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| Thesis Name： |
The progress in study of melt copolycondensation of poly(ethylene terephthalate)—effect of chemical structure of comonomers on properties and applications |
| Usage： |
chemistry |
| Keyword： |
PET; copolyesters; structure; properties; applications |
| Remarks： |
Abstract: This article review the research works published in recent years. The effect of chemical structure of comonomers on properties and applications of PET copolyester is described. Two kinds of structure of comonomeric units are considerated: flexible and rigid. Comonomers including flexible and rigid all disturb the regularity of PET macromolecular chain, so the acting force between moleculars of PET is decreased, as a result the melt temperatureθm decreased.All flexible comomers are favour of movement of chain segment, so theθg of this kind of copolyesters decreases. The flexible comonomers promote the crystallization of obtained copolyester, so the crystallization rate increases. The crystallization rate of copolyesters obtained from substituted glycols decreases due to hindered effect of substituted groups. The θg of a great majority of copolyesters obtain from rigid comonomeric units increases. The crystallization rate of all copolyesters from rigid units decreases, even amorphous structure can be obtained. The copolyesters with different properties can be used in different applications.
Source:POLYESTER INDUSTRY
Author:WU Rong-rui(The Material institute of Beijing Institute of Clothing Technology, Beijing 100029,China) |
| Original file： |
No File
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