Grafting of maleic anhydride onto styrene-butadiene-styrene triblock copolymer using supercritical CO2 as a swelling agent

• Published in: Journal of applied polymer science Vol. 102; no. 5; pp. 4425 - 4429
• Main Authors: Li, Chunsheng, Zhang, Shuxiang, Zheng, Anna, Kong, Xiangzheng, Geng, Bing
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 05-12-2006; Wiley
• Subjects: Applied sciences; Copolymerization; Exact sciences and technology; grafting; maleic anhydride; Organic polymers; Physicochemistry of polymers; Preparation, kinetics, thermodynamics, mechanism and catalysts; styrene-butadiene-styrene triblock copolymer; supercritical carbon dioxide; maleic anhydride; Graft copolymer; SBS; Conversion rate; Carbon dioxide; styrene-butadiene-styrene triblock copolymer; Thermoplastic rubber; Solution copolymerization; Experimental study; Grafting; Triblock copolymer; supercritical carbon dioxide; Supercritical solvent; Maleic anhydride copolymer; Processing parameter; Kinetics
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.24314

Grafting of maleic anhydride (MA) onto styrene–butadiene–styrene triblock copolymer (SBS) was carried out by free radical polymerization using supercritical carbon dioxide (SC CO2) as a solvent of MA and swelling agent of SBS. The effect of various factors such as monomer concentration, initiator concentration, SC CO2 pressure, and reaction time on grafting ratio was studied. SBS and the product (SBS‐g‐MA) were characterized by Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). GPC data showed that the molecular weight of SBS‐g‐MA is bigger than that of SBS. DSC testing indicated that the glass transition temperature (Tg) of SBS‐g‐MA is higher than that of SBS. By SEM photo, we can observe that some particles which contain more oxygen atom grew out from the surface of SBS‐g‐MA when grafting ratio reached at 5.6%, and the amount and diameter of particles increased with increasing of grafting ratio. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4425–4429, 2006