Preparation of poly‐d,l‐lactide based nanocomposites with polymer‐grafted silica by melt blending: Study of molecular, morphological, and mechanical properties,Polymer Composites

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Preparation of poly‐d,l‐lactide based nanocomposites with polymer‐grafted silica by melt blending: Study of molecular, morphological, and mechanical properties
Polymer Composites ( IF 4.8 ) Pub Date : 2020-12-14 , DOI: 10.1002/pc.25878
Nicolas Régibeau _{1,

2} , Rémi G. Tilkin _{1,

2} , Christian Grandfils ₁ , Benoît Heinrichs ₂

Affiliation

Polylactide was first designed for the pharmaceutical and medical fields. Unfortunately, polylactide, especially poly‐d,l‐lactide (PDLLA), presents too low mechanical properties for a wide range of applications. The addition of silica nanoparticles should reinforce the mechanical strength of PDLLA. In order to improve silica/polymer interactions, this study focused on the preparation of polymer chain grafted silica using two grafting methods. The first strategy relied upon the ring opening polymerization of d,l‐lactide on initiating silica surface (ie, “grafting from”). The second approach considered a sol‐gel synthesis process in presence of Si‐OR terminated polylactide chains to promote grafting of these chains on new silica particles (ie, “grafting to” method). Only “grafting from” silica successfully led to a nanoscale dispersion into the polyester matrix for silica content up to 5 wt%. A 3 wt% content of this silica allowed improving Young modulus of 106.0% and ultimate tensile stress of 63.7% compared to the PDLLA control.

中文翻译：

通过熔融共混制备带有聚合物接枝二氧化硅的聚-d，l-丙交酯基纳米复合材料：分子，形态和机械性能的研究

聚丙交酯最初是为制药和医疗领域设计的。不幸的是，聚丙交酯，聚-特别d，升-丙交酯（PDLLA），礼物太低的机械性能用于广泛的应用范围。二氧化硅纳米粒子的添加应增强PDLLA的机械强度。为了改善二氧化硅/聚合物的相互作用，本研究集中于使用两种接枝方法制备聚合物链接枝的二氧化硅。第一种策略依赖于d，l的开环聚合丙交酯在二氧化硅表面的起始（即“接枝”）。第二种方法考虑了在存在Si-OR终止的聚丙交酯链的情况下进行溶胶-凝胶合成过程，以促进这些链在新的二氧化硅颗粒上的接枝（即“接枝”方法）。只有“从”二氧化硅“接枝”才能成功地将纳米级分散体分散到聚酯基质中，从而二氧化硅含量可达5 wt％。与PDLLA对照相比，该二氧化硅的3wt％含量允许改善的杨氏模量为106.0％，极限拉伸应力为63.7％。

更新日期：2021-02-11

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