Study on radiation grafting of N-vinylpyrrolidone onto poly (L-lactic acid)

PENG Chaorong; WANG Jingxia; CHEN Zhuping; WANG Xiuying; HUANG Cheng; CHEN Hao

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Study on radiation grafting of N-vinylpyrrolidone onto poly (L-lactic acid)

更新时间：2023-03-30

- Study on radiation grafting of N-vinylpyrrolidone onto poly (L-lactic acid)
- Journal of Radiation Research and Radiation Processing Vol. 27, Issue 2, Pages: 75-78(2009)
- 作者机构：
  
  1.四川省原子能研究院　成都　610066
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PENG Chaorong, WANG Jingxia, CHEN Zhuping, et al. Study on radiation grafting of N-vinylpyrrolidone onto poly (L-lactic acid). [J]. Journal of Radiation Research and Radiation Processing 27(2):75-78(2009)
DOI：

PENG Chaorong, WANG Jingxia, CHEN Zhuping, et al. Study on radiation grafting of N-vinylpyrrolidone onto poly (L-lactic acid). [J]. Journal of Radiation Research and Radiation Processing 27(2):75-78(2009) DOI：

摘要

以甲醇为溶剂，采用辐射接枝法制备了聚-L-乳酸（Poly-L-lactic acid，PLLA）/ N-乙烯基吡咯烷酮（N-vinyl pyrrolidone，NVP）接枝共聚物（Poly (L-lactide)-g-poly (N-vinyl pyrrolidone)，PLLA-g-PVP）。研究了不同吸收剂量对接枝率的影响，并用傅立叶变换红外光谱（Fourier transform infrared spectrometer，FT-IR）、核磁共振氢谱（Nuclear magnetic resonance,1,HNMR）、差示扫描量热法（Differential scanning calorimeter，DSC）对接枝共聚物进行了表征。结果表明，共聚物接枝率随吸收剂量的增加而增加，吸收剂量为5 kGy时，接枝率可达14.9 %；NVP链段C=O吸收峰出现在1660～1671 cm,-1,，随吸收剂量的增加移向高波数；在,1,HNMR中PLLA链段甲基和次甲基峰面积比大于3∶1，说明接枝反应可能发生在PLLA次甲基碳上；PLLA的结晶焓随吸收剂量的增加而增加；接枝共聚物的结晶焓随吸收剂量的增加而降低。

Abstract

Poly (L-lactic acid) grafting with N-vinylpyrrolidone (PLLA-g-PVP) was prepared by radiation in the presence of methanol as a solvent. The effect of absorbed dose on grafting ratio was investigated and the structures of PLLA-g-PVP were characterized by ,1,H-NMR, FT-IR and DSC. It shows that grafting ratio increases with increment of absorbed dose and grafting ratio reach 14.9 % at the absorbed dose of 5 kGy. The peaks of C=O stretching in chain of NVP occur in 1660~1671 cm,-1, which shift to higher wave numbers increasing with absorbed dose. In ,1,H-NMR, the area ratio of methyl to methine is more than 3:1 which indicates the position of grafting reaction may locate in methine attaching to methyl of PLLA. Enthalpy of PLLA increases with increment of absorbed dose, and Enthalpy of PLLA-g-PVP decreases with increment of absorbed dose.

关键词

γ辐照聚-L-乳酸N-乙烯基吡咯烷酮接枝

Keywords

γ-irradiationPoly (L-lactic acid)N-vinylpyrrolidoneGrafting

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