The effects of cellulosic fillers on the mechanical, morphological, thermal, viscoelastic, and rheological properties of polyhydroxybutyrate biopolymers
The effects of cellulosic fillers on the mechanical, morphological, thermal, viscoelastic, and rheological properties of polyhydroxybutyrate biopolymers
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DOI：
10.1002/pc.25681
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发表时间：
2020-06-16
影响因子：
5.2
通讯作者：
Gardner, Douglas J.
中科院分区：
文献类型：
--
作者：
Aydemir, Deniz;Gardner, Douglas J.
本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。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，和纤维素纳米纤丝（0.5和5重量%）作为增强剂，用于生产的复合材料。根据所获得的结果，添加0.5wt%纤维素纳米纤丝改善了弹性的弯曲模量和拉伸模量，但是其它填料和填料加载水平通常降低了归因于填料在基质中的聚集的机械性能。热分析结果表明，纤维素填料的加入对聚羟基丁酸酯的玻璃化转变温度和结晶温度没有影响，但其结晶度和熔融温度随纤维素填料的加入而提高。复合材料的热稳定性通常随着纤维素填料的加入而改善。动态力学分析结果表明，随着温度的升高，所有样品的储能模量和损耗模量普遍下降。所有样品的弹性模量和粘性模量最初随频率降低，但根据流变学分析，然后一般增加。
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.