Synchronous Toughening, Strengthening, and Ultraviolet Resistance of Immiscible Polylactic Acid/polypropylene Carbonate Blends Compatibilized by a Low Threshold of Reactive Janus Nanosheets

IF 5.2 1区化学 Q1 POLYMER SCIENCE Macromolecules Pub Date : 2024-12-02 DOI:10.1021/acs.macromol.4c01950

Jieyu Guan, Ning Ding, Pengwu Xu, Weijun Yang, Deyu Niu, Xu Zhang, Tianxi Liu, Piming Ma

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Abstract

Poor toughness limits the use of biobased and biodegradable polylactic acid (PLA). The conventional method of blending with flexible polymers toughens PLA with a significant loss of strength and incompatibility. In this work, carbon dioxide-based biodegradable polypropylene carbonate (PPC) was used as the flexibilizer, and PPC-TiO₂-epoxy Janus nanosheets (JNs) synthesized by grafting PPC-diols and epoxy groups onto each side of titanium dioxide nanosheets respectively were used as compatibilizers. PLA/PPC/JNs blends were then prepared by melt processing. The in situ reaction between the epoxy groups on one side of the JNs and the carboxylic acid groups on the PLA occurs, forming a solid covalent bond. The grafted PPC chains on the other side of the JNs were tightly entangled with those of the PPC flexibilizer. Moreover, due to the Pickering effect of JNs, they can stably anchor at the interface, which reduces the interfacial tension and significantly enhances compatibility. Compared with PLA/PPC, the addition of as low as even 0.3 wt % JNs reduced the PPC domain size from 3.25 to 0.42 μm, and consequently, the elongation at break increased by 250%. Moreover, the introduction of JNs significantly improved the UV shielding in both UV-A and UV–B regions and the UV aging resistance of the blends without reducing the transparency that much. Herein, this work provides a new method for improving the compatibility of PLA-based blends and preparing high-performance PLA materials.

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低阈值活性Janus纳米片增容非混相聚乳酸/碳酸聚丙烯共混物的同步增韧、强化和抗紫外线性能

较差的韧性限制了生物基和可生物降解聚乳酸（PLA）的使用。与柔性聚合物共混的常规方法使PLA增韧，但强度和不相容性显著降低。本研究以二氧化碳基可生物降解的碳酸丙烯酯（PPC）为柔韧剂，以二氧化钛纳米片两侧分别接枝PPC-二醇和环氧基合成的PPC- tio2 -环氧基Janus纳米片（JNs）为相容剂。然后通过熔体加工制备PLA/PPC/JNs共混物。JNs一侧的环氧基团与PLA上的羧酸基团之间发生原位反应，形成固体共价键。JNs另一侧接枝的PPC链与PPC柔韧剂的链紧密缠绕。此外，由于JNs的皮克林效应，它们可以稳定地锚定在界面上，从而降低了界面张力，显著提高了相容性。与PLA/PPC相比，添加0.3 wt %的JNs使PPC畴尺寸从3.25 μm减小到0.42 μm，断裂伸长率提高了250%。此外，JNs的引入显著提高了共混物在UV- a和UV- b区域的紫外线屏蔽性能和抗紫外线老化性能，同时不降低透明度。本研究为提高PLA基共混物的相容性和制备高性能PLA材料提供了一种新方法。

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来源期刊

Macromolecules 工程技术-高分子科学

CiteScore

9.30

自引率

16.40%

发文量

942

审稿时长

2 months

期刊介绍： Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.