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通过纳米纤维状夹杂物的剪切诱导结晶制备可持续的聚乳酸基纳米复合材料。

generation of sustainable PLA-based nanocomposites by shear induced crystallization of nanofibrillar inclusions.

作者信息

Hosseinnezhad Ramin, Vozniak Iurii, Morawiec Jerzy, Galeski Andrzej, Dutkiewicz Slawomir

机构信息

Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences 90-363 Lodz Poland

Institute of Biopolymers and Chemical Fibers 90-570 Lodz Poland.

出版信息

RSC Adv. 2019 Sep 25;9(52):30370-30380. doi: 10.1039/c9ra05919a. eCollection 2019 Sep 23.

DOI:10.1039/c9ra05919a
PMID:35530229
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9072123/
Abstract

formation of polymer nanofibrils during compounding with a second polymer followed by their immediate solidification due to shear induced crystallization for two pairs of polymers is described. Sustainable green biopolymer-biopolymer nanocomposites of polylactide (PLA) were then fabricated based on two copolyesters forming nanofibrils during shearing: poly(butylene adipate--succinate--glutarate--terephthalate) (PBASGT) and poly(butylene adipate--terephthalate) (PBAT). The shear induced crystallization allowed solidification of PBASGT or PBAT nanofibers immediately under applying a high shear rate without subsequent cooling. The melt memory unveiling as a self-nucleation facilitated shear-induced crystallization. Formation of nanofibril-matrix morphology led to an exceptional combination of strength, modulus and ductility. SEM observation of the tensile test revealed crazing as a dominant mechanism for PLA deformation. However, addition of PBASGT or PBAT resulted in intensified crazing followed by shear banding. Increase of PBASGT or PBAT concentration promoted the brittle-to-ductile transition of the PLA matrix. At the same time, PBAT or PBASGT nanofibers span PLA craze surfaces and at large strain, when PLA craze tufts get broken, they bridge the craze gaps resulting in an increase of both strength and plasticity of PLA.

摘要

描述了在与第二种聚合物共混过程中聚合物纳米纤维的形成，以及由于两对聚合物的剪切诱导结晶而使其立即固化的过程。然后基于两种在剪切过程中形成纳米纤维的共聚酯：聚（丁二酸丁二醇酯-琥珀酸酯-戊二酸酯-对苯二甲酸酯）（PBASGT）和聚（丁二酸丁二醇酯-对苯二甲酸酯）（PBAT），制备了可持续的绿色聚乳酸（PLA）生物聚合物-生物聚合物纳米复合材料。剪切诱导结晶使得PBASGT或PBAT纳米纤维在施加高剪切速率下立即固化，无需后续冷却。熔体记忆表现为自核化促进的剪切诱导结晶。纳米纤维-基体形态的形成导致强度、模量和延展性的优异组合。拉伸试验的扫描电子显微镜观察表明，银纹化是PLA变形的主要机制。然而，添加PBASGT或PBAT会导致银纹化加剧，随后出现剪切带。PBASGT或PBAT浓度的增加促进了PLA基体的脆韧转变。同时，PBAT或PBASGT纳米纤维跨越PLA银纹表面，在大应变下，当PLA银纹簇断裂时，它们会弥合银纹间隙，从而导致PLA的强度和塑性都增加。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e610/9072123/2da221f720c3/c9ra05919a-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e610/9072123/757598f1e6f5/c9ra05919a-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e610/9072123/494dc278f922/c9ra05919a-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e610/9072123/6a8aeca31999/c9ra05919a-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e610/9072123/4b041899977b/c9ra05919a-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e610/9072123/a0b278c4ee6a/c9ra05919a-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e610/9072123/2da221f720c3/c9ra05919a-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e610/9072123/757598f1e6f5/c9ra05919a-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e610/9072123/45b864a7ac78/c9ra05919a-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e610/9072123/c384f1056bda/c9ra05919a-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e610/9072123/62a8937c0e5f/c9ra05919a-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e610/9072123/494dc278f922/c9ra05919a-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e610/9072123/6a8aeca31999/c9ra05919a-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e610/9072123/4b041899977b/c9ra05919a-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e610/9072123/a0b278c4ee6a/c9ra05919a-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e610/9072123/2da221f720c3/c9ra05919a-f9.jpg

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