Synthesis and characterization of novel poly(α-methyl β-alanine-b-lactone)s through hydrogen-transfer and ring-opening polymerization

IF 1 Q4 CHEMISTRY, MULTIDISCIPLINARY
E. Çatıker, Songül Kirlak, M. Atakay, B. Salih
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引用次数: 0

Abstract

Abstract A series of novel poly(α-methyl β-alanine-b-lactone)s were prepared by a combination of hydrogen-transfer polymerization (HTP) of methacrylamide (MAm) and anionic ring-opening polymerization (AROP) of β-propiolactone (BPL), β-butyrolactone (BBL), and δ-valerolactone (DVL). For this purpose, poly(α-methyl β-alanine) (PmBA) having a living anionic end-group for a further extension was obtained via HTP of MAm. The anionic end-group on PmBA chains were used as initiation sites for AROP of BPL, BBL, and DVL. Fourier Transform Infrared Spectroscopy (FTIR) and Proton Nuclear Magnetic Resonance Spectroscopy (1H-NMR) confirmed the existence of both ester and α-methyl β-alanine (mBA) units in the final products. MALDI-MS analysis revealed that the poly(α-methyl β-alanine-b-lactone)s with average molar masses of several thousand g·mol−1 were obtained. DSC and TGA thermograms of each copolymer showed that the copolymers comprised the mBA and the corresponding ester units.
新型聚α-甲基β-丙氨酸-b-内酯的氢转移和开环聚合合成及表征
摘要采用甲基丙烯酰胺(MAm)的氢转移聚合(HTP)和β-丙内酯(BPL)、β-丁内酯(BBL)、δ-戊内酯(DVL)的阴离子开环聚合(AROP)相结合的方法制备了一系列新型聚α-甲基β-丙氨酸-b-内酯(α-甲基β-丙内酯)。为此,通过MAm的HTP得到了具有活性阴离子端基的聚α-甲基β-丙氨酸(PmBA)。PmBA链的阴离子端基被用作BPL、BBL和DVL的AROP起始位点。傅里叶变换红外光谱(FTIR)和质子核磁共振光谱(1H-NMR)证实了最终产物中存在酯和α-甲基β-丙氨酸(mBA)单元。MALDI-MS分析表明,得到的聚α-甲基β-丙氨酸-b-内酯平均摩尔质量为几千g·mol−1。各共聚物的DSC和TGA热图表明,共聚物由mBA和相应的酯单元组成。
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来源期刊
Ovidius University Annals of Chemistry
Ovidius University Annals of Chemistry CHEMISTRY, MULTIDISCIPLINARY-
自引率
11.10%
发文量
20
审稿时长
5 weeks
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