Highly Branched Poly(α-Methylene-γ-Butyrolactone) from Ring-Opening Homopolymerization

• 作者: Dechristian Guthrie Pascal Binda Rasaan Ford Zakiya Barnes
• 来源期刊: 高分子化学期刊(英文)
• 学科: 化学
• 关键词: LANTHANIDE α-Methylene-γ-Butyrolactone Polyesters RING-OPENING POLYMERIZATION
• 年，卷（期）: 2017,（4）
• 页码范围: 76-91
• 页数: 16页
• 分类号: O6

摘要

New heteroleptic lanthanide complex [L1ILaN{Si(CH3)2}] (1) containing tridentate [ONO] ancillary ligand was synthesized from an acid-base ligand exchange reaction with ligands H2L1 and corresponding homoleptic lanthanide compound La[N{Si(CH3)3}2]3. Meanwhile, dimeric complexes [L1LaCl] (2) and [L1ILaCl] (3) were prepared from salt metathesis reaction between one equivalent of ligands H2LI,II, three equivalent of NaN{Si(CH3)3}2, and one equivalent of LaCl3. These compounds were characterized by nuclear magnetic resonance (300 MHz) and elemental analysis. These complexes were used as catalysts in the ring-opening homopolymerization of α-methylene-γ-butyrolactone. While compound 1 did not show any significant reactivity, compounds 2 and 3 gave significant amount of highly branched poly(α-methylene-γ-butyrolactone) as confirmed by 1H NMR spectroscopy and Malvern’s triple detector GPCMax analysis in DMSO with molecular weights of over 500,000 Dalton. The glass-transition temperatures of the branched polymer samples were determined using a Dynamic Mechanical Analyzer, DMA Q800.