Crystallization behavior and thermal properties of octa-phenyl-substituted silsesquioxane-modified polylactide (PLA)

IF 3.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science Pub Date : 2024-11-09 DOI:10.1007/s10853-024-10328-w

Mateusz Barczewski, Sandra Paszkiewicz, Javier Cañavate, Joanna Aniśko, Aleksander Hejna, Adam Piasecki, Beata Dudziec

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引用次数: 0

Abstract

This study aims to understand the effects of adding octa-phenyl-substituted silsesquioxane (phSQ) on the crystallization process and thermal stability of polylactide (PLA). Nowadays, PLA is the most industrially used compostable polymer, but its uses are limited by its low crystallization and thermal degradation during processing. The possibility of introducing functionalized silsesquioxanes (SQs) to improve thermal stability and increase its crystallinity and ductility in a controlled way is desirable. The nanometric size of the Si-O-Si cage, coupled with the influence of the functional groups attached to its structure, enables it to function as a heterogeneous nucleating agent. In this work, a specially synthesized octa-phenyl-substituted SQ (phSQ) was added to the PLA in 0.5–5 wt%. Crystallization in non-isothermal and isothermal conditions was conducted and monitored using differential scanning calorimetry (DSC); the course of the spherulite formation under identical conditions to DSC was also assessed using optical microscopy in polarized light. The results showed that phSQ increases the degree of crystallinity of PLA by introducing additional sites of heterogeneous nucleation but does not increase the spherulite growth coefficient. Additionally, the analysis of thermal properties indicates that the presence of phSQ could not have a positive impact on thermal stability. The agglomeration of the nanometric particles and changes in the main structural features of the polymeric matrix could be present in the samples, affecting the obtained results.

Graphical abstract

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八苯基取代硅倍半氧烷改性聚乳酸（PLA）的结晶行为和热性能

本研究旨在了解添加八苯基取代硅倍半氧烷（phSQ）对聚乳酸（PLA）结晶过程和热稳定性的影响。目前，聚乳酸是工业上使用最多的可堆肥聚合物，但由于其在加工过程中结晶度低和热降解，其用途受到了限制。引入功能化硅倍半氧烷（SQs）以改善热稳定性并以可控方式增加其结晶度和延展性的可能性是可取的。Si-O-Si 笼的纳米尺寸，加上其结构上所附官能团的影响，使其能够发挥异质成核剂的作用。在这项工作中，一种特殊合成的八苯基取代 SQ（phSQ）被添加到聚乳酸中，添加量为 0.5-5 wt%。采用差示扫描量热法（DSC）对非等温和等温条件下的结晶过程进行了监测；在与 DSC 相同的条件下，还采用偏振光光学显微镜对球状物的形成过程进行了评估。结果表明，phSQ 通过引入额外的异质成核位点提高了聚乳酸的结晶度，但并没有增加球状物的生长系数。此外，热性能分析表明，phSQ 的存在不会对热稳定性产生积极影响。样品中可能存在纳米颗粒的团聚和聚合物基质主要结构特征的变化，从而影响了所获得的结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.