| 杜仲胶与合成反式-1,4-聚异戊二烯非等温结晶性能对比 |
| Comparative Study on Non-isothermal Crystallization Performance of Eucommia Ulmoide gum and Trans -1,4- Polyisoprene |
| 投稿时间：2015-02-11 修订日期：2015-02-11 |
| DOI： |
| 中文关键词: 杜仲胶 合成反式-1,4-聚异戊二烯 非等温结晶动力学 |
| 英文关键词: eucommia ulmoide gum trans-1,4-polyisoprene non-isothermal crystallization kinetics |
| 基金项目: |
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| 中文摘要: |
| 本文首先通过红外光谱(IR)、核磁共振(1H-NMR)和渗透凝胶色谱(GPC)等测试手段表征了本实验选用的杜仲胶(EUG)和合成反式-1,4-聚异戊二烯(TPI)的化学组成和结构差异,进而采用差示扫描量热仪(DSC)和偏光显微镜(POM)分别测试了EUG和TPI的非等温结晶行为,Mo法研究了两者的非等温结晶动力学并进行了对比。结果表明,Mo法处理EUG和TPI的非等温结晶过程较为理想。非等温结晶动力学研究得到的t1/2和FT等结晶参数表明,随降温速率的增加,EUG和TPI的结晶速率增大,EUG结晶速率快于TPI。根据Kissinger方程求得EUG的结晶活化能为102.8 kJ/mol,TPI为97.4 kJ/mol。这些非定温结晶性能的差异主要来源于二者不同的合成机理所造成的杂质种类、分子链端基以及分子量分布的不同。 |
| 英文摘要: |
| IR,1H-NMR and GPC was used to characterize the composition and structure difference between eucommia ulmoide gum and synthetic trans-1,4-polyisoprene first. The non-isothermal crystallization behavior of EUG and TPI was studied by means of differential scanning calorimetry and polarizingSopticalSmicroscope POM. The Mo equation was used to analyze the non-isothermal crystallization data of EUG and TPI. The results showed that Mo method could describe the non-isothermal crystallization process of EUG and TPI very well. The values of t1/2 and FT showed that the crystallization rate of EUG and TPI increased with cooling rate increasing, and EUG crystallized faster than TPI. The activation energies of crystallization evaluated by Kissinger method were to be 102.8 kJ/mol and 97.4 kJ/mol separately for EUG and TPI. The different non-isothermalScrystallizingSpropertiesSbetween TPI and EUG come mainly from the different type of impurity, molecular chain end group and molecular weight distribution resulting from the different synthetic mechanism of the EUG and TPI. |
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