| 一步合成的聚乙醇酸在不同介质中的熔融水解 |
| |
| 作者单位： | ;1.洛阳师范学院化学化工学院;2.河南省功能导向重点实验室 |
| |
| 摘 要： | 用一步合成法制备聚乙醇酸,并系统研究了熔融状态下在蒸馏水和氢氧化钠水溶液两种介质中的降解规律.降解过程中,在两种介质中,聚乙醇酸质量损失率均呈现出逐渐增大的趋势、熔点和特性黏数及介质pH值均逐渐降低,结晶度起初增大随后下降.在蒸馏水中降解,聚乙醇酸的结构无变化;在氢氧化钠水溶液中降解,结构变化较大.聚乙醇酸在氢氧化钠水溶液中熔融降解比在蒸馏水中显著.
|
| 关 键 词： | 聚乙醇酸 熔融状态 降解 特性黏数 |
Melting Hydrolysis of Polyglycolic Acid Acquired by One-step Reaction in Different Medium |
| |
| Institution: | ,College of Chemistry and Chemical Engineering,Henan Key Laboratory of Function-Oriented Porous Materials,Luoyang Normal University |
| |
| Abstract: | Polyglycolic acid was synthesized by one-step reaction.In the present investigation,a study on degradation of was carried out systematically under melting state.Under melting conditions,polyglycolic acid was degraded in two aqueous media:distilled H_2O and NaOH aqueous solution.Degradation occurs with an increase in mass loss,a decrease in melting point and intrinsic viscosity as well as pH,an increase in crystallinity during the initial degradation period and then a decrease afterwards.The chemical structure of polyglycolic acid has no change during degradation in H_2O.The chemical structure has a great change in NaOH solution.Polyglycolic acid degrades faster in NaOH solution than in distilled water. |
| |
| Keywords: | polyglycolic acid melting state degradation intrinsic viscosity |
| 本文献已被 CNKI 等数据库收录！ |
|
