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合成了交联的聚乙烯基吡咯烷酮水凝胶 ,考察了凝胶在注射前和经WN12号针 (直径 1.18mm)注射后的粘弹性。注射前 ,所有试样表现出交联网络的特征 ,即G′ >G″且对ω的斜率接近零 ,并且随交联剂用量降低 ,储存模量和回弹性减小。注射后 ,部分试样模量急剧减小 ;未加交联剂的试样粘弹性保持不变 ;仅有样品B8注射后网络结构破坏较小 ,粘弹性变化很小且保持了注射前良好的回弹性 ,比其他各样品更适宜用作人工玻璃体
The crosslinked polyvinylpyrrolidone hydrogels were synthesized and the viscoelasticity of the gel before injection and after injection of WN12 needle (diameter 1.18 mm) was investigated. Before injection, all the samples showed the characteristics of cross-linked network, ie, G ’> G "and the slope of ω was close to zero, and the storage modulus and resilience decreased with the decrease of the amount of cross-linking agent. The sample modulus decreased sharply; the viscoelasticity of the sample without cross-linking agent remained the same; only the network structure damage of sample B8 after injection was small, the change of viscoelasticity was small and the good resilience before injection was maintained, Each sample is more suitable for use as an artificial vitreous body