Rheological and thermal properties of polypropylene blends based in a low molecular weight EVA,Journal of Applied Polymer Science

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Rheological and thermal properties of polypropylene blends based in a low molecular weight EVA
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-11-23 , DOI: 10.1002/app.50288
Aníbal G. Ferrofino ₁ , Marcelo D. Failla _{1,

2} , Lidia M. Quinzani _{1,

3}

Affiliation

Blends of polypropylene (PP) and poly(ethylene‐co‐vinyl acetate) (EVA) having a PP/EVA viscosity ratio of 240 were prepared by melt mixing. EVA concentration varies from 2 to 26 wt%. All blends display two‐phase structure with quasi‐spherical EVA domains evenly distributed in the PP matrix. The diameter of the domains increases with EVA concentration from about 0.4 to 6 μm. Each component crystallizes separately. The melting temperature of PP phase is no noticeably affected by the presence of EVA while the crystallization one gradually increases by 4°C. The dynamic moduli of the blends are well predicted by the emulsion model of Palierne, revealing that the system PP/EVA has a very small interfacial tension. The thermal degradation behavior of the blends, determined by thermogravimetry, shows that the deacylation process in EVA is not affected by the presence of PP while the beginning of the degradation process of PP is increased by up to 20°C due to the presence of EVA. This effect goes along with an increment in the maximum degradation rate of PP.

中文翻译：

基于低分子量EVA的聚丙烯共混物的流变和热性能

通过熔融混合制备PP / EVA粘度比为240的聚丙烯（PP）和聚（乙烯-乙酸乙烯酯）（EVA）的共混物。EVA浓度为2至26重量％。所有共混物均显示两相结构，其中准球形EVA域均匀分布在PP基质中。随着EVA浓度从约0.4μm至6μm，畴的直径增加。每种成分分别结晶。PP相的熔融温度不受EVA的影响，而结晶温度则逐渐升高4°C。共混物的动态模量可以通过Palierne的乳液模型很好地预测，这表明PP / EVA体系的界面张力很小。共混物的热降解行为，通过热重法测定，结果表明，EVA的脱酰过程不受PP的存在的影响，而PP的降解过程的开始由于EVA的存在而增加了高达20°C。这种效果与PP的最大降解率增加有关。

更新日期：2021-02-01

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