ICCAS OpenIR
Stereoselective polymerization of rac-lactide using a monoethylaluminum Schiff base complex
Tang, ZH; Chen, XS; Pang, X; Yang, YK; Zhang, XF; Jing, XB
2004-05-01
Source PublicationBIOMACROMOLECULES
ISSN1525-7797
Volume5Issue:3Pages:965-970
AbstractA monoethylaluminum Schiff base complex (2) with formula LA1Et (L = N,N'-(2,2-dimethylpropylene)bis(3,5-di-tei-t-butylsalicylideneimine) was synthesized and employed for the stercoselective ring-opening polymerization of rac-lactide (rac-LA). The complex 2 was characterized by nuclear magnetic resonance, crystal structure, and elemental analysis. It contains a five-coordinate aluminum atom with distorted trigonal bipyramidal geornetry in the solid state. In the presence of 2-propanol, 2 showed high stereoselectivity for the polymerization of rac-LA. The polymerization yielded crystalline poly(rac-LA) with a high melting temperature (193-201 degreesC). NMR, differential scanning calorimetry, and wide-angle X-ray diffraction indicated that the poly(rac-LA) was highly isotactic, and a stereocomplex was formed between poly-L- and poly-D-lactide block sequences. By the analysis of electrospray-ionization mass spectrometry and H-1 NMR, the polymer was demonstrated to be endcapped in both terminals with an isopropyl ester and a hydroxy group, respectively. The polymerization was of first order in rac-LA concentration. The relationship between the rac-LA conversion and molecular weights of the polymer was linear so that the polymerization could be well controlled.
DOI10.1021/bm034467o
Indexed BySCI ; IC ; CCR
Language英语
WOS IDWOS:000221315200046
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:170[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/82034
Collection中国科学院化学研究所
Corresponding AuthorChen, XS
AffiliationChinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Tang, ZH,Chen, XS,Pang, X,et al. Stereoselective polymerization of rac-lactide using a monoethylaluminum Schiff base complex[J]. BIOMACROMOLECULES,2004,5(3):965-970.
APA Tang, ZH,Chen, XS,Pang, X,Yang, YK,Zhang, XF,&Jing, XB.(2004).Stereoselective polymerization of rac-lactide using a monoethylaluminum Schiff base complex.BIOMACROMOLECULES,5(3),965-970.
MLA Tang, ZH,et al."Stereoselective polymerization of rac-lactide using a monoethylaluminum Schiff base complex".BIOMACROMOLECULES 5.3(2004):965-970.
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