Enhancing poly(lactic acid)/maleated polypropylene blend with magnesium oxide catalyst: a reactive blending approach for improved mechanical properties

IF 1.7 4区 工程技术 Q4 POLYMER SCIENCE
Iman Nikkhah Sokhanvar , Narjes Sadat Karbalaei Ghomi , Seyed Amin Mirmohammadi , Afshar Alihosseini , Robabeh Nasirian
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Abstract

Some defects of polylactic acid (PLA), especially its poor mechanical properties, were modified using a minimum content of non-biodegradable maleated polypropylene (MAPP). To this end, first, the amount of MAPP was optimized, which was 20 wt.%. Second, MgO was used as a new catalyst to improve the exchange reactions between active groups in both polymers in a reactive blending process. Tensile and izod analyses showed that, compared to neat PLA, with a slight decrease in modulus and tensile strength, elongation at break, and impact resistance were improved in the presence of 20 and 0.1 wt.% of MAPP and MgO, respectively. This improvement in mechanical properties can be related to the exchange reactions between two polymers and the formation of PLA-MAPP block copolymers. MFI and WDCA analyses demonstrated the increase in melt flowability and surface hydrophilicity of the resulting blends, respectively. DSC analysis showed that the Tg values of both polymers approached each other in the presence of catalyst. Also, the elimination of cold crystallization of PLA and the decrease in the Tm and crystallinity of both polymers are clear reasons for the miscibility of the alloy. TEM displayed the proper dispersion of MgO nanoparticles within the polymer matrix, and in addition, the XRD test also proved the decrease in the crystallinity of both polymers and appropriate miscibility of the samples containing 20 and 0.1 wt.% of MAPP and MgO, respectively. These results can promise the design of a compound with the maximum amount of PLA for further use in various industries.

用氧化镁催化剂增强聚(乳酸)/马来酸化聚丙烯共混物:改善机械性能的反应共混方法
使用最低含量的不可生物降解马来酸化聚丙烯(MAPP)改良了聚乳酸(PLA)的一些缺陷,尤其是其较差的机械性能。为此,首先优化了 MAPP 的用量,使其达到 20 wt.%。其次,将氧化镁用作一种新催化剂,以改善活性混合过程中两种聚合物中活性基团之间的交换反应。拉伸和 izod 分析表明,与纯聚乳酸相比,MAPP 和氧化镁的含量分别为 20 和 0.1 wt.%时,聚乳酸的模量和拉伸强度略有下降,但断裂伸长率和抗冲击性均有所提高。机械性能的改善可能与两种聚合物之间的交换反应以及聚乳酸-MAPP 嵌段共聚物的形成有关。MFI 和 WDCA 分析表明,所得共混物的熔体流动性和表面亲水性分别有所提高。DSC 分析表明,在催化剂存在的情况下,两种聚合物的 Tg 值相互接近。此外,聚乳酸冷结晶的消除以及两种聚合物 Tm 和结晶度的降低也是合金可混溶的明显原因。TEM 显示氧化镁纳米粒子在聚合物基质中的适当分散,此外,XRD 测试也证明了两种聚合物结晶度的降低,以及分别含有 20 和 0.1 wt.% MAPP 和氧化镁的样品的适当相溶性。这些结果有望设计出一种具有最大聚乳酸含量的化合物,进一步应用于各行各业。
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来源期刊
CiteScore
3.50
自引率
5.30%
发文量
37
审稿时长
1.6 months
期刊介绍: The scope of the journal is to publish original contributions and reviews on studies, methodologies, instrumentation, and applications involving the analysis and characterization of polymers and polymeric-based materials, including synthetic polymers, blends, composites, fibers, coatings, supramolecular structures, polysaccharides, and biopolymers. The Journal will accept papers and review articles on the following topics and research areas involving fundamental and applied studies of polymer analysis and characterization: Characterization and analysis of new and existing polymers and polymeric-based materials. Design and evaluation of analytical instrumentation and physical testing equipment. Determination of molecular weight, size, conformation, branching, cross-linking, chemical structure, and sequence distribution. Using separation, spectroscopic, and scattering techniques. Surface characterization of polymeric materials. Measurement of solution and bulk properties and behavior of polymers. Studies involving structure-property-processing relationships, and polymer aging. Analysis of oligomeric materials. Analysis of polymer additives and decomposition products.
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