Lightweight,Strong and High Heat-Resistant Poly(lactide acid)Foams via Microcellular Injection Molding with Self-Assembly Nucleating Agent  

作　　者：Xiao-Hu Bing Wen-Yu Ma Ming-Hui Wu Peng Gao Xiao Zhou Hai-Bin Luo Long Wang Wen-Ge Zheng 

机构地区：[1]School of materials Science and Engineering,Shanghai University,Shanghai,200444,China [2]Ningbo Key Lab of Polymer Materials,Ningbo Institute of Material Technology and Engineering,Chinese Academy of Sciences,Ningbo,315201,China [3]University of Chinese Academy of Sciences,Beijing,100049,China

出　　处：《Chinese Journal of Polymer Science》2024年第6期739-750,共12页高分子科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52003280);the Zhejiang Provincial Natural Science Foundation of China(No.LQ21B040003);the S&T Innovation 2025 Major Special Programme of Ningbo(No.2021Z052);the Chinese Academy of Sciences Pioneer Hundred Talents Program.

摘　　要：Poly(lactide acid)(PLA)foams have shown considerable promise as eco-friendly alternatives to nondegradable plastic foams,such as polystyrene(PS)foams.Nevertheless,PLA foam typically suffers from low heat-resistance and poor cellular structure stemming from its inherent slow crystallization rate and low melt strength.In this study,a high-performance PLA foam with well-defined cell morphology,exceptional strength and enhanced heat-resistance was successfully fabricated via a core-back microcellular injection molding(MIM)process.Differential scanning calorimetry(DSC)results revealed that the added hydrazine-based nucleating agent(HNA)significantly increased the crystallization temperature and accelerated the crystallization process of PLA.Remarkably,the addition of a 1.5 wt%of HNA led to a significant reduction in PLA’s cell size,from 43.5µm to 2.87µm,and a remarkable increase in cell density,from 1.08×10^(7)cells/cm^(3)to 2.15×10^(10)cells/cm^(3).This enhancement resulted in a final crystallinity of approximately 55.7%for the PLA blend foam,a marked improvement compared to the pure PLA foam.Furthermore,at 1.5 wt%HNA concentration,the tensile strength and tensile toughness of PLA blend foams demonstrated remarkable improvements of 136%and 463%,respectively.Additionally,the Vicat softening temperature of PLA blend foam increased significantly to 134.8°C,whereas the pure PLA foam exhibited only about 59.7℃.These findings underscore the potential for the preparation of lightweight injection-molded PLA foam with enhanced toughness and heat-resistance,which offers a viable approach for the production of high-performance PLA foams suitable for large-scale applications.

关 键 词：Poly(lactide acid) Nucleating agent Microcellular injection molding HEAT-RESISTANCE Toughness 

分 类 号：TQ328[化学工程—合成树脂塑料工业]