综合考虑聚酯型聚氨酯和聚醚型聚氨酯的特点，以聚乙二醇（PEG）和聚己二酸丁二醇酯（PBAG）混合作为软段，采用溶液预聚法制备了混和软段聚氨酯。考察了混合软段中PEG与PBAG的摩尔分数以及(PEG/PBAG)/BDO/IPDI三者的摩尔分数对聚氨酯薄膜的吸水率、透湿率以及力学性能的影响。结果表明：随着PEG摩尔分数的增大，薄膜的玻璃化转变温度，吸水率和透湿率增大，而最大载荷和断裂伸长率有所下降；随着PEG硬段比例的增加，薄膜的玻璃化转变温度，最大载荷增加明显，而薄膜的吸水率和断裂伸长率有所降低。
关键词：混合软段，聚乙二醇，聚氨酯，透湿性，力学性能
Preparation of mixed soft segment polyurethane
Abstract: Considering polyester polyurethane and polyether polyurethane characteristics of polyethylene glycol (PEG) and polybutylene adipate (PBAG) mixture as a soft segment prepolymer prepared by solution of the mixed softsegment polyurethane.Mixed soft segment was investigated in the mole fraction of PEG and PBAG and (PEG / PBAG) / BDO / IPDI polyurethane three films on the mole fraction of water absorption, moisture permeability and mechanical properties.The results showed that:With the PEG mole fraction, the film's glass transition temperature, water absorption and moisture permeability increase, while the maximum load and elongation at break decreased; with the PEG ratio of hard segment increases, the glass filmtransition temperature, the maximum load increased significantly, while the film of water absorption and elongation at break decreased.
Key words: mixed soft segments, polyethylene glycol, polyurethane, moisture permeability and mechanical properties
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