Curing behaviour of unsaturated polyester resins based on recycled poly(ethylene terephthalate) (RPET): effects of RPET content and glycol type
✍ Scribed by Lee, Dai Soo; Lee, Soo Hyoung; Kim, Ju Hyun
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 381 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0959-8103
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✦ Synopsis
Curing behaviour of unsaturated polyester (UPE) resins based on recycled poly(ethylene terephthalate) (RPET) was investigated by measuring exotherms during cure employing di †erential scanning calorimetry. The UPE resins were prepared by glycolysis of RPET and polycondensation of the glycolysis product with maleic anhydride. In the preparation of the UPE resins, RPET content and glycol type were varied. The curing behaviour of the UPE resins based on RPET was similar to that of conventional UPE resins. The rate of cure increased with increasing RPET content of the UPE resin based on propylene glycol (PG) and RPET. It decreased with increasing RPET content of the UPE resin based on dipropylene glycol (DPG) and RPET. The Ðnal degree of isothermal cure increased with increasing RPET content, or changing the glycol type from PG to DPG, in the UPE resins. The curing behaviour was interpreted from the viewpoints of change in double bond concentration, inherent reactivity, and styrene/fumarate ratio of the UPE resins. Polym. Int. 44, 143È148 (1997) No. of Figures : 6. No. of Tables : 4. No. of References : 14 Key words : curing, unsaturated polyester, glycolysis, recycled poly(ethylene terephthalate) * To whom all correspondence should be addressed.
information on the relationship between molecular structure and curing behaviour of the UPE resins based on RPET.
Curing behaviour of UPE resins has been studied by many researchers based on the exothermic heat of cure.3h7 The curing reaction was reported to be a di †usion-controlled free radical polymerization and a mechanistic model was proposed by Stevenson.8 Han & Lee showed the mechanistic model was useful, especially for predicting curing behaviour of UPE resins with different initiator mixtures.9
Paul et al. reported that the physical properties of polymer mortar using UPE resins based on RPET were