SciELO - Scientific Electronic Library Online

vol.18 suppl.2Fique Fiber Tensile Elastic Modulus Dependence with Diameter Using the Weibull Statistical AnalysisPhysicochemical, Mechanical and Morphologic Characterization of Purple Banana Fibers author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Materials Research

Print version ISSN 1516-1439On-line version ISSN 1980-5373


MIRANDA, Katiusca Wessler et al. Biodegradable Copolymers Obtained by Solution Polymerization. Mat. Res. [online]. 2015, vol.18, suppl.2, pp.200-204.  Epub Oct 23, 2015. ISSN 1516-1439.

This study aims the synthesis of copolymers of poly (l-lactic acid) and polycaprolactone by ring opening polymerization. The reactions between l-lactide (LLA) and ε-caprolactone (CL) monomers, in 100/0, 95/5, 90/10 and 80/20 LLA/CL mass ratios, were conducted in refluxing toluene, using Stannous octoate as iniciator, methanol as co-iniciator and inert atmosphere (N2). The reaction medium was maintained under stirring at 120 °C for 24 hours. The samples were characterized by carbon-13 and proton nuclear magnetic resonance (C13-NMR and H1-NMR), and gel permeation chromatography (GPC). Monomers were characterized by thermogravimetry (TG). Copolymers were formed only in samples containing 20 wt% ε-caprolactone. NMR spectra of the other samples showed no evidence of CL units. This fact may be associated with the low-temperature volatilization of monomers. The GPC analysis showed that the increase of CL concentration decrease the molecular weight of copolymers.

Keywords : ring opening polymerization; copolymer; poly(l-lactide acid); polycaprolactone.

        · text in English     · English ( pdf )