels (HA-gels) with different contents of monomers are synthesized by micellar copolymerization. The mechanical performance and swelling performance of HA-gels are tested by tensile test and swelling test respectively. The molecular chain entanglement parameters are calculated by the mechanical and swelling property parameters,and then the entanglement molecular mass is calculated by an iterative method using the MATLAB software. The results show that the mechanical strength and modulus increase and the elongation at break of HA-gels decreases with the increase of the monomer content. The swelling ratio of HA-gels decreases with the increase of the monomer content. All HA-gels present a swelling overshoot appearance. After HA-gels are dried, the swelling ratio of the xerogels decreases with the increase of monomer content and the swelling overshoot phenomenon can also occurs. The mass loss of hydrogels in water decreases with the increase of the monomer content. The entanglement molecular mass of HA-gels and xerogels for any monomer content is Men=15 606φ2-0.853.