NMR STUDY OF GRAFTING POLYSTYRENE ON LOW MOLECULAR WEIGHT POLYBUTADIENE IN THERMAL POLYMERIZATION

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ZIAEI FARSHID; SALEHI MOBARAKEH H.; NEKOU MANESH M.; ARABI HASAN

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Journal Paper

Paper Information

Journal: Iranian Polymer Journal Year:2008 | Volume:17 | Issue:5 Page(s): 379-388

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Title

NMR STUDY OF GRAFTING POLYSTYRENE ON LOW MOLECULAR WEIGHT POLYBUTADIENE IN THERMAL POLYMERIZATION

Author(s)

ZIAEI FARSHID | SALEHI MOBARAKEH H. | NEKOU MANESH M. | ARABI HASAN | Issue Writer Certificate

Keywords

GRAFTING

STYRENE

POLYBUTADIENE

THERMAL POLYMERIZATION

NMR

Abstract

In this study STYRENE was thermally polymerized by solution method in the presence of low molecular weight POLYBUTADIENEs (PBDs) at 100, 175, 250°C. Two types of PBD with various contents of 1,2-vinyl and cis/trans isomers were employed. Using PBDs of low molecular weight allowed the study of GRAFTING mechanisms by soluble grafted products obtained for liquid nuclear magnetic resonance (NMR) characterization.The effect of polymerization temperature and the type of POLYBUTADIENE on GRAFTING degree were investigated. It is shown that GRAFTING of polystyrene (PS) on PBD increases with increasing 1,2-vinyl content and temperature of polymerization.Accordingly, PBD with high 1,2-vinyl content and polymerization at 250°C gave the highest GRAFTING efficiency. However, GRAFTING was identical for cis and trans isomers in 1,4-PBD. Liquid 13C{1H}NMR spectroscopy using distortion enhancement by polarization transfer (DEPT) techniques were performed and a mechanism of GRAFTING was proposed based on addition reaction with reducing the unsaturated olefinic double bonds without formation of any quaternary olefinic or aliphatic carbons. With quantitative analysis of triad sequences of 1,2-PBD methylene carbon before and after GRAFTING, it was shown that polystyrene chains mainly graft on syndiotactic sequences of 1,2 PBD.

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APA: Copy

ZIAEI, FARSHID, SALEHI MOBARAKEH, H., NEKOU MANESH, M., & ARABI, HASAN. (2008). NMR STUDY OF GRAFTING POLYSTYRENE ON LOW MOLECULAR WEIGHT POLYBUTADIENE IN THERMAL POLYMERIZATION. IRANIAN POLYMER JOURNAL (ENGLISH), 17(5), 379-388. SID. https://sid.ir/paper/539224/en

Vancouver: Copy

ZIAEI FARSHID, SALEHI MOBARAKEH H., NEKOU MANESH M., ARABI HASAN. NMR STUDY OF GRAFTING POLYSTYRENE ON LOW MOLECULAR WEIGHT POLYBUTADIENE IN THERMAL POLYMERIZATION. IRANIAN POLYMER JOURNAL (ENGLISH)[Internet]. 2008;17(5):379-388. Available from: https://sid.ir/paper/539224/en

IEEE: Copy

FARSHID ZIAEI, H. SALEHI MOBARAKEH, M. NEKOU MANESH, and HASAN ARABI, “NMR STUDY OF GRAFTING POLYSTYRENE ON LOW MOLECULAR WEIGHT POLYBUTADIENE IN THERMAL POLYMERIZATION,” IRANIAN POLYMER JOURNAL (ENGLISH), vol. 17, no. 5, pp. 379–388, 2008, [Online]. Available: https://sid.ir/paper/539224/en

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