不飽和聚酯樹脂硬化反應之動態研究
碩士 === 元智大學 === 化學工程研究所 === 88 === Unsaturated polyester is one of the important resins for composite materials,but the study of its curing behavior almost nill. In this study we report the measurements of dynamic light scattering(DLS) and dynamic vicoelasticity on unsaturated polyester/s...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2000
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| Online Access: | http://ndltd.ncl.edu.tw/handle/64979743597722256402 |
| Summary: | 碩士 === 元智大學 === 化學工程研究所 === 88 === Unsaturated polyester is one of the important resins for composite materials,but the study of its curing behavior almost nill. In this study we report the measurements of dynamic light scattering(DLS) and dynamic vicoelasticity on unsaturated polyester/styrene system at various degree curing through the sol-gel transition.
The degree of conversion at various curing stages were measured by differential scanning calorimetry(DSC). The measurerments have been carried out on both the polarized and depolarizedlight scattered. The polarized DLS data revealed that two mode of relaxation whilst only one mode of relaxation was obtained in depolarized DLS data. However, the experimental results indicated that the depolarized correlation function was independent on the degree of curing. The scattered light that we detect in polarized scattering consisted of the concentraion fluctuation,density fluctuation, and isotropic fluctuation and results from isotropic fluctuation in depolarized scattering.
The results of viscoelastic measurements indicated that at sol-gel transitional G’() and G”() proportional to the frequency with the same exponent n.
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