| 引用本文: | 代晓青,肖加余,曾竟成,等.反应性树脂体系化学增黏和物理减黏机制的分离.[J].国防科技大学学报,2009,31(5):135-140.[点击复制] |
| DAI Xiaoqing,XIAO Jiayu,ZENG Jingcheng,et al.Separation of Chemical Mechanism of Viscous Increase and Physical Mechanism of Viscous Falling for Reactive Resin System[J].Journal of National University of Defense Technology,2009,31(5):135-140[点击复制] |
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| 反应性树脂体系化学增黏和物理减黏机制的分离 |
| 代晓青, 肖加余, 曾竟成, 江大志, 边立平 |
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(国防科技大学 航天与材料工程学院，湖南 长沙 410073)
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| 摘要: |
| 采用等温差示扫描量热(DSC)法，研究了CYD-128环氧树脂与GA-327(DDM改性芳胺)的固化度-时间变化关系；采用AR2000EX型旋转流变仪，测试了上述体系的等温黏 度-时间关系。比较等温条件下的固化度-时间关系和黏度-时间关系，建立了等温条件下的黏度-固化度的等时对应关系，结果表明在纯化学增黏机制影响下，树脂体系的黏度随固化度增加先缓慢增加，当固化度增大到一定程度后黏度快速增加。将等温条件下的黏度-固化度关系进行变换，得到恒定固化度下的黏度-温度关系，揭示了在物理减黏机制影响下，树脂体系黏度随温度的增加而降低，并且黏度降低幅度随固化度的增加而增大。两种黏度影响机制分离的实现，为反应性树脂体系实时黏度的准确预测提供了技术支持。 |
| 关键词: 树脂体系 化学增黏机制 物理减黏机制 分离 |
| DOI： |
| 投稿日期：2009-03-30 |
| 基金项目:国家863计划资助项目(2007AA03Z563) |
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| Separation of Chemical Mechanism of Viscous Increase and Physical Mechanism of Viscous Falling for Reactive Resin System |
| DAI Xiaoqing, XIAO Jiayu, ZENG Jingcheng, JIANG Dazhi, BIAN Liping |
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(College of Aerospace and Materials Engineering, National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| The isothermal differential scanning calorimetry(DSC) method was used to determine the relationship between curing degree and time of a epoxy resin of CYD-128 with GA-327 as curing agent. An AR 2000EX rolling rheometer was used to measure the resin viscosity in a range of isothermal temperatures. Comparing the isothermal conversion-time relation with that of the isothermal viscosity-time, the isochronous relation of the isothermal viscosity-conversion was set up correspondingly. Results suggest that under the individual influence of the chemical mechanism of viscous increase, the viscosity of the resin system slowly increases with the increase of isothermal conversion, and then increases quickly when the conversion reaches a certain extent. Changing the isothermal viscosity-conversion relation to the relation of viscosity-temperature under the constant conversion, it shows that under the individual influence of the physical mechanism of viscous falling, the resin viscosity decreases with the temperature increased, and the viscosity descendent extent of the resin system increases with the conversion increased. These two mechanisms are separated from each other, which is the technical base of the accurate prediction for the reactive resin system. |
| Keywords: resin system chemical mechanism of viscous increase physical mechanism of viscous falling mechanism separation |
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