Ring-opening Copolymerization of L-Lactide and <italic style="font-style: italic">δ</italic>-Valerolactone Catalyzed by Benzoxazolyl Urea Catalyst/MTBD

Chen-lin Ji; Su-yun Jie; Bo-geng Li

doi:10.11777/j.issn1000-3304.2021.21400

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Ring-opening Copolymerization of L-Lactide and δ-Valerolactone Catalyzed by Benzoxazolyl Urea Catalyst/MTBD

Research Article | 更新时间：2024-10-08

- Ring-opening Copolymerization of L-Lactide and δ-Valerolactone Catalyzed by Benzoxazolyl Urea Catalyst/MTBD
- ACTA POLYMERICA SINICA Vol. 53, Issue 5, Pages: 488-496(2022)
- 作者机构：
  
  化学工程联合国家重点实验室浙江大学化学工程与生物工程学院杭州 310027
- 作者简介：
  
  Su-yun Jie, E-mail: jiesy@zju.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2021.21400
  CLC：
- Published：20 May 2022，
  
  Published Online：01 March 2022，
  
  Received：28 December 2021，
  
  Accepted：24 January 2022
- 稿件说明：
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季晨霖,介素云,李伯耿.苯并噁唑脲/MTBD催化L-丙交酯和δ-戊内酯开环共聚合[J].高分子学报,2022,53(05):488-496.

Ji Chen-lin,Jie Su-yun,Li Bo-geng.Ring-opening Copolymerization of L-Lactide and δ-Valerolactone Catalyzed by Benzoxazolyl Urea Catalyst/MTBD[J].ACTA POLYMERICA SINICA,2022,53(05):488-496.
季晨霖,介素云,李伯耿.苯并噁唑脲/MTBD催化L-丙交酯和δ-戊内酯开环共聚合[J].高分子学报,2022,53(05):488-496. DOI： 10.11777/j.issn1000-3304.2021.21400.

Ji Chen-lin,Jie Su-yun,Li Bo-geng.Ring-opening Copolymerization of L-Lactide and δ-Valerolactone Catalyzed by Benzoxazolyl Urea Catalyst/MTBD[J].ACTA POLYMERICA SINICA,2022,53(05):488-496. DOI： 10.11777/j.issn1000-3304.2021.21400.

摘要

以苯并噁唑脲(

)为催化剂，与杂二环[4.4.0

]

癸-5-烯(MTBD)协同，进行了L-丙交酯的开环聚合以及

-戊内酯与L-丙交酯的开环共聚合，采用核磁共振波谱(

NMR)分析了共聚物的序列结构，原料预混合下所得共聚物的随机度(

)为0.5左右，介于完全无规共聚物和嵌段共聚物之间. 采用示差扫描量热分析(DSC)测试了均聚物和共聚物的热性能，共聚物中两单体含量接近时，没有观察到熔融峰的出现，且样品在常温下呈橡胶态，为无定形聚合物；随着戊内酯(VL)链段的减少，共聚物的玻璃化转变温度升高. 嵌段共聚物的分子序列可控，随机度趋近于0.

Abstract

In combination with 7-methyl-1

‍5

‍7-triazabicyclo[4.4.0

]

dec-5-ene (MTBD)

the benzoxazolyl urea (

) catalyst was very efficient for the solution ring-opening polymerization of L-lactide (L-LA) in the presence of benzyl alcohol. On the basis of homopolymerization

the solution ring-opening copolymerization of L-LA and

δ‍

-valerolactone (

δ‍

-‍VL) was investigated and the PLLA-

-PVL random and PLLA-

-PVL block copolymers were prepared

via

varying the feeding strategy (premixing or sequential feeding) and the feeding ratio of two monomers. The sequence structure of copolymers was analyzed by

H- and

C-NMR spectra and the copolymer compositions in the copolymers were in consistence with the feeding ratio of two monomers. The randomness

of the random copolymers prepared

via

premixing two monomers was abo

ut 0.5

which was between completely random and block copolymers. The thermal properties were tested by the differential calorimetry scanning (DSC). When the contents of two monomers in the copolymers were relatively close

no melting peak could be observed in the DSC curves and the samples was rubbery at room temperature as an amorphous polymer. As the content of VL segments decreased

the glass transition temperature of random copolymers increased. In addition

the block copolymers (PLLA-

-PVL) were synthesized through the "one-pot method" and "chain extension method". The sequence of segments was controllable and the randomness

approached zero.

关键词

苯并噁唑脲L-丙交酯δ-戊内酯共聚

Keywords

Benzoxazolyl ureaL-lactideδ-valerolactoneCopolymerization

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⁰

Ring-opening Copolymerization of L-Lactide and δ-Valerolactone Catalyzed by Benzoxazolyl Urea Catalyst/MTBD

DOI：10.11777/j.issn1000-3304.2021.21400

摘要

Abstract

关键词

Keywords

references