Chap._500004 - and also proton acceptors They have too...

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Long chain branching Small quantity of chain transfer to polymer also takes place to produce long chain branching in PVC molecular structure, which contains very undesirable tertiary Cl Cl CH 2 -C Cl PVC CH 2 =CHCl chain transfer to polymer * Cl Cl CH 2 -CH CH 2 -CH 2 -Cl CH 2 -CH CH 2 -C* PVC Properties In the past, most PVC has been used in a plasticized form (flexible PVC), unplasticized PVC now accounts for about 60% of the current consumption of the polymer. This change has come about largely through the development of better stabilizing systems . Plasticizers for PVC are non-volatile solvents which have solubility parameters similar to that of PVC
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Unformatted text preview: and also proton acceptors. They have too large a molecular size to dissolve the polymer at room temperature but they may be incorporated at elevated temperatures to give mixtures stable at room temperature. Most common plasticizers for PVC include alkylphthalates, aryl phosphates, expoxidized oils. Generally, 40-60 parts of plasticizer per 100 parts of polymer are used for most common applications epoxidized vegetable oi O n O C C-(CH 2 ) -C-O-R tritotyl phosphate O O O P diisooctyl phthalates O O-C-O-R R-O-C-...
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