Paper Information

Journal:   IRANIAN POLYMER JOURNAL (ENGLISH)   November-December 2003 , Volume 12 , Number 6; Page(s) 449 To 458.
 
Paper: 

DEVELOPMENT OF MESOMORPHIC POLY (METHYL METHACRYLATE)

 
 
Author(s):  SRIVASTAVA D.*
 
* Department of Plastic Technology, H.B. Technological Institute, Kanpur - 208 024 (U.P.), India
 
Abstract: 

Methacrylate monomers were synthesized in four steps based on methacrylic acid and substituted phenols have been prepared in the present investigation. In the first step, 4-(ω-hydroxy alkoxy) benzoic acid with ω=2 and 6 were synthesized with the reaction of 4-hydroxy benzoic acid (PHB) and ω-chloro alkanol. The products were refluxed with methacrylic acid for 20 h to obtain the products of the type 4-(ω-methacryloyloxy alkoxy) benzoic acid. The products were chlorinated with thionyl chloride to obtain 4-(ω-methacryloyloxy alkoxy) benzoyl chloride. Finally, the chlorinated products were reacted with 4-methoxy and 4-hexyloxy phenols in dry benzene with triethylamine as catalyst at 0-5°C in nitrogen atmosphere for 3 h to obtain the methacrylate monomers. These monomers have been polymerized by free-radical polymerization technique at 50-60°C. The viscosity-average molecular weight (MV) of the synthesized polymers was calculated by Mark-Houwink’s equation with K and a values 3.87 x 10-3 dL/g and 0.42, respectively. Finally, the phase transitions and the transition enthalpies of polymers from the dynamic scans by differential scanning calorimetric analysis (DSC) gave an inference about the presence of nematic-isotropic and smectic-isotropic transitions in polymers. These liquid crystalline orders were further confirmed by X-ray diffraction analysis.

 
Keyword(s): SUBSTITUTED BENZOIC ACID, SUBSTITUTED PHENOL, MESOMORPHIC POLY (METHYL METHACRYLATE), VISCOSITY-AVERAGE MOLECULAR WEIGHT, DIFFERENTIAL SCANNING CALORIMETRY, X-RAY
 
References: 
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