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A detailed chromatographic investigation has been carried out on the influence of triphenyl phosphite addition in molten poly(ethylene terephthalate) or poly(ethylene terephthalate)/poly(butylene terephthalate) blends. The observed molecular weight evolution corresponds to torque and viscosity observations and fully confirms the occurrence of high temperature reactions between polyester and phosphite...
The addition of phosphite during melt processing of polyester leads to the creation of two different types of linkages: ester bonds and bonds including phosphorus atoms. The influence of different parameters on these reactions has been investigated. Experiments carried out with different grades of poly(ethylene terephthalate) show that variables such as total concentration of reactive end-groups and...
The influence of triphenyl phosphite addition in molten poly(ethylene terephthalate) or poly(ethylene terephthalate)/poly(butylene terephthalate) blends has been investigated. Torque measurements during polyester processing and corresponding intrinsic viscosity values confirm an expected chain extension. Chromatographic results similarly indicate a molecular-weight increase. The precise nature...
The performance of a chromatographic technique for polyester analysis at a moderate temperature was investigated. Sample dissolution at room temperature in phenol-1,1,2,2-tetrachloroethane (TCE) and analysis at 70°C in m-cresol, despite the efficiency for pure polyesters, proved to be inadequate for molecular mass determination of polyester/phosphite systems since it causes a rapid degradation of...
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