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Fracture behavior and mechanical, thermal, and rheological properties of biodegradable films extruded by flat die and calender
Journal of Polymer Science ( IF 3.4 ) Pub Date : 2020-10-26 , DOI: 10.1002/pol.20200555
Vito Gigante 1 , Laura Aliotta 1 , Maria Beatrice Coltelli 1 , Patrizia Cinelli 1 , Luigi Botta 2 , Francesco Paolo La Mantia 2 , Andrea Lazzeri 1
Affiliation  

The development of biodegradable materials for tailored applications, particularly in the field of polymeric films and sheets, is a challenging technological goal as well as a contribution to help protect the environment. Poly(lactic) acid (PLA) is a promising substitute for several oil‐based polymers; however, to overcome its thermal and mechanical drawbacks, researchers have developed solutions such as blending PLA with polybutylene adipate terephthalate (PBAT), which is capable of increasing the ductility of the final material. In this study, PLA/PBAT binary blends, with minimum possible content of nonrenewable materials, were examined from processing, thermal, morphological, and rheological perspective. An optimized PLA/PBAT ratio was chosen as the polymeric basis to obtain a biodegradable formulation by adding a biobased plasticizer and appropriate fillers to produce a micrometer film with tailored flexibility and tear resistance. The processing technology involved flat‐die extrusion, followed by calendering. The tearing resistance of the produced film was investigated, and the results were compared with literature data. A study on the essential work of fracture was implemented to explore the mode III out‐of‐plane fracture resistance starting from a trouser tear test.

中文翻译:

用平模和压延机挤出的可生物降解薄膜的断裂行为以及机械,热和流变性能

用于定制应用的生物可降解材料的开发,特别是在聚合物薄膜和片材领域,是一项具有挑战性的技术目标,也是有助于保护环境的一项贡献。聚乳酸(PLA)是几种油基聚合物的有前途的替代品。但是,为了克服其热和机械方面的缺陷,研究人员开发了解决方案,例如将PLA与聚己二酸对苯二甲酸丁二醇酯(PBAT)混合,从而能够提高最终材料的延展性。在这项研究中,从加工,热学,形态学和流变学的角度研究了PLA / PBAT二元共混物,其中不可再生材料的含量尽可能低。选择最佳的PLA / PBAT比率作为聚合物基础,通过添加生物基增塑剂和适当的填料来生产具有定制的柔韧性和抗撕裂性的微米级薄膜,从而获得可生物降解的制剂。加工技术涉及平模挤压,然后进行压延。研究制得的膜的抗撕裂性,并将结果与​​文献数据进行比较。从裤子撕裂试验开始,对骨折的基本功进行了研究,以探索III型面外骨折阻力。
更新日期:2020-12-02
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