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聚丙烯酸凝胶的动态行为及温敏相变
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研究论文 | 更新时间:2021-03-19

摘要

应用动态光散射技术研究了聚丙烯酸凝胶的动态行为及温敏相变.以相关长度(ξ)及扩散系数(D)表征动态行为.交联度

聚合物浓度及引发剂用量对ξ和D影响的规律是

随交联度增加

ξ和D分别减小及增大;聚合物浓度高

扩散系数大;引发剂用量增大

ξ向变小的方向发展.温敏相变的规律是

随温度升高

D增加

ξ下降

并且ξ分布范围逐渐变窄;随温度下降

因χ-诱发的微脱水收缩作用而导致相分离

出现浊度;交联度愈高

出现相分离的温度愈高.

Abstract

Dynamic behavior and phase separation sensitive to temperature of a series of polyacrylic gels were studied by dynamic light scattering. The dynamic behavior of the gels is characterized in terms of the correlation length ξ and diffusion coefficient D. The rules of the influence of cross-linking degree

concentration of polymer and amount of initiator on and D were obtained. When cross-linking degree increases

decreases and D increases

respectively

and there are different scaling relationships under lower or higher cross-linking degree. There is also a scaling relationship between the diffusion coefficient and the concentration of polymer. The higher the concentration

the larger the diffusion coefficient.When the amount of initiator increases

ξtends to be small. And the rules of the phase separation sensitive to temperature for the gels are as follows. When temperature increasesgradually the cooperation diffusion coefficient D increases

the mesh size ξdecreases

the distribution of ξtends to narrow. When temperature decreases gradually

the solvent gets poorer

so phase separation takes places for Х-induced microsyneresis

thus turbidity of the gel appears. Furthermore

the higher the degree of cross-linking

the higher the temperature of phase separation.

关键词

动态光散射 聚丙烯酸凝胶 温敏相变

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