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http://dx.doi.org/10.7317/pk.2013.37.2.211

Synthesis and Characterization of Very High Molecular Weight Nylon 4 and Nylon 4/6 Copolymers  

Kim, Nam Cheol (School of Chemical Engineering, Sungkyunkwan University)
Kim, Ji-Heung (School of Chemical Engineering, Sungkyunkwan University)
Nam, Sung Woo (School of Chemical Engineering, Sungkyunkwan University)
Jeon, Boong Soo (School of Chemical Engineering, Sungkyunkwan University)
Yoo, Young-Tai (Department of Materials Chemistry and Engineering, Konkuk University)
Kim, Young Jun (School of Chemical Engineering, Sungkyunkwan University)
Publication Information
Polymer(Korea) / v.37, no.2, 2013 , pp. 211-217 More about this Journal
Abstract
Potassium tert-butoxide (t-BuOK) with $CO_2$ or benzoyl chloride (BzC) as a polymerization initiator system was used with crown ether or TMAC as catalyst to synthesize very high molecular weight nylon 4 homo- and copolymers by anionic ring opening polymerization. Effect of different amounts of catalyst, crown ether and TMAC on the polymerization was studied in terms of intrinsic viscosity, yield and thermal properties. By adding crown ether or TMAC, polymers with very higher intrinsic viscosity values were obtained in a high yield. It was possible to synthesize nylon 4 homopolymer with such a high intrinsic viscosity value of 6.36 dL/g. Crown ether was found to be more efficient in terms of intrinsic viscosity and polymer yields than TMAC. Thermal analysis confirmed that molecular weight effect on the thermal properties of both nylon 4 and nylon 4 copolymer was marginal.
Keywords
nylon 4; nylon 4/6; 2-pyrrolidone; crown ether; tetramethylammonium chloride; very high molecular weight;
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