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• Kamijyo, Y
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Polymers 2012, 4(2), 1170-1182; doi:10.3390/polym4021170

Article

Synthesis of Well-Defined, Water-Soluble Hyperbranched Polyamides by Chain-Growth Condensation Polymerization of AB₂ Monomer

Yoshihiro Ohta ¹ , Yusuke Kamijyo ¹ , Akihiro Yokoyama ²  and Tsutomu Yokozawa ^1,*

¹ Department of Material and Life Chemistry, Kanagawa University, Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan ² Department of Material and Life Science, Seikei University, Kichijoji-Kitamachi, Musashino-shi, Tokyo 180-8633, Japan

* Author to whom correspondence should be addressed.

Received: 12 March 2012; in revised form: 18 April 2012 / Accepted: 8 May 2012 / Published: 14 May 2012

(This article belongs to the Special Issue Living Polymerization Techniques)

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Abstract: Condensation polymerization of 5-aminoisophthalic acid methyl ester 1 bearing a N-tri(ethylene glycol) methyl ester (TEG) chain as an AB₂ monomer was conducted and the properties of the resulting hyperbranched polyamides (HBPA) were investigated. When the polymerization of 1 was carried out with N-methyl core initiator 2b at various feed ratios of 1 to 2b ([1]₀/[2b]₀) in the presence of LiHMDS and LiCl at −10 °C, the M_n values of the obtained HBPA increased in proportion to the [1]₀/[2b]₀ ratio from 7 to 46 (M_n = 3810–18600), retaining a narrow molecular weight distribution (M_w/M_n = 1.11–1.19). The HBPA was soluble in water, and a 0.25 wt.−% aqueous solution of the HBPA exhibited a lower critical solution temperature (LCST). The cloud point was 21–23 °C, which is about 30 °C lower than that of the corresponding poly(m-benzamide) with the N-TEG unit.

Keywords: hyperbranched polymer; chain-growth condensation polymerization; LCST; thermally responsive polymer

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