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摘要
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。
Abstract
Polyurethane acrylate (PUA) prepolymers capped with hydroxyethyl methacrylate were synthesized with a diisocyanate (2,4 toluene diisocyanate) and polypropylene glycols with various molecular weight (PPG400,PPG1000,PPG2000 and PPG4000) in toluene under 50℃ with nitrogen protection,using organic bismuth as catalyst.Conductive pressure sensitive adhesives were prepared by mixing the macro-crosslinker PUA,reactive diluents AAc and AMPS,low molecular weight crossinker MBA,photo-initiator BDK and ionic conducting reagent KCl together,followed by exposing to UV light for polymerization.The result of peel strength of the pressure sensitive adhesives showed that the maximum peel force could be obtained when the macro-crosslinker was PPG2000-TDI-HEMA in 2.4wt%.The electrical conductivity was found to be enhanced with increasing the weight percentage of sodium chloride.The pressure sensitive adhesives had potential to be used in clinic.
关键词
聚氨酯丙烯酸酯
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紫外固化
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导电压敏胶
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剥离性能
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生物相容性
Key words
polyurethane acrylate
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UV polymerization
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conductive pressure sensitive adhesive
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peeling property
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biocompatibility
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[J].
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