聚己酸内酯二醇软段相对分子质量对聚己内酯型聚氨酯弹性体性能的影响

Effect of Poly(ε-Caprolactone) Glycol Soft Segment Relative Molecular Mass on Properties of Polyurethane Elastomer Based on Poly(ε-Caprolactone) Glycol

用ε-己内酯单体开环聚合制取了 3种不同相对分子质量的聚己酸内酯二醇(PCL);PCL 与2,4-甲苯二异氰酸酯、3,5-二甲硫基甲苯二胺采用两步法制备了一系列浇注型聚已内酯型聚氨酯弹性体(CPUE)。采用电子万能试验机、示差扫描量热、动态热机械和可见分光光度计等手段对 CPUE 的静态/动态力学性能及光学性能进行了表征。表征结果显示,PCL 软段的相对分子质量对 CPUE 的性能有较大的影响,PCL 软段相对分子质量低的 CPUE 表现出更多的塑料刚性;随 PCL 软段相对分子质量的增大,CPUE 的硬度、模量、拉伸强度和撕裂强度均大幅下降,但回弹性有很大提高;PCL 软段相对分子质量的增大,导致 PCL 软段结晶,提高了内耗,降低了 CPUE 的透光率。

Three kinds of poly （ε-caprolactone） glycols with different relative molecular mass were synthesized from ε-caprolactone monomer by ring-opening polymerization. A series of casting poly （ ε- caprolactone） urethane elastomers （CPUE）were produced with toluene diisocyanate and dimethythiotoluene diamine by two-stage process and characterized by means of electronic universal testing machine, differential scanning calorimeter, dynamic thermal mechanical instntments and visible spectrophotometer. Relative molecular mass of poly （ε-caprolactone） glycol soft segment affects properties of CPUE noticeably. CPUE with lower relative molecular mass of poly （ε-caprolactone） glycols soft segment shows more plastic-like stiffness. Hardness, modulus, tensile and tear strength of CPUE decrease significantly with increase of poly （ε-caprolactone） glycols soft segment relative molecular mass, but resilient properties improve greatly. The crystallization of poly （ε-caprolactone） glycols soft segments results in higher heat build-up and lower light transmittance.