Abstract
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 43.5 μm to 2.87 μm,and a remarkable increase in cell density,from 1.08x107 cells/cm3 to 2.15x1010 cells/cm3.This enhance-ment resulted in a final crystallinity of approximately 55.7％for the PLA blend foam,a marked improvement compared to the pure PLA foam.Fur-thermore,at 1.5 wt％HNA concentration,the tensile strength and tensile toughness of PLA blend foams demonstrated remarkable improve-ments of 136％and 463％,respectively.Additionally,the Vicat softening temperature of PLA blend foam increased significantly to 134.8 ℃,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.
基金项目
国家自然科学基金(52003280)
浙江省自然科学基金(LQ21B040003)
Science and Technology Innovation Major Special Programme of Ningbo(2025)(2021Z052)
Chinese Academy of Sciences Pioneer Hundred Talents Program()
维普
万方数据