聚氨酯丙烯酸酯的合成及其对紫外固化医用导电压敏胶性能的影响

以2,4-甲苯二异氰酸酯和不同相对分子质量的聚丙二醇(PPG)为原料,有机铋为催化剂合成了含异氰酸酯端基的聚氨酯,然后用甲基丙烯酸羟乙酯封端得到聚氨酯丙烯酸酯。以聚氨酯丙烯酸酯为大分子交联剂,N,N-亚甲基双丙烯酰胺为小分子交联剂,丙烯酸和丙烯酰胺-2-甲基丙磺酸为单体,用紫外光引发剂引发聚合,在氯化钾(KCl)溶液中固化制得导电压敏胶。采用傅里叶变换红外光谱仪、核磁共振氢谱仪和凝胶渗透色谱仪对聚氨酯丙烯酸酯进行表征。对导电压敏胶的剥离力进行测试发现,当使用质量分数为2.4%的PPG2000软段聚氨酯丙烯酸酯为大分子交联剂时,所得到的导电压敏胶具有最大的剥离力,其导电性能随着KCl含量的增加而增强。生物相容性测试表明该导电压敏胶透气性好,对皮肤没有刺激性,具有临床应用的潜力。

RELIABILITY-BASED SYNTHESIS OF PATH GENERATING LINKAGES

The path generated by a linkage in general deviates from the specified path. In this paper,the deviation is analyzed based upon the reliability concept and a reliability-based optimal synthesisprocedure is presented for path generating mechanisms. Both structural and mechanical errors areincorporated in the objective function. A four-bar path generating mechanism is considered fornumerical illustration and the results are compared with those obtained by deterministic procedure.As expected, the presented approach is superior to the deterministic procedure.