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讨论以聚乙二醇为亲水软段 ,聚己二酸乙二酯为疏水软段的嵌段型 APU(BAPU)的结构表征及其透湿性能。用调制温度示差扫描量热分析方法研究了 BAPU的玻璃化转变 ,发现具有混合软段 BAPU的玻璃化转变温度和热容增量均介于纯亲水和纯疏水性软段 BAPU的相应值之间 ,透湿性能测定证明 ,BAPU的透湿系数随其亲水性及交联密度显著变化
The structural characterization and moisture permeability of block APU (BAPU) with polyethylene glycol as hydrophilic soft segment and polyethylene adipate as hydrophobic soft segment were discussed. The glass transition of BAPU was studied by differential scanning calorimetry (DSC), and the glass transition temperature and heat capacity increment of BAPU with mixed soft segment were found to be between the corresponding values of pure hydrophilic and pure hydrophobic BAPU Between the moisture permeability test proved that BAPU moisture permeability coefficient with its hydrophilicity and crosslinking density significantly changed