Biodegradation Properties of Melt Processed PBS/Chitosan Bio-Nanocomposites with Silica, Silicate,and Thermally Reduced Graphene

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymers & Polymer Composites Pub Date : 2018-02-01 DOI:10.1002/PC.23947

V. Mittal, N. Matsko, F. Patwary

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引用次数: 6

Abstract

Melt processed bio-nanocomposites of poly(butylene succinate) (PBS)-chitosan (CS) generated with varying amounts of silica, alumina-silicate, and thermally reduced graphene were analyzed for their biodegradation behavior. The nanocomposite samples were embedded in soil under natural environment for varying periods of time and the weight loss analysis was complemented with changes in surface morphology, crystallinity, and thermal degradation. Both the type and amount of filler were observed to affect the extent of biodegradation, though no change in biodegradation mechanism occurred. Nanocomposites had in general lower extent of weight loss than the pure blend, but the extensive surface roughness and cracks were observed for all systems indicating the initiation of biodegradation. Silica and silicate nanocomposites exhibited higher extent of biodegradation in comparison with graphene nanocomposites possibly because of the obstructive pathways to microbes in the presence of high aspect ratio graphene platelets. The crystallinity in the pure blend and nanocomposites was observed to increase as a function of embedding time because of degradation of the random amorphous material in the initial degradation phase. Subsequently, the increase levelled off because of attack of microbes on more organized crystalline content, which was also supported by the reduction in overall weight loss. Increase in melting point of PBS with embedding time as well as depletion of CS flakes from the cross-section of the composites in AFM confirmed that CS was degraded earlier than PBS. Thermal analysis also indicated faster onset of degradation of CS with soil burial time. The degradation studied through TGA-MS also revealed that degradation was accompanied by evolution of H2O, CO2, and NH3, along with other components. The temperature of evolution of these components from the nanocomposites was also affected during different stages of biodegradation. POLYM. COMPOS., 2016. © 2016 Society of Plastics Engineers

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含二氧化硅、硅酸盐和热还原石墨烯的熔融处理PBS/壳聚糖生物纳米复合材料的生物降解性能

用不同数量的二氧化硅、硅酸铝和热还原石墨烯制备了熔融处理的聚丁二酸丁二烯-壳聚糖(CS)生物纳米复合材料，分析了它们的生物降解行为。将纳米复合材料样品埋在自然环境下不同时间的土壤中，并结合表面形貌、结晶度和热降解的变化进行失重分析。填料的种类和数量对生物降解程度均有影响，但对生物降解机制没有影响。总的来说，纳米复合材料的失重程度低于纯共混物，但在所有系统中都观察到广泛的表面粗糙度和裂缝，这表明生物降解的开始。与石墨烯纳米复合材料相比，二氧化硅和硅酸盐纳米复合材料表现出更高的生物降解程度，这可能是因为存在高纵横比的石墨烯薄片阻碍了微生物的途径。纯共混物和纳米复合材料的结晶度随包埋时间的增加而增加，这是由于在初始降解阶段随机无定形材料的降解。随后，由于微生物对更有组织的晶体含量的攻击，这种增加趋于平稳，这也得到了总体体重减轻的支持。PBS的熔点随着包埋时间的增加而增加，AFM中CS薄片从复合材料的横截面上消失，证实了CS比PBS更早降解。热分析还表明，随着土壤埋藏时间的延长，CS的降解开始加快。通过热重分析-质谱分析，降解过程还伴随着H2O、CO2和NH3等组分的演化。在不同的生物降解阶段，这些组分从纳米复合材料中演化的温度也受到影响。变异较大。心神。, 2016年。©2016美国塑料工程师学会

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来源期刊

Polymers & Polymer Composites 工程技术-材料科学：表征与测试

CiteScore

4.30

自引率

9.50%

发文量

审稿时长

5.7 months

期刊介绍： Polymers & Polymer Composites provides a forum for the publication of expertly peer reviewed, international research into the following topics: - Fibre reinforced and particulate filled plastics - Engineering plastics - Nanocomposites - Polymers or polyblends intended for engineering use (including structural, load bearing electronic and electrical applications) - Fibre reinforced and particulate filled plastics - Structural adhesives - Textile & wood fibres - Biomaterials with a load bearing capacity, (including polymer based dental materials)