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The Monte-Carlo (MC) approach of Paper I is developed to predict the birefringence of PET. An extension of the modelling of polarisability is used that accounts for chain flexibility and for structural units containing several types of bonds. The rotational-isomeric-state (RIS) model for PET chains in melts is employed to calculate the polarisability of the terephthaloyl segment and of each of the...
Experimental measurements and Monte-Carlo (MC) modelling of the birefringence–strain, stress–strain and stress–optical behaviour of poly(ethylene terephthalate) (PET) are used, together with the analysis of orientation–strain and conformation–strain behaviour reported in Paper I, to give a detailed, quantitative interpretation and characterisation of its deformation-related properties. The difference...
Quantitative infra-red data on oriented poly(ethylene terephthalate) (PET) films have been used to determine the changes in the proportions of the trans and gauche conformers of the glycol residues and the development of molecular orientation of the terephthaloyl groups as functions of draw ratio. The results are compared with predictions for the stretching of a rubber-like network based on rotational-isomeric-state...
SummaryGel points, accounting for intramolecular reaction, are predicted using Ahmed-Rolfes-Stepto (ARS) theory. They are compared with experimental gel points for polyester (PES)-forming, polyurethane (PU)-forming and poly(dimethylsiloxane) (PDMS) polymerisations. The PES and PU polymerisations were from stoichiometric reaction mixtures at different initial dilutions and the PDMS ones were from critical-ratio...
It is demonstrated that experimental stress–strain data for several types of polymer network under pure shear display an approximately universal behaviour. The Monte–Carlo network-modelling method of Stepto, Taylor and Cail is extended to treat stress–strain behaviour in pure shear and its predictions are in good agreement with the experimental data. The predictions of Gaussian network theory are...
The Monte-Carlo (MC) method developed to model the elastomeric stress-strain behaviour of polyethylene (PE), poly(dimethyl siloxane) (PDMS) and poly(ethylene terephthalate) (PET) networks and the stress-optical behaviour of PE networks is now developed to investigate further the stress-strain behaviour of PET networks. Accurate infrared (IR) spectrometry measurements have been used to determine the...
The Monte-Carlo (MC) method developed to model the elastomeric stress–strain behaviour of polyethylene (PE) and poly(dimethyl siloxane) (PDMS) networks and the stress–optical behaviour of PE networks is now applied to the stress–strain behaviour of poly(ethylene terephthalate) (PET) networks. In keeping with the previous results for PE and PDMS networks, increases in the proportions of fully extended...
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