title: [Study on quantitative analysis of cross linked copolymer by IR].
abstract: Cross linked copolymer silicon oil-Co-lactide (Si-co-LA) was analyzed quantitatively by IR. Potassium sulfocyanate (KSCN) was chosen as an inside mark material, because it has only one strong absorption peak at 2 100 cm(-1) and the peak was chosen as its quantitative peak. The peak at 1750 cm(-1) is the characteristic absorption of carbonyl and was chosen as thequantitative peak of lactide (LA). The ratio of the two absorbencies is I, and I=ALA/AKSCN. KSCN and LA were mixed according to a certain mass ratio C=MLA/MKSCN to prepare standard samples. The curve of C versus I is the quantitative work curve. The result of the experiment indicates that the work curve has good linearity in the range of 2/5<MLA/MKSCN<8/5. The formulas calculating the proportion of every component in the cross linked copolymer were established: MKSC/MP=B, MLA/MKSCN=C, and (MLA/MP) x 100%=BC x 100%. Cross Linked Copolymer is hard to be analyzed quantitatively, because of its no dissolving and no melting. A convenient method of determining the component of the cross linked copolymer or other copolymer has been provided.
authors.affiliation: Department of Chemical Engineering, Ningbo University of Technology, Ningbo 315016, China. shaoqf85@163.com
authors.forename: Qiong-fang
authors.initials: QF
authors.lastname: Shao
authors.forename: Ming
authors.initials: M
authors.lastname: Dong
authors.forename: Shuai-hua
authors.initials: SH
authors.lastname: Chen
authors.forename: Chao
authors.initials: C
authors.lastname: Wei
authors.forename: Xiao-hong
authors.initials: XH
authors.lastname: Xie