由于半结晶聚酯(乳酸)(PLA)与其他增强材料结合使用,相分离等挑战,环境污染,制造困难可能会阻碍解放军的利益,包括完全的生物降解性和强大的机械性能。在目前的调查中,熔融共混用于建立低分子量和高分子量聚乳酸(LPLA和HPLA)的混合物。结晶度,流变学,使用旋转流变仪对组合物的力学性能进行了分析,差示扫描量热法,X射线衍射,偏振光学显微镜,扫描电子显微镜,和通用测试设备。结果表明LPLA和HPLA之间的相容性。此外,LPLA浓度的增加导致结晶速率的降低,球晶尺寸,分数结晶度,等温结晶过程中的XRD峰强度。LPLA在等温结晶过程中充当稀释剂,而HPLA在非等温结晶过程中充当成核剂,促进LPLA晶体的生长并导致共结晶。具有5%LPLA质量分数的共混体系表现出最高的拉伸强度并增强流变特性。通过有效地利用PLA的各种分子量之间的关系,流变学,和结晶行为,这种审查改善了材料的物理和机械特性,开辟新的机遇。
As semi-crystalline polyester (lactic acid) (PLA) is combined with other reinforcing materials, challenges such as phase separation, environmental pollution, and manufacturing difficulties could hinder the benefits of PLA, including complete biodegradability and strong mechanical properties. In the present investigation, melt blending is utilized to establish a mixture of low- and high-molecular-weight polylactic acids (LPLA and HPLA). The crystallinity, rheology, and mechanical properties of the combination were analyzed using rotational rheometry, differential scanning calorimetry, X-ray diffraction, polarized optical microscopy, scanning electron microscopy, and universal testing equipment. The results demonstrate compatibility between LPLA and HPLA. Moreover, an increase in LPLA concentration leads to a decrease in the crystallization rate, spherulite size, fractional crystallinity, and XRD peak intensity during isothermal crystallization. LPLA acts as a diluent during isothermal crystallization, whereas HPLA functions as a nucleating agent in the non-isothermal crystallization process, promoting the growth of LPLA crystals and leading to co-crystallization. The blended system with a 5% LPLA mass fraction exhibits the highest tensile strength and enhances rheological characteristics. By effectively leveraging the relationship between various molecular weights of PLA\'s mechanical, rheological, and crystallization behavior, this scrutiny improves the physical and mechanical characteristics of the material, opening up new opportunities.