Aliotta Laura, Sciara Letizia Maria, Cinelli Patrizia, Canesi Ilaria, Lazzeri Andrea
Department of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, Italy.
Interuniversity National Consortium of Materials Science and Technology (INSTM), 50121 Florence, Italy.
Polymers (Basel). 2022 Feb 28;14(5):977. doi: 10.3390/polym14050977.
Three different commercial nucleating agents (LAK, talc, and calcium carbonate) were added at different weight percentages into poly (lactic acid) (PLA) in order to investigate the mechanical and thermo-mechanical behavior of blends in correlation to injection molding parameters. After as-sessing the best content of each nucleating agent, analyzing isothermal and non-isothermal crys-tallization, two cycle times that can be industrially adopted were selected. Crystallinity highly impacts the flexural modulus, while it improves the heat deflection temperature only when the crystallinity percentage is above 50%; nevertheless, an excessive crystallinity content leads to a decrement of impact resistance. LAK does not appear to be sensitive to cycle time while talc and calcium carbonate proved to be effective if a cycle time of 60 s is adopted. Since the choice of nu-cleating agent is not univocal, the identification of the best nucleating agents is subject to the technical specifications required by the application, accotuing for the most important commercial requirements (productivity, temperature, and impact resistance).
将三种不同的商业成核剂（LAK、滑石粉和碳酸钙）以不同重量百分比添加到聚乳酸（PLA）中，以研究共混物的力学和热机械行为与注塑成型参数之间的关系。在评估每种成核剂的最佳含量、分析等温结晶和非等温结晶后，选择了两种可在工业上采用的循环时间。结晶度对弯曲模量有很大影响，只有当结晶度百分比高于50%时，它才会提高热变形温度；然而，过高的结晶度含量会导致抗冲击性下降。LAK似乎对循环时间不敏感，而滑石粉和碳酸钙在采用60秒的循环时间时被证明是有效的。由于成核剂的选择并非唯一，最佳成核剂的确定取决于应用所需的技术规格，同时考虑最重要的商业要求（生产率、温度和抗冲击性）。
