The effects of cellulosic fillers on the mechanical, morphological, thermal, viscoelastic, and rheological properties of polyhydroxybutyrate biopolymers,Polymer Composites

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The effects of cellulosic fillers on the mechanical, morphological, thermal, viscoelastic, and rheological properties of polyhydroxybutyrate biopolymers
Polymer Composites ( IF 4.8 ) Pub Date : 2020-06-16 , DOI: 10.1002/pc.25681
Deniz Aydemir _{1,

2} , Douglas J. Gardner ₂

Affiliation

The aim of this study was to determine the effects of cellulosic fillers on the conventional and dynamic mechanical, thermal, morphological, and rheological properties of polyhydroxybutyrate (PHB) biopolymers. Polyhydroxybutyrate as a biopolymer matrix and cellulosic fillers including wood flour, microcrystalline cellulose, and cellulose nanofibrils (0.5 and 5 wt%) as reinforcing agents were used to produce the composite. According to the results obtained, the addition of 0.5 wt% cellulose nanofibrils improved both the flexural and tensile moduli of elasticity but other fillers and filler loading levels generally decreased the mechanical properties attributable to aggregations of fillers in the matrix. Thermal analysis results showed that the addition of cellulosic fillers did not influence the glass transition and crystallization temperature of the PHB whereas the crystallinity and melting temperature generally increased with the addition of the cellulosic fillers. Thermal stability of the composites generally improved with addition of the cellulosic fillers. The dynamic mechanical analysis results showed that both storage and loss moduli of all the samples generally decreased with increasing temperature. Elastic and viscous moduli of all the samples initially decreased with frequency but then generally increased according to the rheological analysis.

中文翻译：

纤维素填料对聚羟基丁酸酯生物聚合物的机械，形态，热，粘弹性和流变性质的影响

这项研究的目的是确定纤维素填料对聚羟基丁酸酯（PHB）生物聚合物的常规和动态机械，热，形态和流变性能的影响。使用聚羟基丁酸酯作为生物聚合物基质和纤维素填料，包括木粉，微晶纤维素和纤维素纳米原纤维（0.5和5 wt％）作为增强剂，来生产复合材料。根据获得的结果，添加0.5重量％的纤维素纳米原纤维改善了弹性的挠曲模量和拉伸模量，但是其他填料和填料负载水平通常降低了由于填料在基体中聚集引起的机械性能。热分析结果表明，添加纤维素填料不会影响PHB的玻璃化转变温度和结晶温度，而结晶度和熔融温度通常会随着添加纤维素填料而增加。复合材料的热稳定性通常通过添加纤维素填料而得到改善。动态力学分析结果表明，所有样品的储能模量和损耗模量通常都随温度升高而降低。根据流变分析，所有样品的弹性模量和粘滞模量最初随频率降低，但随后通常升高。复合材料的热稳定性通常通过添加纤维素填料而得到改善。动态力学分析结果表明，所有样品的储能模量和损耗模量通常都随温度升高而降低。根据流变分析，所有样品的弹性模量和粘弹性模量最初随频率降低，但随后通常升高。复合材料的热稳定性通常通过添加纤维素填料而得到改善。动态力学分析结果表明，所有样品的储能模量和损耗模量通常都随温度升高而降低。根据流变分析，所有样品的弹性模量和粘滞模量最初随频率降低，但随后通常升高。

更新日期：2020-06-16

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