Abstract

Polypropylene (PP) mixtures (10 wt %) with AgJ, V₂0₃, AgNO₃, phenolic red, and phenolphthalein underwent plastic deformation at a pressure of 1 GPa on an anvil-type high-pressure device. It has been established by the DSC method that the enthalpy of PP melting in mixtures with inorganic components increased to 310 and 1840 J/g, while the enthalpy of melting was 62 J g^–1 in the initial PP. In the deformed mixture with AgNO₃, melting was described by a superposition of six endothermic peaks. The enthalpy of PP crystallization from the melt in mixtures with ionic crystals (AgJ, AgNO₃) attained 360 and 264 J/g, respectively. Thermograms of mixtures with phenolic red and phenolphthalein showed superpositions of endothermic melting peaks of small polymer crystallites and exothermic peaks of cold crystallization. The enthalpies of endothermic processes in the deformed mixtures with phenolic red and phenolphthalein were identical. In these mixtures, the enthalpies of PP crystallization from the melt were identical to those of cold crystallization.

中文翻译：

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聚丙烯与一些低分子量化合物在高压下塑性变形后的熔融结晶

摘要

聚丙烯 (PP) 混合物 (10 wt%) 与 AgJ、V ₂ 0 ₃、AgNO ₃、酚红和酚酞在砧型高压装置上在 1 GPa 的压力下发生塑性变形。DSC 方法已确定 PP 在与无机组分的混合物中的熔化焓增加到 310 和 1840 J/g，而初始 PP的熔化焓为 62 J g ^–1。在与 AgNO ₃的变形混合物中，熔化由六个吸热峰的叠加描述。PP 从熔体中与离子晶体 (AgJ, AgNO _{3) 的}混合物结晶的焓) 分别达到 360 和 264 J/g。酚红和酚酞混合物的热谱图显示小聚合物微晶的吸热熔融峰和冷结晶放热峰的叠加。酚红和酚酞的变形混合物中吸热过程的焓是相同的。在这些混合物中，PP 从熔体中结晶的焓与冷结晶的焓相同。