Synthesis of benzoin end-chain functional macrophotoinitiator of poly(d,l-lactide) homopolymer and poly(ε-caprolactone)-poly(d,
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- 作者：Mustafa Degirmenci ; Nalan Benek ; Mustafa Durgun
- 关键词：Poly(d ; l ; lactide) ; Poly(ε ; caprolactone) ; Ring ; opening polymerization (ROP) ; Macrophotoinitiator ; Photoinduced polymerization ; Diblock copolymer
- 刊名：Polymer Bulletin
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：74
- 期：1
- 页码：167-181
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Polymer Sciences; Soft and Granular Matter, Complex Fluids and Microfluidics; Characterization and Evaluation of Materials; Physical Chemistry;
- 出版者：Springer Berlin Heidelberg
- ISSN：1436-2449
- 卷排序：74
文摘
Benzoin (B) end-chain functional macrophotoinitiator of poly(d,l-lactide) homopolymer (B-PDLLA) and poly(ε-caprolactone)-poly(d,l-lactide) (B-PCL-b-PDLLA) diblock copolymer with controlled molecular weights and low polydispersities have been synthesized via ring-opening polymerization (ROP). The ROP of d,l-lactide with benzoin as the initiator and tin octoate (Sn(Oct)2) as the catalyst in bulk at 130 °C formed B-PDLLA polymer. B-PCL-b-PDLLA was synthesized by sequential ROP in two steps. Benzoin (B) end-chain functional macrophotoinitiator of poly(ε-caprolactone) (B-PCL) was first prepared via ROP of ε-caprolactone by using benzoin/Sn(Oct)2 initiating system. The resultant hydroxyl-terminated B-PCL macrophotoinitiator was subsequently utilized as the macroinitiator in the second-step ROP of d,l-lactide to synthesize B-PCL-b-PDLLA. The 1H NMR, FT-IR, GPC, UV, and fluorescence spectroscopic studies revealed that low-polydispersity poly(d,l-lactide) homopolymer and poly(ε-caprolactone)-poly(d,l-lactide) diblock copolymer with benzoin end-groups were obtained. These macrophotoinitiators were used as prepolymers in photoinitiated free radical promoted cationic polymerization for obtaining AB type di- and ABC type tri-block copolymers.