Abstract
AbstractSummary: Poly(vinyl chloride) (PVC) samples prepared at various temperatures have been submitted to a substitution reaction for purposes of selectively removing the GTTG–TT conformations of the mmr termini of long isotactic sequences. The physical ageing of all samples has been studied by means of differential scanning calorimetry techniques. Surprisingly, a straight relation between the loss of enthalpy and the above GTTG–TT content, which pass through a minimum, has been found. Such a novel relationship should further lead to better understanding of the reasons why polymeric materials experience nonequilibrium states which are known to cause physical ageing.Dependence of the area of the endothermic peak (Qt) on the degree of the substitution of PVC (sample X) in cyclohexanone solution.imageDependence of the area of the endothermic peak (Qt) on the degree of the substitution of PVC (sample X) in cyclohexanone solution.
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