聚-L-乳酸辐射接枝N-乙烯基吡咯烷酮的研究

以甲醇为溶剂，采用辐射接枝法制备了聚-L-乳酸（Poly-L—lacticacid，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，^1HNMR）、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—1671cm^-1，随吸收剂量的增加移向高波数；在^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。

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

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 1H-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 number...