Effect on molecular weight of poly (L-lactic acid) by irradiation graft with NVP

PENG Chaorong; WANG Jingxia; NI Maojun; LIU Siyang; CHEN Zhuping; ZHANG Jing; HUANG Ke

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Effect on molecular weight of poly (L-lactic acid) by irradiation graft with NVP

更新时间：2023-03-30

- Effect on molecular weight of poly (L-lactic acid) by irradiation graft with NVP
- Journal of Radiation Research and Radiation Processing Vol. 28, Issue 6, Pages: 325-328(2010)
- 作者机构：
  
  1.四川省原子能研究院　成都　610101
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PENG Chaorong, WANG Jingxia, NI Maojun, et al. Effect on molecular weight of poly (L-lactic acid) by irradiation graft with NVP. [J]. Journal of Radiation Research and Radiation Processing 28(6):325-328(2010)
DOI：

PENG Chaorong, WANG Jingxia, NI Maojun, et al. Effect on molecular weight of poly (L-lactic acid) by irradiation graft with NVP. [J]. Journal of Radiation Research and Radiation Processing 28(6):325-328(2010) 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。研究了醋酸（Acetic acid，HAc）浓度、单体浓度和剂量率对接枝共聚物分子量的影响，并采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,H-NMR）、热重分析法（Thermogravimetry analysis，TGA）对接枝共聚物进行了表征。结果表明，在相同吸收剂量下，接枝共聚物的分子量与反应介质中HAc浓度、单体浓度以及剂量率相关。当HAc浓度为0.05 mol/L，单体浓度为30%，剂量率为500 Gy/h时，接枝共聚物的分子量分别出现极大值。随着接枝率的增大，接枝共聚物的两个热失重阶段变得更为明显。

Abstract

Copolymer of poly (L-lactic acid) (PLLA) grafted with N-vinylpyrrolidone (PLLA-g-PVP) was prepared by γ-irradiation in the presence of methanol as a solvent. The effects of acetic acid (HAc) concentration, monomer concentration and dose rate on molecular weight of PLLA-g-PVP were investigated and the structure of PLLA-g-PVP was characterized by ,1,H-NMR, FT-IR and TGA, respectively. It shows that, the HAc concentration, monomer concentration and dose rate have an effect on the molecular weight of PLLA-g-PVP at the same absorbed dose. The maximum molecular weight of the copolymers can be obtained in optimum condition of HAc concentration 0.05mol/L, monomer concentration 30% and dose rate 500 Gy/h, respectively. The two weight loss stages of graft copolymers have been observed more distinctly with the increment of graft ratio.

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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