β-丁内酯和γ-丁内酯使用钇胺双（酚盐）催化剂的共聚,Polymer International

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β-丁内酯和γ-丁内酯使用钇胺双（酚盐）催化剂的共聚
Polymer International ( IF 2.9 ) Pub Date : 2022-05-24 , DOI: 10.1002/pi.6429
Pip Catchpole _{1,

2} , Rachel H. Platel _{1,

2}

Affiliation

聚(3-羟基丁酸酯-共-4-羟基丁酸酯)的合成是用一系列钇胺双(酚)催化剂通过β-丁内酯和γ-丁内酯的开环聚合报道的。聚(3-羟基丁酸酯)、聚(4-羟基丁酸酯)和聚(3-羟基丁酸酯-共-4-羟基丁酸酯)在-40°C下用10 mol L ^-1制备使用一系列胺双（酚盐）催化剂的单体浓度。发现在这些条件下聚(3-羟基丁酸酯)合成不如在室温下可达到的。相比之下，聚 (4-羟基丁酸酯) 合成在这些条件下实现了高达 33% 的转化率。当β-丁内酯和γ-丁内酯在单体进料中过量的γ-丁内酯共聚时，获得了含有高达 63% 的 4-羟基丁酸酯的聚（3-羟基丁酸酯）聚合物。¹³中 169 和 174 ppm 之间的羰基共振指定了该共聚物的 C NMR 光谱。共聚物的凝胶渗透色谱表明，数均分子量始终大于计算值，分散度通常大于 1.4，表明催化剂控制有限。尽管有这种受限的控制，但这些催化剂能够单独或在共聚过程中将大量单体转化为聚合物。© 2022 作者。Polymer International由 John Wiley & Sons Ltd 代表工业化学学会出版。

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Copolymerisation of β-butyrolactone and γ-butyrolactone using yttrium amine bis(phenolate) catalysts

The synthesis of poly(3-hydroxbutyrate-co-4-hydroxybutyrate) is reported with a family of yttrium amine bis(phenolate) catalysts via ring-opening polymerisation of β-butyrolactone and γ-butyrolactone. Poly(3-hydroxybutyrate), poly(4-hydroxybutyrate) and poly(3-hydroxybutyrate-co-4-hydroxybutyrate) were prepared at −40 °C with a 10 mol L⁻¹ monomer concentration using a range of amine bis(phenolate) catalysts. It was found that poly(3-hydroxybutyrate) synthesis is inferior under these conditions to that attainable at room temperature. In contrast, poly(4-hydroxybutyrate) synthesis achieved up to 33% conversion under these conditions. Poly(3-hydroxybutyrate) polymers containing up to 63% 4-hydroxybutyrate inclusion were obtained when β-butyrolactone and γ-butyrolactone were copolymerised, with γ-butyrolactone in excess in the monomer feed. The carbonyl resonances between 169 and 174 ppm in the ¹³C NMR spectra of this copolymer were assigned. Gel permeation chromatography of the copolymers showed that the number-average molecular weights are consistently greater than the calculated values, and the dispersities are generally greater than 1.4, demonstrating limited control by the catalysts. Despite this restricted control, these catalysts were able to convert appreciable amounts of monomers into polymers either individually or within a copolymerisation. © 2022 The Authors. Polymer International published by John Wiley & Sons Ltd on behalf of Society of Industrial Chemistry.

更新日期：2022-05-24

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