Dynamic Rheological Behavior and Morphology of Polylactide/Poly(butylenes adipate-co-terephthalate) Blends with Various Composition Ratios
Dynamic Rheological Behavior and Morphology of Polylactide/Poly(butylenes adipate-co-terephthalate) Blends with Various Composition Ratios
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DOI：
10.1002/adv.20212
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发表时间：
2011-06-01
影响因子：
3.1
通讯作者：
Huang, Han-Xiong
中科院分区：
文献类型：
--
作者：
Li, Ke;Peng, Jun;Huang, Han-Xiong
使用双螺杆挤出机通过熔融共混制备了不同组成比的聚丙交酯（PLA）/聚己二酸-对苯二甲酸丁二醇酯（PBAT）共混物。分别使用平行板流变仪和扫描电子显微镜（SEM）研究了共混物的动态流变行为和形态。结果表明，随着PBAT含量的增加，共混物的剪切稀化趋势增强。此外，在低频下，PBAT 含量为 20 wt% 的共混物的复数粘度、储能模量和损耗模量高于 PBAT 含量低于 50 wt% 时的其他样品。根据 SEM 图像，随着 PBAT 含量从 5 wt% 增加到 50 wt%，观察到三种不同的形态：球形液滴、细长纤维结构和共连续结构。当PBAT含量达到70 wt%及以上时，形态再次变成液滴，PLA液滴分散在PBAT基质内。此外，尽管组成比相同，但 PBAT/PLA (80/20 w/w) 共混物中的 PLA 液滴比 PLA/PBAT (80/20 w/w) 共混物中的 PBAT 液滴更小且更规则。 (C) 2011 年 Wiley 期刊公司 Adv Polym Techn 30：150-157，2011 年；请访问 wileyonlinelibrary.com 在线查看本文。 DOI 10.1002/adv.20212
Polylactide (PLA)/poly(butylenes adipate-co-terephthalate) (PBAT) blends with various composition ratios were prepared via melt compounding using a twin-screw extruder. The dynamic rheological behavior and morphology of the blends were studied using a parallel-plate rheometer and a scanning electron microscope (SEM), respectively. The results showed that the shear-thinning tendency of blends became stronger with increasing PBAT content. Moreover, at low frequencies, the complex viscosity, storage modulus and loss modulus for blends with 20 wt% PBAT content were higher than that of other samples when PBAT content was less than 50 wt%. Based on SEM images, three distinct morphologies-spherical droplet, elongated fibrous structure, and co-continuous structure-were observed as the content of PBAT increased from 5 to 50 wt%. When the PBAT content reached 70 wt% and above, the morphology became droplets again, with PLA droplets dispersing within the PBAT matrix. In addition, the PLA droplets in the PBAT/PLA (80/20 w/w) blend were smaller and more regular than the PBAT droplets in the PLA/PBAT (80/20 w/w) blend, despite the same composition ratio. (C) 2011 Wiley Periodicals, Inc. Adv Polym Techn 30: 150-157, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/adv.20212