Copolymerization of styrene and acrylonitrile with functional silanes

✍ Scribed by P. Bajaj; D.C. Gupta

• Publisher: Elsevier Science
• Year: 1979
• Tongue: English
• Weight: 277 KB
• Volume: 15
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(79)90175-7

✦ Synopsis

Styrene has been copolymerized to high conversions with vinylmethyl diacetoxysilanc (VMDAS) and vinylmethyldiethoxysilane {VMDES) in bulk and in toluene at 60 using azobisisobutyronitrile (AIBN) as initiator. Acrylonitrile has also been copolymerized with VMDAS at 50' in bulk using AIBN. The compositions of the copolymers were determined from the silicon contents: reactivity ratios were calculated by the Kelen-Tiid6s method. The reactivity ratio r t (styrene} is higher for styrene-VMDES than for styrene-VMDAS, indicating higher reactivity of VMDAS towards polystyryl radical. VMDAS was found to be more reactive towards the polyacrylonitrile than towards the polystyrene radical. The influences of the silicon comonomer on properties such as intrinsic viscosity, solubility. molecular weight distribution and thermal behaviour were also studied.

* Initiator--AIBN (1 mol%).

* lnitator--AIBN (0.5~, by weight on the basis of total monomers).