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Effect of tetrakis (2-hydroxyethyl) terephthalamide on crystallization properties of polylactic acid

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四(2-羟乙基)对苯二甲酰胺对聚乳酸结晶性能的影响研究

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Apr.2025, Vol.48 No.4: 524-530

DOI: 10.3969/j.issn.1003-5060.2025.04.015

Authors

LI Qingqing, DENG Shengsong, DU Jun, HE Hongbo, YAO Risheng

(School of Food and Biological Engineering, Hefei University of Technology, Hefei 230601, China)

Abstract and Keywords

Abstract: Using diethyl terephthalate and diethanol amine as raw materials, the polyhydroxy amide compound N,N,N',N'-tetrakis(2-hydroxyethyl) terephthalamide (THPP) obtained through organic synthesis as nucleating agent for polylactic acid (PLA), THPP and PLA were melt-extruded and pelletized in a twin-screw extruder to obtain modified PLA (PLA/THPP). Differential scanning calorimeter (DSC), X-ray diffractometer (XRD), polarizing microscope (POM), Vicat softening point tester and universal material testing machine were used to study the effect of adding different contents of THPP on the crystallization and mechanical properties of PLA. The results show that the addition of 0.7% THPP increases the crystallinity of PLA from 20.34% to 44.50%, 0.1% THPP increases the elongation at break of PLA by 3.1%, and 0.7% THPP increases its Vicat softening point after annealing from 123.0 ℃ to 161.3 ℃. In addition, the hot-stage polarized light microscope observes that the number of grains in the PLA sample added with THPP increases significantly and the grains are smaller within the same time of isothermal crystallization, and THPP exists in a homogeneous phase in PLA. However, too high content of THPP will increase the short-chain PLA, and the crystallinity will be poor.

Keywords: polylactic acid (PLA); nucleating agent; crystallization; polyhydroxy compound; mechanical properties

作者信息

李晴晴，邓胜松，杜俊，何红波，姚日生

（合肥工业大学食品与生物工程学院，安徽合肥230601）

摘要和关键词

摘要: 文章以对二苯甲酸二乙酯、二乙醇胺为原料, 以有机合成的多羟基酰胺类化合物 N, N, N', N'-四(2-羟乙基)对苯二甲酰胺(THPP)为聚乳酸(PLA)成核剂, 将 THPP 与 PLA 在双螺杆挤出机中熔融挤出造粒得到改性聚乳酸 PLA/THPP。通过差示扫描量热仪(differential scanning calorimeter, DSC)、X 射线衍射仪(X-ray diffractometer, XRD)、偏光显微镜(polarizing microscope, POM)、维卡软化点测定仪以及万能材料试验机研究加入不同质量分数的 THPP 对 PLA 结晶性能和力学性能的影响。结果表明: 添加 0.7% 的 THPP 使 PLA 结晶度从 20.34% 提高到 44.50%, 添加 0.1% 的 THPP 使 PLA 断裂伸长率提高 3.1%, 退火后添加 0.7% 的 THPP 使 PLA 的维卡软化点温度由 123.0 ℃ 提高到 161.3 ℃; 添加 THPP 的 PLA 在等温结晶相同时间内晶粒数目显著增加、晶粒更小, 且 THPP 在 PLA 中以均匀相存在, 但过高质量分数的 THPP 会使短链 PLA 增多, 结晶性能变差。

关键词: 聚乳酸（PLA）；成核剂；结晶；多羟基化合物；力学性能

Funding

安徽省科技重大专项资助项目（202003a05020060）；蚌埠市产业创新引导资金资助项目（JZ2020YDZJ0331）

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