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- W1994773729 abstract "Some basic birefringence effects in a PVC homopolymer have been investigated as a function of temperature, stress or strain level, and plasticizer content. The behavior of the stress-optical coefficient (SOC) has been investigated over a broad temperature range extending down to liquid-nitrogen temperature for both unplasticized polymer and polymer containing weight fractions of 0.1, 0.3, and 0.5 dioctyl phthalate (DOP), 0.3 dioctyl adipate (DOA), and 0.3 tricresyl phosphate (TCP). The SOC of unplasticized PVC is negative below the glass transition and shows a sign change to large positive values above the glass transition. This progressive change from negative to positive values is also observed when stress level is increased in the glassy state below Tg, or when plasticizer content is progressively increased. The SOC goes to large positive values above Tg for all plasticized polymers. A positive SOC can therefore be considered characteristic of rubbery state behavior of PVC, and a positive sign will consequently be characteristic of orientation birefringence as well. Orientation birefringence increases with increasing temperature in all cases; however, its temperature coefficient (fractional change per °C) is strongly dependent on both plasticizer content and plasticizer type. The theoretical significance of these results is discussed." @default.
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- W1994773729 date "1968-10-01" @default.
- W1994773729 modified "2023-10-16" @default.
- W1994773729 title "Birefringence Effects in Unplasticized and Plasticized Polyvinyl Chloride" @default.
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- W1994773729 doi "https://doi.org/10.1063/1.1655882" @default.
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