Synthesis, characterization, and thermal stability of star-shaped poly(ε-caprolactone) with phosphazene core

被引：32
作者：
Cui, YJ [1 ]
Ma, XM [1 ]
Tang, XZ [1 ]
Luo, YP [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Chem & Chem Technol, State Key Lab Composite Mat, Shanghai 200240, Peoples R China
来源：
EUROPEAN POLYMER JOURNAL | 2004年 / 40卷 / 02期
关键词：
star polymers; phosphazene; ring-opening polymerization; thermal stability;
D O I：
10.1016/j.eurpolymj.2003.09.024
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Hexakis[p-(hydroxylmethyl)phenoxy]cyclotriphosphazene was synthesized by the reaction of hexachlorocyclotriphosphazene with the sodium salt of 4-hydroxybenzaldehyde and subsequent reduction of aldehyde groups to alcohol groups by using sodium borohydride. This compound was employed in initiating the ring-opening polymerization of epsilon-caprolactone. The resulting polymers were characterized using Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), and gel permeation chromatography (GPC). The characterization data indicated the star-shaped PCL with phosphazene core were successfully synthesized with narrow molecular weight distribution and high yields. H-1-NMR analysis was used to calculate the number-average molecular weight. The calculated result from NMR was closer to the theoretical data than that from GPC analysis. Polarizing optical microscopy (POM) combined with differential scanning calorimetry (DSC) was used to study the crystallization behavior of the star-shaped PCL. The result indicated that the highly branched architecture of star-shaped PCL resulted in interrupted crystallization form and subsequently lower melting temperature. Thermogravimetric analysis (TGA) carried out on the star-shaped PCL suggested that introduction of phosphazene rings strengthen the thermal stability of the resulting polymers. (C) 2003 Elsevier Ltd. All rights reserved.
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页码：299 / 305
页数：7
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