High-heat and UV-barrier poly(lactic acid) by microwave-assisted functionalization of waste natural fibers.
High-heat and UV-barrier poly(lactic acid) by microwave-assisted functionalization of waste natural fibers.
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DOI：
10.1016/j.ijbiomac.2022.08.114
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发表时间：
2022-08
影响因子：
8.2
通讯作者：
Lv Ke;H. Shang;Mengke Tang;Xinyu Li;Liang Jiang;Sijia Lu;Dao-Min Tang;Donghui Huang
中科院分区：
文献类型：
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作者：
Lv Ke;H. Shang;Mengke Tang;Xinyu Li;Liang Jiang;Sijia Lu;Dao-Min Tang;Donghui Huang
聚乳酸（PLA）在包装领域的应用常常因气体/水阻隔性能不足、耐热性低和紫外线透过率高而显得相形见绌。在此，提出了一种环境友好且高效的微波辅助功能化（MAF）方法，用架桥剂对废弃竹纤维进行水接枝。它可以显着促进 MAF 竹纤维 (MAFB) 和相邻 PLA 链之间的界面相互作用，有助于均匀分散和紧密界面。凭借形态特征，MAFB 增强（5、10 和 20 wt%）PLA 生物复合材料实现了高机械性能、出色的耐热变形和紫外线照射性能以及出色的防水性能的意外组合。仅添加 5 wt% MAFB 后，PLA 复合薄膜的拉伸强度和韧性就增加到 46.5 MPa 和 0.6 MJ/m3，与相应的原始竹纤维 (PBF) 相比，分别增加了 52% 和近 107%。这有利地伴随着水蒸气渗透率的显着降低，PLA/MAFB (80/20) 降至最低值 3.5 × 10−11g∙m/Pa∙s∙m2，与对应物相比下降了近 79%。值得注意的是，MAFB 对 PLA 负载 10 和 20 wt% 纤维的紫外线阻挡率接近 100%，并且即使在 120 °C 等高温下也具有出色的耐热变形性。这一努力为开发与 PLA 具有高亲和力的多功能天然纤维铺平了道路，从而以环保的方式优雅地实现耐高温和抗紫外线的包装材料。
The application of poly(lactic acid) (PLA) in the packaging area is frequently dwarfed by the inadequate gas/water barrier properties, low heat resistance and high UV transmittance. Herein, an environmentally friendly and high-efficiency microwave-assisted functionalization (MAF) approach was proposed to aqueous grafting waste bamboo fibers with the bridging agent. It permitted significant promotion of interfacial interactions between the MAF bamboo fibers (MAFBs) and neighboring PLA chains, contributing to uniform dispersion and intimate interphase. Featuring the morphological features, the MAFB-reinforced (5, 10 and 20 wt%) PLA biocomposites achieved an unexpected combination of high mechanical properties, exceptional resistance to heat deflection and UV irradiation, and excellent water barrier performance. Upon addition of only 5 wt% MAFBs, the tensile strength and toughness of PLA composite films were increased to 46.5 MPa and 0.6 MJ/m3, increasing over 52 % and nearly 107 % compared to those of the counterpart loaded pristine bamboo fibers (PBFs), respectively. This was favorably accompanied by the remarkably reduced water vapor permeability, falling down to the lowest value of 3.5 × 10−11g∙m/Pa∙s∙m2for PLA/MAFB (80/20) with a decrease of nearly 79 % compared to the counterpart. It is of interest to note the MAFB-enabled nearly 100 % UV-blocking ratio for PLA loaded 10 and 20 wt% fibers, as well as excellent resistance to heat deflection even at high temperatures like 120 °C. This effort paves the way to multifunctional natural fibers with high affinity to PLA for elegant implementation of high-heat and UV-resistant packaging materials in an ecofriendly manner.