GRAFT COPOLYMERIZATION OF STYRENE ONTO POLY (VINYL ALCOHOL) INITIATED BY POTASSIUM DIPERIODATOCUPRATE (III)

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BAI L.; WANG CH.; JIN J.; LIU Y.

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Journal Paper

Paper Information

Journal: Iranian Polymer Journal Year:2009 | Volume:18 | Issue:11 (113) Page(s): 847-855

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Title

GRAFT COPOLYMERIZATION OF STYRENE ONTO POLY (VINYL ALCOHOL) INITIATED BY POTASSIUM DIPERIODATOCUPRATE (III)

Author(s)

BAI L. | WANG CH. | JIN J. | LIU Y. | Issue Writer Certificate

Keywords

POTASSIUM DIPERIODATOCUPRATE

POLY(VINYL ALCOHOL)

STYRENE

GRAFT COPOLYMER

REDOX SYSTEM

Abstract

The GRAFT COPOLYMERization of STYRENE (St) onto poly(vinyl alcohol) (PVA) is studied by using a novel REDOX SYSTEM of POTASSIUM DIPERIODATOCUPRATE-PVA (Cu(III)-PVA) in alkaline medium. Cu(III)-PVA redox pair is an efficient initiator for this GRAFT COPOLYMERization which is proved by high graft efficiency (>97%) and high percentage of graft (>300%). Reaction conditions (monomer-to-PVA weight ratio, initiator concentration, pH, time and temperature) affect the graft parameters which have been investigated systematically. The optimum reaction conditions are found as St/PVA = 5.4, [Cu(III)] = 1×10-2 M, pH = 12.7, temperature = 50oC, time = 3.5 h. Further, the equation of the overall polymerization rate can be written as follows: Rp = k C1.9 (St) C1.7 (Cu(III)). The overall activation energy was calculated to be 42.0 kJ/mol based on the experimental data of the relations between Rp and C(St), Rp and C(Cu(III)), and Rp and temperature. A mechanism is proposed to explain the formation of radicals and the initiation. The structure of the GRAFT COPOLYMERs is confirmed by Fourier transfer infrared spectroscopy (FTIR). Some peaks were compared with PVA at 3080.34-3001.79 cm-1 (=C-H stretching in the phenyl ring), 1600.34-1450.95 cm-1 (C=C stretching in the phenyl ring), 755.17 cm-1 and 698.64 cm-1 (=C-H out-off-plane bending in phenyl ring) which are considered to belong to the characteristic absorption bands of phenyl group of polystyrene. Therefore it proves that the GRAFT COPOLYMER is composed of PVA and PSt. TGA thermograms of PVA and PVA-g-PSt are investigated as well. As it is shown the initial decomposition temperature of PVA-g-PSt (377.3oC) is much higher than that of PVA (241.8oC), which indicates that the thermal stability of the PVA is obviously enhanced by grafting with PSt. X-Ray diffraction elucidates the incorporation of PSt with PVA which reduces the crystal degree of PVA.

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APA: Copy

BAI, L., WANG, CH., JIN, J., & LIU, Y.. (2009). GRAFT COPOLYMERIZATION OF STYRENE ONTO POLY (VINYL ALCOHOL) INITIATED BY POTASSIUM DIPERIODATOCUPRATE (III). IRANIAN POLYMER JOURNAL (ENGLISH), 18(11 (113)), 847-855. SID. https://sid.ir/paper/563596/en

Vancouver: Copy

BAI L., WANG CH., JIN J., LIU Y.. GRAFT COPOLYMERIZATION OF STYRENE ONTO POLY (VINYL ALCOHOL) INITIATED BY POTASSIUM DIPERIODATOCUPRATE (III). IRANIAN POLYMER JOURNAL (ENGLISH)[Internet]. 2009;18(11 (113)):847-855. Available from: https://sid.ir/paper/563596/en

IEEE: Copy

L. BAI, CH. WANG, J. JIN, and Y. LIU, “GRAFT COPOLYMERIZATION OF STYRENE ONTO POLY (VINYL ALCOHOL) INITIATED BY POTASSIUM DIPERIODATOCUPRATE (III),” IRANIAN POLYMER JOURNAL (ENGLISH), vol. 18, no. 11 (113), pp. 847–855, 2009, [Online]. Available: https://sid.ir/paper/563596/en

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