fulltext.study @t Gmail

Liquid-crystalline aromatic–aliphatic copolyester bioresorbable polymers

Paper ID Volume ID Publish Year Pages File Format Full-Text
7722 562 2010 7 PDF Available
Title
Liquid-crystalline aromatic–aliphatic copolyester bioresorbable polymers
Abstract

The synthesis and characterisation of a series of liquid-crystalline aromatic–aliphatic copolyesters are presented. Differential scanning calorimetry showed these polymers have a glass transition temperature in the range 72 °C–116 °C. Polarised optical microscopy showed each polymer exhibits a nematic mesophase on heating to the molten state at temperatures below 165 °C. Melt processing is demonstrated by the production of injection moulded and compression moulded specimens with Young’s modulus of 5.7 ± 0.3 GPa and 2.3 ± 0.3 GPa, respectively. Wide-angle X-ray scattering data showed molecular orientation is responsible for the increase of mechanical properties along the injection direction. Degradation studies in the temperature range 37 °C–80 °C are presented for one polymer of this series and a kinetic constant of 0.002 days−1 is obtained at 37 °C assuming a first order reaction. The activation energy (83.4 kJ mol−1) is obtained following the Arrhenius analysis of degradation, showing degradation of this material is less temperature sensitive compared with other commercially available biodegradable polyesters. In vitro and in vivo biocompatibility data are presented and it is shown the unique combination of degradative, mechanical and biological properties of these polymers may represent in the future an alternative for medical device manufacturers.

Keywords
Liquid crystal; Polymerisation; Mechanical properties; Biodegradation; Biocompatibility
First Page Preview
Liquid-crystalline aromatic–aliphatic copolyester bioresorbable polymers
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 31, Issue 30, October 2010, Pages 7599–7605
Authors
, , , , , , , , , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us