Title :
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
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 Tg to below Tg 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;
Conference_Titel :
Bioengineering Conference, 1993., Proceedings of the 1993 IEEE Nineteenth Annual Northeast
Conference_Location :
Newark, NJ
Print_ISBN :
0-7803-0925-1
DOI :
10.1109/NEBC.1993.404381
