PDF(Pubmed)
Abstract：
Pineapple leaf fibres are an abundant agricultural waste product that contains 26.9% cellulose. The objective of this study was to prepare fully degradable green biocomposites made of polyhydroxybutyrate (PHB) and microcrystalline cellulose from pineapple leaf fibres (PALF-MCC). To improve compatibility with PHB, the PALF-MCC was surface modified using lauroyl chloride as an esterifying agent. The influence of the esterified PALF-MCC laurate content and changes in the film surface morphology on biocomposite properties was studied. The thermal properties obtained by differential scanning calorimetry revealed a decrease in crystallinity for all biocomposites, with 100 wt% PHB displaying the highest values, whereas 100 wt% esterified PALF-MCC laurate showed no crystallinity. The addition of esterified PALF-MCC laurate increased the degradation temperature. The maximum tensile strength and elongation at break were exhibited when adding 5% of PALF-MCC. The results demonstrated that adding esterified PALF-MCC laurate as a filler in the biocomposite film could retain a pleasant value of tensile strength and elastic modulus whereas a slight increase in elongation can help to enhance flexibility. For soil burial testing, PHB/ esterified PALF-MCC laurate films with 5-20% (w/w) PALF-MCC laurate ester had higher degradation than films consisting of 100% PHB or 100% esterified PALF-MCC laurate. PHB and esterified PALF-MCC laurate derived from pineapple agricultural wastes are particularly suitable for the production of relatively low-cost biocomposite films that are 100% compostable in soil.
摘要：
菠萝叶纤维是一种含有26.9%纤维素的丰富农业废弃物。这项研究的目的是从菠萝叶纤维（PALF-MCC）中制备由聚羟基丁酸酯（PHB）和微晶纤维素制成的完全可降解的绿色生物复合材料。为了提高与PHB的兼容性，使用月桂酰氯作为酯化剂对PALF-MCC进行表面改性。研究了酯化PALF-MCC月桂酸酯含量和膜表面形态变化对生物复合材料性能的影响。通过差示扫描量热法获得的热性能表明，所有生物复合材料的结晶度均降低，100重量%PHB显示最高值，而100重量%酯化的PALF-MCC月桂酸酯显示无结晶度。酯化PALF-MCC月桂酸酯的加入提高了降解温度。当添加5%的PALF-MCC时,表现出最大的拉伸强度和断裂伸长率。结果表明，在生物复合膜中添加酯化的PALF-MCC月桂酸酯作为填料可以保持令人满意的拉伸强度和弹性模量值，而伸长率的略微增加可以帮助增强柔韧性。土壤埋藏试验,具有5-20%(w/w)PALF-MCC月桂酸酯的PHB/酯化PALF-MCC月桂酸酯膜具有比由100%PHB或100%酯化PALF-MCC月桂酸酯组成的膜更高的降解。源自菠萝农业废物的PHB和酯化的PALF-MCC月桂酸酯特别适合于生产在土壤中100％可堆肥的相对低成本的生物复合膜。
