In the presence of a small molecular protic initiator, immortal ring-opening polymerization (ROP) of lactide (LA) is a highly efficient strategy to synthesize polylactide in a controllable manner, while using polymeric alcohol as an initiator has been less investigated. A series of polymeric alcohols (PS–OH) composed of styrene and 4.3%–18% hydroxyl functional styrene (diethyl(hydroxy(4-vinylph...

PREFACE 3 Preface It is indeed a pleasure to present our report of research activities 2003-2004. We thank you for your interest and your support during the last two years. We hope that this information is of use to you and look forward to continuing what has become excellent cooperation. Non viral delivery of BMP-2 plasmids with a new copolymer protected gene vector (Coprog) incorporated in a ...

Abstract This work shows investigation of the transmission dynamics polymer samples made PLA plastic (polylactide) by fused deposition modelling for electron beam. Besides, results tests mechanical destruction (compression) with radiation exposure and without are shown. Article demonstrates that properties stable up to 1.5 kGy, proves suitability this material sample production intended depth d...

Stereoselective polymerization of racemic lactide (rac-LA) was examined using Al-achiral ligand complexes. By introduction of substituents in aromatic rings of Schiff base ligands, a higher selectivity was obtained without any chiral auxiliaries in the catalyst via a chain-end control mechanism. The T(m) values (T(m) 170-192 degrees C) were comparable to or higher than that of homochiral polyme...

In this study, Kraft softwood lignin was treated with acetic and propionic anhydride to produce esterified lignin. Reactions were performed at 85 ̊C. The product was characterized using IR, DSC and different parameters required to index the ease of processoperation. The chemically modified as well as esterified lignin was then blended with biorenewable polymer such as polylactide (PLA) and extru...

The number of known asymmetrically substituted hemilactides, important precursors for obtaining regular derivatives of polylactide polymers, is still limited and structural characterization of most of them is incomplete. In the title racemic 1,4-dioxane-2,5-dione derivative, C9H10O5, the hemilactide heterocycle exhibits a twist-boat conformation. The bulkier propynyloxymethyl group is in an axi...

A total of 11 patients (12 knees) with stable lesions of osteochondritis dissecans of the knee underwent arthroscopic fixation of the fragments using polylactide bioabsorbable pins. The site of the lesion was the medial femoral condyle in ten knees and the lateral femoral condyle in two. The mean age of the patients was 14.8 years (12 to 16). At a mean follow-up of 32.4 months (13 to 38 months)...

The results of experimental studies the fluorescence response polylactide foams saturated with rhodamine 6G and composites used for their preparation in region transition from spontaneous to stochastic laser generation are presented. A small increase threshold foamed compared expected one is interpreted as a result contribution waveguide mode propagation polymer matrix.. Keywords: foam, fluores...