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首页> 外文期刊>Journal of Polymers and the Environment >Modification of Poly(Lactic Acid) Rheological Properties Using Ethylene-Vinyl Acetate Copolymer
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Modification of Poly(Lactic Acid) Rheological Properties Using Ethylene-Vinyl Acetate Copolymer

机译：使用乙烯 - 乙酸乙烯酯共聚物改性聚（乳酸）流变性能

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摘要

The effect of ethylene-vinyl acetate copolymer (EVA) addition on the rheological properties of poly(lactic acid) (PLA) was studied. EVA exhibited strain-hardening behavior in the transient elongational viscosity due to its long-chain branch structure, whereas PLA did not show any strain-hardening. The blends showed sea-island structure, in which the size of EVA droplets decreased with the vinyl acetate content in EVA. It should be noted that the blends showed strain-hardening behavior even though EVA is not in the continuous phase. During elongational flow, EVA droplets deform to the fibrous shape owing to hydrodynamic force applied by the matrix PLA, and eventually their deformation is greatly reduced as a result of the strain-hardening. Consequently, the blend system behaved like a rigid-fiber dispersion, which are known to show enhanced elongational viscosity. Finally, the processability of a tubular-blown film was improved by the EVA addition because of the strain-hardening.
机译：研究了乙烯 - 乙酸乙烯酯共聚物（EVA）对聚（乳酸）（PLA）流变性质的影响。由于其长链分支结构，EVA在短暂的伸长粘度下表现出应变硬化行为，而PLA没有显示任何应变硬化。混合物显示海岛结构，其中EVA液滴的尺寸随EVA中的乙酸乙烯酯含量降低。应该注意的是，即使EVA不在连续相中，共混物也表现出应变硬化行为。在伸缩流动期间，由于基质PLA施加的流体动力学力，EVA液滴使纤维形状变形，并且由于应变硬化，它们的变形大大降低。因此，混合系统表现得像刚性纤维分散体一样，已知为增强的伸长粘度。最后，由于应变硬化，通过EVA加入改善管状吹膜的可加工性。

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