二醋酸纤维素与聚乙二醇单甲醚接枝物的表征

The Characterization of the Graft Copolymer of CDA with MPEG

对二醋酸纤维素 (CDA)与聚乙二醇单甲醚 (MPEG)接枝共聚物进行了FTIR ,DSC ,1HNMR和13 CNMR的表征分析 .结果表明 :在 15 38cm- 1出现酰胺II带氨基甲酸酯的吸收峰 ,在 16 0 4cm- 1出现芳香环的吸收峰 ;从DSC分析可知 ,由于MPEG被固定后 ,链段运动自由度受到限制 ,使得MPEG的实际的相变焓比理论相变焓小 ;用1HNMR和13 CNMR核磁共振技术研究了这种CDA和MPEG的接枝共聚物 ,并确定了1HNMR和13 CNMR谱中各谱峰的归属 ,证明了MPEG是通过化学键连接到CDA上 .

FTIR, DSC, 1HNMR, 13 CNMR of graft copolymers of cellulose diacetate with monomethoxyl polyethylene glycol (CDA_g_MPEG) were investigated.It was illustrated in FTIR spectra that CDA_g_MPEG had amide II band of carbamate (-NHCOO-) in 1538 cm -1 and conjugate vibration band of aromatic ring in 1604 cm -1 . It was also illustrated in DSC that the realistic phase change enthalpy of MPEG in CDA_g_MPEG was smaller than the theoretic phase change enthalpy because freedom of segment was limited after the MPEG segments were fixed to the CDA. 1HNMR and 13 CNMR studied the graft structure in CDA_g_MPEG. 1HNMR and 13 CNMR spectra of CDA_g_MPEG were assigned completely.The findings provide a basis for studying of grafting reaction between CDA and PEG.