【摘要】 <正> 热塑性聚氨酯弹性体是一种包含有软、硕段的多嵌段聚合物,有关其结构与性质的研究已有很多报道,但对它的透气性质研究尚少.McBride和 Knight 等曾对不同硬段含量、不同扩链剂的聚氨酯透气性质作过研究.本工作着重研究不同软段结构和软段长度对聚氨酯透气性的影响,以及含混合软段的聚氨酯的透气性.更多还原

【Abstract】 The permeability coefficient(P_)of polyurethane(PU)with polybutylene adipate(PBA) or polypropylene glycol(PPG)as soft segment has been investigated.Both the types and length of the soft segment have great effect upon the gas permeability.PU with PPG seg- ment shows higher gas permeability than that with PBA segment,Increasing the soft seg- ment length brings about an increase in gas permeability and a decrease in the apparent activation energy. The linear relationship between P_ and the composition of the mixed soft segments indicates that the permeability coefficients of PU with PBA and PPG as soft segment are additive.更多还原