Physical and mechanical properties of photopolymerized SBS–methacrylic monomer systems

✍ Scribed by J. L. Mateo; M. Calvo; P. Bosch

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 123 KB
• Volume: 89
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.12525

✦ Synopsis

Abstract

An exploratory study on physical and mechanical properties—transmittance, pendulum hardness, dynamic‐mechanical, and tensile—of photopolymerized styrene–butadiene–styrene block copolymer (SBS)–methacrylic monomer systems at different compositions was carried out. The insoluble and crosslinked polymerized systems prepared exhibit a high transmittance along the visible light region and retain the regular structure corresponding to the matrix (SBS), that is, the dynamic‐mechanical spectra show the two peaks corresponding to the PS and PB phases in the tan δ–temperature plot. Trapped radicals remain in the photopoymerized SBS–methacrylic monomer (tetra or hexafunctional) system, so when these systems are heated above their vitreous transition temperature, a postpolymerization reaction is produced that gives rise to an increase of both the crosslinking density and the storage modulus. The modulus and ultimate tensile strength of the polymerized SBS–hexanediol dimethacrylate (HDDMA) systems increase with increasing initial proportions of the dimethacrylate monomer; on the contrary, the percent elongation at break and toughness decrease with increasing proportions of initial dimethacrylate monomer. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 2857–2864, 2003