Physical aging behavior of a series of biodegradable polymers as a function of the pendent-chain length

Author

Bron, Samuel ; Fiordeliso, James ; Kohn, Joachim

Author_Institution

Dept. of Chem., Rutgers Univ., Piscataway, NJ, USA

fYear

1993

fDate

18-19 Mar 1993

Firstpage

145

Lastpage

147

Abstract

The physical aging behavior of a series of tyrosine-containing polyarylates was investigated as a function of the length of the alkyl pendent chain. The experiments were performed in a differential scanning calorimeter (DSC) at corresponding aging temperatures. It was found that the physical aging efficiency was strongly affected by small changes in the length of the pendent chain (2, 6, or 8 methylene units). For similar cooling rates from above T_g to below T_g and identical aging times, the enthalpy relaxation decreased with the length of the pendent chain. A free volume based explanation is suggested

Keywords

ageing; enthalpy; environmental degradation; glass transition; polymer structure; polymers; prosthetics; thermal analysis; 40 to 80 C; DSC; biodegradable polymers; enthalpy relaxation; free volume; glass transition; medical applications; pendent-chain length; physical aging behavior; tissue compatibility; tyrosine-containing polyarylates; Aging; Amino acids; Biodegradable materials; Biomedical equipment; Chemical elements; Cooling; Medical services; Polymers; Spine; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Bioengineering Conference, 1993., Proceedings of the 1993 IEEE Nineteenth Annual Northeast

Conference_Location

Newark, NJ

Print_ISBN

0-7803-0925-1

Type

conf

DOI

10.1109/NEBC.1993.404381

Filename

404381