本研究以 PEPA、3,5-二氨基苯甲酸 (DABA) 和油酰氯 (OC) 为原料制备了一种新型增容剂苯甲酰胺接枝聚乙烯多胺 (PEPA) 含溶剂链 (PDABA-g-PEPA-O)并用于改性剑麻微晶纤维素 (MCC)。天然橡胶 (NR) 填充改性 MCC 以制备复合材料。考察了制备的增容剂对NR/MCC/PEPA-g-PDABA-O复合材料的增容效果,并通过分子动力学模拟(MD)分析了其增容机理。结果表明,添加3wt%(以MCC质量计算)的PDABA-g-PEPA-O可以改善NR与MCC的界面相互作用。当添加2.5phr MCC和3wt%的PDABA-g-PEPA-O时,NR复合材料的最高拉伸强度为25.319 MPa,提高了13%。07% 与 NR/2.5phr MCC 复合材料相比。此外,MD结果表明,PDABA-g-PEPA-O分子结构中的酰胺和胺基与纤维素和PDABA-g-PEPA-O的羟基形成强氢键和强范德华相互作用。 O与NR表现出良好的相容性,达到了增容的目的。此外,在分子模拟中,通过添加 PDABA-g-PEPA-O,复合材料的拉伸、变形和抗剪切性能得到增强。MD结果为相容剂的分子设计和制备以及在分子水平上理解其在聚合物复合材料中的相容机理提供了依据。MD结果表明,PDABA-g-PEPA-O分子结构中的酰胺基和胺基与纤维素的羟基形成强氢键和强范德华相互作用,PDABA-g-PEPA-O表现出良好的与NR相容,达到了相容化的目的。此外,在分子模拟中,通过添加 PDABA-g-PEPA-O,复合材料的拉伸、变形和抗剪切性能得到增强。MD结果为相容剂的分子设计和制备以及在分子水平上理解其在聚合物复合材料中的相容机理提供了依据。MD结果表明,PDABA-g-PEPA-O分子结构中的酰胺基和胺基与纤维素的羟基形成强氢键和强范德华相互作用,PDABA-g-PEPA-O表现出良好的与NR相容,达到了相容化的目的。此外,在分子模拟中,通过添加 PDABA-g-PEPA-O,复合材料的拉伸、变形和抗剪切性能得到增强。MD结果为相容剂的分子设计和制备以及在分子水平上理解其在聚合物复合材料中的相容机理提供了依据。从而达到了兼容的目的。此外,在分子模拟中,通过添加 PDABA-g-PEPA-O,复合材料的拉伸、变形和抗剪切性能得到增强。MD结果为相容剂的分子设计和制备以及在分子水平上理解其在聚合物复合材料中的相容机理提供了依据。从而达到了兼容的目的。此外,在分子模拟中,通过添加 PDABA-g-PEPA-O,复合材料的拉伸、变形和抗剪切性能得到增强。MD结果为相容剂的分子设计和制备以及在分子水平上理解其在聚合物复合材料中的相容机理提供了依据。
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Preparation of compatibilizer PDABA-g-PEPA-O and its application in NR/MCC composites and analysis of compatibilization mechanism
In this study, a new type of compatibilizer, benzamide-grafted polyethylene polyamine (PEPA) containing solvent chain (PDABA-g-PEPA-O) was prepared from PEPA, 3,5-diaminobenzoic acid (DABA) and Oleoyl chloride (OC) and used to modify sisal microcrystalline cellulose (MCC). The natural rubber (NR) was filled with the modified MCC to prepare composites. The compatibilization effect of the prepared compatibilizer on the NR/MCC/PEPA-g-PDABA-O composites was investigated and its compatibilization mechanism was analyzed by molecular dynamics simulation (MD). The results show that adding 3wt% (calculated by MCC mass) PDABA-g-PEPA-O can improve the interfacial interaction between NR and MCC. The highest tensile strength of the NR composites was 25.319 MPa when 2.5phr MCC and 3wt% of PDABA-g-PEPA-O were added and is improved by 13.07% compared with that of NR/2.5phr MCC composites. In addition, the MD results showed that the amide and amine groups in the molecular structure of PDABA-g-PEPA-O formed a strong hydrogen bond and a strong van der Waals interaction with the hydroxyl groups of cellulose and PDABA-g-PEPA-O exhibited good compatibility with NR, which achieved the purpose of compatibilization. Moreover, the properties of tensile, deformation and shear resistance of the composites were enhanced with the addition of PDABA-g-PEPA-O in molecular simulation. The MD results provided a basis for the molecular design and preparation of compatibilizers and understanding their compatibilization mechanism in the polymer composites at a molecular level.