Reyhaneh Aminyan, Hamid Garmabi, Ali Asghar Katbab
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引用次数: 0
摘要
聚乳酸(PLA)是食品包装应用合成聚合物中的主要候选材料。然而,聚乳酸较差的加工性能和机械性能限制了它的实际应用。在此,我们使用聚乳酸和乙烯-醋酸乙烯(EVA)共聚物制备了超韧热塑性硫化弹性体(TPV),并优化了 EVA 的组成。为了提高固化效率,将动态固化剂过氧化二异丙苯(DCP)用作 EVA-DCP 母料。纤维素纳米晶体(CNC)被进一步用作生物相容性和可再生的纳米填料,以聚乳酸-CNC 母料的形式使用,从而提高了机械强度和形状记忆性能(SMP)。动态固化热塑性弹性体(TPE)前体可减小聚乳酸玻璃化转变前弹性模量(\(E^{\prime}\))的温度依赖性。因此,与热塑性弹性体相比,热塑性硫化弹性体的形状固定性(FR)得到了改善,因为热塑性硫化弹性体显示出了\(FR>98\%),而热塑性硫化弹性体60(60%聚乳酸)显示出了100%的最高FR。热塑性硫化弹性体显示出更高的回收率(RR),其回收率为87.25%,其中含有1.5% CNC的热塑性硫化弹性体60的回收率最高,达到94.1%。机械性能分析表明,通过调整最终热塑性硫化弹性体的流变行为和形态,优化后的热塑性硫化弹性体:CNC 具有超强韧性。这些结果对智能食品包装的应用前景十分看好。
Supertough Shape Memory Bionanocomposites of Thermoplastic Vulcanizates Based on PLA- EVA and Cellulose Nanocrystal
Polylactic acid (PLA) is the main candidate among the synthetic polymers for food packaging application. However, its poor processing and mechanical performance have limited its practical application. Here, we prepared a supertough thermoplastic vulcanizate (TPV) using PLA and ethylene vinyl acetate (EVA) copolymer with optimized EVA composition. The dynamic curing agent, dicumyl peroxide (DCP), was used as EVA-DCP masterbatch to improve its curing efficiency. Cellulose nanocrystals (CNCs) were further used as the biocompatible and renewable nanofiller, used in the form of PLA-CNC masterbatch, leading to improved mechanical strength and shape memory performance (SMP). Dynamically curing the thermoplastic elastomer (TPE) precursors diminished the temperature-dependency of elastic modulus (\(E^{\prime}\)) prior to PLA’s glass transition. Thus, improving the shape fixity (FR) of the TPVs compared to their TPEs as the TPVs showed \(FR>98\%\) while the TPV60 (60% PLA) showed the highest FR of 100%. The TPVs showed higher recovery ratio (RR) with \(RR>87.25\%\) with the TPV60 containing 1.5% CNC, which showed the highest RR of 94.1%. The mechanical performance analyses showed that the optimized TPV: CNC possesses a supertough nature, achieved by tuning the rheological behavior and morphology of the final TPVs. The results were quite promising for smart food packaging applications.
期刊介绍:
The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.