![]()
AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
|
|||||||
The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary The summary of the selected article appears at the bottom of the page. In order to get back to the contents of the issue this article belongs to you have to access the link from the title. In order to see all the articles of the archive which have as author/co-author one of the authors mentioned below, you have to access the link from the author's name. |
|||||||
STUDIA CHEMIA - Issue no. 2 / 2011 | |||||||
Article: |
SYNTHESIS OF POLY(L-LACTIC ACID) BY DIRECT POLYCONDENSATION. Authors: OANA CADAR, SERGIU CADAR, MARIN ŞENILĂ, CORNELIA MAJDIK, CECILIA ROMAN. |
||||||
Abstract: Poy (lactic acid), a biodegradable polymer, has been extensively studied during last 15 years due to its wide range of applications. In this study, the synthesis of the poly (L-lactic) acid) with appropriate molecular weight for medical applications was investigated. Stanous(II) chloride was used as catalyst in a quantity of 0.25 wt% calculated on the monomer. Polycondensation was carried out over a period of 72 h, using xylene as solvent. The identification and purity of the obtained polymer was assessed by NMR spectroscopy. The molecular weight of PLA was measured by the intrinsic viscosity method. Keywords: lactic acid, catalysis, direct polycondensation. |
|||||||
![]() |
|||||||