The two parameter theories, being based on Gaussian chain statistics require that when a=l, the quantity Y and A2 should approach zero. However, the experimental behaviour is different and unexplainable in PVP-Methanol system. For low molecular weight i.e. M<105 in case of PVP, mutually consistent relationships for 'l' and a based on two parameter theories cannot reproduce experimental results. It also fails to describe completely the experimental behaviour of short chains in good solvents.
SHUMAILA BASHIR ,SHAKIR ULLAH ,A SAEED ,BASHIR AHMAD ,
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