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首页> 外文期刊>Journal of thermal analysis and calorimetry >Thermal behavior of isotactic polypropylene in different content of beta-nucleating agent
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Thermal behavior of isotactic polypropylene in different content of beta-nucleating agent

机译:等规聚丙烯在不同含量β成核剂中的热行为

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摘要

The effects of non-isothermal and isothermal crystallization on the formation of alpha- and beta-phase in isotactic polypropylene (iPP) with different content of beta-nucleating agent are investigated by differential scanning calorimetry (DSC). On non-isothermal crystallization, the content of beta-phase and regularity of its crystals are depended on both cooling rate and the content of beta-nucleating agent. The faster cooling rate is, the lower of melting peak temperature (T-mp) and crystallization peak temperature (T-cp) of alpha- and beta-phase are. The enthalpy of fusion (a dagger H) of beta-phase increases with cooling rate in a certain range for the sample with 0.1 wt beta-nucleating agent (G(1)) and decreases for that with 0.3 wt beta-nucleating agent (G(3)). On isothermal crystallization, the enthalpy of fusion of beta-phase in G(1) is higher than in G(3) which is related to the efficiency of nucleation in different concentration of nucleating center in two samples.
机译:采用差示扫描量热法(DSC)研究了非等温和等温结晶对不同β成核剂含量的等立构聚丙烯(iPP)中α相和β相形成的影响。在非等温结晶中,β相的含量及其晶体的规律性取决于冷却速率和β成核剂的含量。冷却速度越快,α相和β相的熔化峰温度(T-mp)和结晶峰温度(T-cp)越低。对于含有 0.1 wt% β 成核剂 (G(1)) 的样品,β 相的熔融焓(匕首 H)在一定范围内随冷却速率的增加而增加,而对于含有 0.3 wt% β 成核剂 (G(3)) 的样品,β 相的熔融焓(匕首 H)随着冷却速率的增加而增加。在等温结晶中,G(1)中β相的熔化焓高于G(3),这与两个样品中不同浓度的成核中心成核效率有关。

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