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首页> 外文期刊>RSC Advances >Fully biodegradable food packaging materials based on functionalized cellulose nanocrystals/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) nanocomposites
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Fully biodegradable food packaging materials based on functionalized cellulose nanocrystals/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) nanocomposites

机译：基于功能化纤维素纳米晶体/聚（3-羟基丁酸酯-co-3-羟基戊酸酯）纳米复合材料的可完全生物降解的食品包装材料

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Current packaging materials (mainly composed of petroleum-based synthetic polymers) face environmental and disposal issues, and as a result, developing eco-friendly and bio-based nanocomposites as alternatives have motivated academic and industrial research. We report here on our effort to develop a transparent nanocomposite-based packaging film comprised of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and functionalized cellulose nanocrystals (cellulose nanocrystal methyl ester, CNC-me). The resultant CNC-me with hydrophobic ester groups are uniformly dispersed in PHBV without the aid of a compatibilizer or surfactant. Therefore, both the crystallization temperature and crystallinity of the PHBV matrix were increased due to the heterogeneous nucleating effect of CNC-me. With an increase of CNC-me concentration, significant improvements in mechanical performance, thermal stability, barrier and migration properties were achieved, which were ascribed to the improved interfacial interaction and increased crystallinity. Compared to neat PHBV, the tensile strength and maximum decomposition temperature (T-max) of the nanocomposites all achieved their maximum values at loading levels of 20 wt% CNC-me. Meanwhile the overall migration levels in both non-polar and polar simulants were well below the limits required by the current legislative standards for food packaging materials.
机译：当前的包装材料（主要由石油基合成聚合物组成）面临环境和处置问题，因此，开发环保型和生物基纳米复合材料作为替代材料已经激发了学术和工业研究的热情。我们在这里报告了我们为开发一种透明的基于纳米复合材料的包装膜而做出的努力，该包装膜由聚（3-羟基丁酸酯-co-3-羟基戊酸酯）（PHBV）和功能化的纤维素纳米晶体（纤维素纳米晶体甲酯，CNC-me）组成。所得的具有疏水性酯基的CNC-me无需增容剂或表面活性剂即可均匀分散在PHBV中。因此，由于CNC-me的异形成核作用，PHBV基质的结晶温度和结晶度均增加。随着CNC-me浓度的增加，机械性能，热稳定性，阻挡层和迁移性能得到了显着改善，这归因于界面相互作用的改善和结晶度的提高。与纯PHBV相比，纳米复合材料的拉伸强度和最高分解温度（T-max）在20 wt％CNC-me的负载水平下均达到了最大值。同时，非极性和极性模拟物的总体迁移水平都远低于现行食品包装材料立法标准要求的限制。

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