通过旋转流变仪和热台显微镜研究了超高分子量聚乙烯(UHMWPE)/白油体系在不同升温速率下的溶胀和溶解行为。研究结果表明,在不同的升温速率下,体系的黏度变化趋势大致相同。在升温速率为1℃/min时,体系呈现边熔融边溶胀、随后溶解的现象;升温速率为10℃/min时,由于升温速率较快,树脂结晶区熔融速率过快,在树脂完全熔融之前,几乎观察不到溶胀现象。可将UHWMPE/白油体系的黏度随温度变化分成四个阶段,即溶胀阶段、溶解前期、溶解后期和溶液阶段。最后结合实验现象,提出一个结构变化模型来描述UHMWPE/白油体系在不同升温速率下的溶胀、溶解行为。
The swelling and dissolution behavior of ultra high molecular weight polyethylene (UHMWPE)/Liquid Paraffin (LP) system at different heating rates were studied by rotational rheometer and thermo-stage microscope.The results shown that the viscosity followed the same trend no matter what the heating rate was.When the heating rate was 1℃/min,the system swelled and melted while melting,and then dissolution.When the heating rate was 10℃/min,the melting rate of the resin crystallization zone was fast due to the faster heating rate.Before the resin was completely melted,swelling was hardly observed.the viscosity of the UHWMPE/LP system was divided into four stages with temperature changes:1)swelling stage;2)the early stage of dissolution;3)the late stage of dissolution;4)solution stage.Finally,combined with experimental phenomena,a structure evolution model was proposed to describe the swelling and dissolution behavior of UHMWPE/LP system at different heating rates.
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基金资助
上海市国际科技合作基金项目(16160731301)
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