von Burkersroda, Friederike and Gref, Ruxandra and Goepferich, Achim (1997) Erosion of biodegradable block copolymers made of poly(D,L-lactic acid) and poly(ethylene glycol). BIOMATERIALS, 18 (24). pp. 1599-1607. ISSN 0142-9612, 1878-5905
Full text not available from this repository.Abstract
Biodegradable block copolymers made of poly(ethylene glycol) monomethylether (Me.PEG) and poly(D,L-lactic acid) (PLA) were investigated for their erosion properties. Wide angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) investigations prior to erosion revealed that despite the low content of crystallizable Me.PEG of 10%, Me.PEG5-PLA45 is a partially crystalline polymer. The erosion of the polymer was investigated using cylindrical polymer matrix discs with a diameter of 8 mm and a height of 1.5 mm. WAXD and DSC spectra obtained from eroded polymer matrix discs suggest that both polymer blocks separate completely during erosion. The crystallinity of Me.PEG5-PLA45 was found to increase during erosion, which is probably due to the improved mobility of Me.PEG inside the polymer with a progressive degree of degradation. The erosion kinetics were found to be similar to that of PLA or poly(lactic-co-glycolic acid). During erosion the polymer matrix weight of dried samples remains constant for 11 weeks after which erosion sets in rapidly. From this observation one can conclude that the impact of the relatively small Me.PEG chains on Me.PEG5-PLA45 erosion is not pronounced. This is beneficial for all those applications that require the stability of the polymer matrix and in which the Me.PEG chain is intended to bring about other effects such as the modification of the surface properties of PLA polymers. (C) 1998 Elsevier Science Limited. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DEGRADATION; POLYLACTONES; MECHANISM; POLYMERS; LACTIDE; RELEASE; block copolymer; Me.PEG; PLA; Me.PEG-PLA; erosion |
| Subjects: | 600 Technology > 600 Technology (Applied sciences) 600 Technology > 615 Pharmacy |
| Divisions: | Chemistry and Pharmacy > Institute of Pharmacy > Pharmaceutical Technology (Prof. Göpferich) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 28 Mar 2023 05:30 |
| Last Modified: | 28 Mar 2023 05:30 |
| URI: | https://pred.uni-regensburg.de/id/eprint/50343 |
Actions (login required)
 |
View Item |
