首页> 外文会议>International Conference on Deformation, Yield and Fracture of Polymers; 20000410-20040413; Cambridge; GB >Time, Deformation and Fracture in Dependence in Dibenzyl Casting Polyurethane Elastomers
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Time, Deformation and Fracture in Dependence in Dibenzyl Casting Polyurethane Elastomers

机译:时间,变形和断裂取决于二苄基铸造聚氨酯弹性体

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Post curing of PU sheets up to 6 mm thickness synthesised with a small -NCO groups excess, (up to I = 110), proceeds at room temperature mainly with the assistance of atmosphere humidity during about one month. The rate of the process as well as the final mechanical properties depend on the thickness of PU sheets. The course of the post cure process depends on the competition between the urea and the allophanate group formation. Due to the low mobility of the chain, the appearance of the urea groups is possible only if the free -NCO groups are pre-segregated in the narrow regions of the hard segments.
机译:PU片材的后固化工艺主要在大气湿度的帮助下进行,约有一个月的时间,主要是在大气湿度的帮助下,在室温下进行厚度达6 mm的合成,并带有少量的-NCO过量基团(最大I = 110)。加工速度以及最终的机械性能取决于PU板的厚度。后固化过程的过程取决于尿素和脲基甲酸酯基团形成之间的竞争。由于链的低迁移率,仅当游离的-NCO基团预分离在硬链段的狭窄区域中时,脲基团才可能出现。

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