聚乳酸/埃洛石纳米黏土/聚四氟乙烯复合泡沫的制备及其性能与形态研究

Preparation of Polylactide/Halloysite-Nanoclay/Polytetrafluoro-Ethylene Composite Foam and Study of Properties and Morphology.

作者信息

George Raju Silla, Kargarzadeh Hanieh, Galeski Andrzej

机构信息

BioMedChem Doctoral School, the University of Lodz and Lodz Institutes of the Polish Academy of Sciences, 21/23 Matejki Street, 90-237 Lodz, Poland.

Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland.

出版信息

Nanomaterials (Basel). 2025 Apr 27;15(9):667. doi: 10.3390/nano15090667.

DOI:10.3390/nano15090667

PMID:40358284

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12073660/

Abstract

Halloysite nanoclay (HNC) and as-polymerized polytetrafluoroethylene powder (PTFE) were introduced into biodegradable polylactic acid (PLA) via a melt mixing technique to enhance its mechanical, rheological properties and foaming ability. The synergetic effects of these fillers on the morphological, mechanical, thermal, and foaming properties of PLA were investigated. Results indicated that the tensile properties were improved in comparison to neat PLA. Differential Scanning Calorimetry (DSC) revealed a decrease in PLA crystallization time with increasing filler concentration, indicating a strong nucleating effect on PLA crystallization. Extensional flow tests showed that strain hardening in PLA composites is influenced by fillers, with PTFE particularly exhibiting a more pronounced effect, attributed to nanofibrillation and entanglement during melt processing. The addition of a dual-filler system improved the melt strength and viscosity of PLA, resulting in foams with decreased cell size and increased cell density.

摘要

通过熔融共混技术将埃洛石纳米粘土（HNC）和聚合后的聚四氟乙烯粉末（PTFE）引入可生物降解的聚乳酸（PLA）中，以增强其机械性能、流变性能和发泡能力。研究了这些填料对PLA的形态、机械、热性能和发泡性能的协同作用。结果表明，与纯PLA相比，拉伸性能得到了改善。差示扫描量热法（DSC）显示，随着填料浓度的增加，PLA的结晶时间缩短，表明对PLA结晶有强烈的成核作用。拉伸流动试验表明，PLA复合材料中的应变硬化受填料影响，PTFE尤其表现出更明显的效果，这归因于熔体加工过程中的纳米纤维化和缠结。双填料体系的加入提高了PLA的熔体强度和粘度，从而得到了泡孔尺寸减小、泡孔密度增加的泡沫材料。