Synergetic effect of multi-site phase transfer catalysis system mediated free radical polymerization of acrylonitrile – a kinetic study
Publish place: Chemical Review and Letters، Vol: 2، Issue: 1
Publish Year: 1398
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_CHRL-2-1_006
تاریخ نمایه سازی: 6 شهریور 1402
Abstract:
In this work, the kinetics and mechanism of free radical polymerization of acrylonitrile (AN) using potassium peroxydisulphate (PDS-K۲S۲O۸) as a water soluble initiator in the presence of synthesized ۴,۴'-dihexadecyl-۱,۱'-bipyridine diiumdichloride (DHBPDDC) as multi-site phase-transfer catalyst (MPTC) has been investigated. The polymerization reaction were carried out under nitrogen atmosphere and unstirred condition at constant temperature ۶۰+۱°C in ethyl acetate/water biphasic medium. The effects of variation of monomer(AN), initiator(PDS) and catalyst(MPTC) solvent polarity and temperature on the rate of polymerisation (Rp) were ascertained. The order with respect to monomer(acrylonitrile) was found to be unity. The order with respect to initiator and catalyst was found to be ۰.۵۱, ۰.۴۸ respectively. However, an increase in the polarity of the solvent has slightly increased the rate of polymerization value (Rp). Based on the results obtained, a suitable kinetic mechanism scheme has been proposed to account for the experimental observations and its significance was discussed. The other thermodynamic parameters such as entropy of activation ((∆S#), enthalpy of activation (∆H#) and free energy of activation (∆G#) have been calculated.
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Authors
Manickam Sathiyaraj
PG & Research, Department of Chemistry, Pachaiyappa’s College, Chennai, Tamil Nadu, India
Perumal Venkatesh
PG & Research, Department of Chemistry, Pachaiyappa’s College, Chennai, Tamil Nadu, India
Venugopal Rajendran
PG & Department of Chemistry, Pachaiyappa’s College for Men, Kanchipuram, Tamil Nadu, India - ۶۳۱ ۵۰۱
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