SYNTHESIS AND CHARACTERIZATION OF BIODEGRADABLEPOLY(5HYDROXYLEVULINIC ACID-co-L-LACTIC ACID)

ZHANG Yan; GUO Zhenghong; CHENG Jie; FANG Zhengping

doi:10.3724/SP.J.1105.2009.00180

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SYNTHESIS AND CHARACTERIZATION OF BIODEGRADABLEPOLY(5HYDROXYLEVULINIC ACID-co-L-LACTIC ACID)

Research Article | 更新时间：2021-03-19

- SYNTHESIS AND CHARACTERIZATION OF BIODEGRADABLEPOLY(5HYDROXYLEVULINIC ACID-co-L-LACTIC ACID)
- Acta Polymerica Sinica Issue 2, Pages: 180-186(2009)
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- DOI：10.3724/SP.J.1105.2009.00180
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- Published：20 February 2009，
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ZHANG Yan, GUO Zhenghong, CHENG Jie, FANG Zhengping. SYNTHESIS AND CHARACTERIZATION OF BIODEGRADABLEPOLY(5HYDROXYLEVULINIC ACID-co-L-LACTIC ACID). [J]. Acta Polymerica Sinica (2):180-186(2009)
DOI：

ZHANG Yan, GUO Zhenghong, CHENG Jie, FANG Zhengping. SYNTHESIS AND CHARACTERIZATION OF BIODEGRADABLEPOLY(5HYDROXYLEVULINIC ACID-co-L-LACTIC ACID). [J]. Acta Polymerica Sinica (2):180-186(2009) DOI： 10.3724/SP.J.1105.2009.00180.

摘要

通过5-羟基乙酰丙酸(5-HLA)与L-乳酸(LLA)的熔融缩聚合成了聚(5-羟基乙酰丙酸-co-L乳酸)(PHLL)，并用凝胶渗透色谱法、X射线衍射法、核磁共振、红外光谱和差示量热扫描法对其进行表征.结果表明，由于5-HLA的羰基与LLA的羟基发生醚化反应，使得共聚产物中存在烯醚键支化结构.在较宽的共聚组成范围内共聚物呈无定形态.同时由于共聚物中5-HLA链节中的氢键作用，使得5-HLA含量的增加可将PHLL的玻璃化温度由54.6℃提高到91.4℃.PHLL在去离子水中的降解行为表明，PHLL在水性溶液中容易发生降解，其降解速度与微观结构有关；无定形的LLA链节比5-HLA链节降解速度快.

Abstract

Synthesis of biobased and biodegradable polymers from renewable biomass has attracted much attention in recent years.Levulinic acid has been deemed as a platform chemical from non-food stuff biomass

and some of its derivatives are starting materials for new polymers.In this paper

poly(5-hydroxylevulinic acid-co-L-lactic acid) (PHLL) was synthesized via melt copolycondensation of 5-hydroxylevulinic acid (5-HLA) and L-lactic acid (LLA) and characterized with GPC

X-ray

1H-NMR

FTIR and DSC.The results showed that the copolymers had interesting olefinic ether branch structures formed via etherification between carbonyl of 5-HLA and hydroxyl in LLA.The copolymer was amorphous in a broad composition range and had high glass transition temperature (Tg) ranging from 54.6℃ to 91.4℃

which increased with the increase of 5-HLA content due to the existence of hydrogen bonds in the 5-HLA moiety of the copolymer.The hydrolytic degradation behavior in deionized water showed that PHLL readily degraded hydrolytically in aqueous medium

and the degradation rate depended on its microstructure.The amorphous LLA moiety degraded faster than the 5HLA counterpart.

关键词

可降解可再生资源乙酰丙酸缩聚生物质

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