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首页> 外文期刊>Journal of Applied Polymer Science >Poly(lactic acid) Stereocomplex Formation: Application to PLA Rheological Property Modification
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Poly(lactic acid) Stereocomplex Formation: Application to PLA Rheological Property Modification

机译：聚乳酸立体复合物的形成：在PLA流变性能改性中的应用

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摘要

Poly(lactic acid) (PLA) stereocomplex formation in isothermal conditions in the absence and presence of a nucleating agent was studied from a rheological point of view due to sensitivity of viscoelastic properties to structural changes during this process. PDLA was melt blended in low concentrations with PLLA to produce a stereocomplex. Amorphous samples were prepared and crystallization was carried out in a rheometer at high temperatures to simulate melt processing conditions. Stereocomplexation was explored over time by measuring rheological parameters in small deformation oscillatory shear mode at a low frequency using parallel plate geometry. Kinetic data obtained by this means was compared to data from calorimetric studies, showing a different trend depending on the characterization method. Moreover, after the completion of crystallization, final crystalline structure was probed over a wide range of frequencies to investigate the rheological modification role of PDLA on PLLA major component. Differences in rheological characteristics of asymmetric PLLA/PDLA blends as compared to neat PLLA were associated to the structural changes happening because of the formation of the stereocomplex.
机译：由于流变学的观点，由于粘弹性对过程中结构变化的敏感性，从流变学的角度研究了在等温条件下不存在和存在成核剂的条件下，聚乳酸（PLA）立体复合物的形成。将PDLA与PLLA低浓度熔融共混，以生成立体复合物。制备无定形样品，并在流变仪中在高温下进行结晶以模拟熔体加工条件。通过使用平行板几何结构在低频下以小变形振荡剪切模式测量流变参数来探索立体复杂性。通过这种方法获得的动力学数据与量热研究的数据进行了比较，根据表征方法显示出不同的趋势。此外，结晶完成后，在很宽的频率范围内探测最终的晶体结构，以研究PDLA对PLLA主要成分的流变改性作用。与纯PLLA相比，不对称PLLA / PDLA共混物的流变特性差异与由于立体复合物的形成而引起的结构变化有关。

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