作者介绍了基于聚乙二醇(PEG)的大分子单体,该单体包含酸不稳定的缩酮部分以及适合自由基聚合的甲基丙烯酸酯末端单元。具有中心缩酮单元(PEG-缩酮-二醇)的不同分子量(范围从2000到13000 g mol -1,多分散度<1.15)的PEG的合成及其转化为PEG-缩酮-二甲基丙烯酸酯(PEG-缩酮- DMA)介绍。PEG-缩酮-二醇和PEG-缩酮-DMA的降解率均采用原位法1在氘化磷酸盐缓冲液中的1 H NMR动力学研究。分别合成了含有0、5或10 wt%的PEG-ketal-DMA和100、95或90 wt%的PEG-DMA的水凝胶,并在不同pH值的缓冲液中研究了凝胶的崩解。对于含有PEG-ketal-DMA的水凝胶,在pH 5时会出现凝胶的明显崩解,而在中性pH或不含PEG-ketal-DMA的PEG水凝胶中均未观察到可见的降解。
Synthesis, Characterization, and Biocompatibility of Biodegradable Hyperbranched Polyglycerols from Acid-Cleavable Ketal Group Functionalized Initiators
作者:Rajesh A. Shenoi、Benjamin F. L. Lai、Jayachandran N. Kizhakkedathu
DOI:10.1021/bm300959h
日期:2012.10.8
Herein we report the synthesis of biodegradable hyperbranchedpolyglycerols (BHPGs) having acid-cleavable core structure by anionic ring-opening multibranching polymerization (ROMBP) of glycidol using initiators bearing dimethyl and cyclohexyl ketal groups. Five different multifunctional initiators carrying one to four ketal groups and two to four hydroxyl groups per molecule were synthesized. The