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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

1
, 1
, 2
 and 1,*
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 Mn values of the obtained HBPA increased in proportion to the [1]0/[2b]0 ratio from 7 to 46 (Mn = 3810–18600), retaining a narrow molecular weight distribution (Mw/Mn = 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 hyperbranched polymer; chain-growth condensation polymerization; LCST; thermally responsive polymer
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Ohta, Y.; Kamijyo, Y.; Yokoyama, A.; Yokozawa, T. Synthesis of Well-Defined, Water-Soluble Hyperbranched Polyamides by Chain-Growth Condensation Polymerization of AB2 Monomer. Polymers 2012, 4, 1170-1182.

AMA Style

Ohta Y, Kamijyo Y, Yokoyama A, Yokozawa T. Synthesis of Well-Defined, Water-Soluble Hyperbranched Polyamides by Chain-Growth Condensation Polymerization of AB2 Monomer. Polymers. 2012; 4(2):1170-1182.

Chicago/Turabian Style

Ohta, Yoshihiro; Kamijyo, Yusuke; Yokoyama, Akihiro; Yokozawa, Tsutomu. 2012. "Synthesis of Well-Defined, Water-Soluble Hyperbranched Polyamides by Chain-Growth Condensation Polymerization of AB2 Monomer." Polymers 4, no. 2: 1170-1182.


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