PLA-（DFA-EG）_m型共聚物的合成及表征

发布时间：2018-06-13 07:37

  本文选题：二聚脂肪酸 + 聚乳酸　； 参考：《河南工业大学》2012年硕士论文

【摘要】：近年来，随着全球环境压力和经济压力的加重，对可降解塑料的品种、性能也提出了新的要求。聚乳酸因具有良好生物相容性、生物降解性、生物可吸收性以及优良的力学性能，在农业、食品包装、医疗卫生等领域得到了广泛应用，但因其玻璃化转变温度较高，性脆，柔韧性差，需通过改性以提高其加工和应用性能，这就为聚乳酸降解塑料的发展提供了动力。 本文以乳酸、C36二聚脂肪酸、乙二醇为主要原料，合成了DFA-EG不饱和聚酯、PLA和PLA-(DFA-EG)m型三元共聚物，研究了反应时间、反应温度、催化剂用量及反应时间对它们的影响，研究结果如下： 采用直接熔融缩聚法，，以不饱和二聚脂肪酸和乙二醇为原料，在乙二醇和不饱和二聚脂肪酸物质比为1:2，氯化亚锡为催化剂，催化剂用量为0.7%（w/w），反应温度为170℃，抽真空的条件下反应3h制备了反应程度较高的DFA-EG不饱和聚酯。 以乳酸为原料，采用直接熔融缩聚法，研究了催化剂用量、反应温度、反应时间等条件对共聚物PLA酸值和反应程度的影响。结果表明，在以氯化亚锡为催化剂，催化剂用量为0.7%（w/w），反应温度为170℃，反应时间为7h的条件下，即可得到反应程度高达95%左右的PLA。 采用直接熔融缩聚法，以聚乳酸和DFA-EG不饱和聚酯为原料，经共聚制得PLA-(DFA-EG)m型三元共聚物。经研究可知适宜的反应条件为：PLA和DFA-EG不饱和聚酯质量比为80/20，氯化亚锡为催化剂，催化剂用量为0.7%（w/w），反应温度为170℃的条件下反应10h，在此条件下，得到了反应程度可达95%左右的PLA-(DFA-EG)m型三元共聚物。共聚物提纯后，经红外光谱验证了目标产物的存在。
[Abstract]:In recent years, with the aggravation of global environmental and economic pressures, new requirements have been put forward for the variety and performance of degradable plastics. Polylactic acid (PLA) has been widely used in agriculture, food packaging, medical and sanitary fields because of its good biocompatibility, biodegradability, bioabsorbability and excellent mechanical properties, but it is brittle because of its high glass transition temperature. Because of its poor flexibility, it needs to be modified to improve its processing and application properties, which provides a driving force for the development of poly (lactic acid) degradable plastics. In this paper, DFA-EG unsaturated polyester PLA and PLA-DFA-EGM terpolymer were synthesized from C36 dimer fatty acid and ethylene glycol. The effects of reaction time, reaction temperature, amount of catalyst and reaction time on them were studied. The results are as follows: using direct melt Polycondensation method, using unsaturated dimer fatty acid and ethylene glycol as raw materials, the ratio of ethylene glycol to unsaturated dimer fatty acid is 1: 2, and stannous chloride is used as catalyst. DFA-EG unsaturated polyester with high degree of reaction was prepared under the conditions of reaction temperature 170 鈩

本文编号：2013243