ISSN:
0887-624X
Schlagwort(e):
poly(phosphate ester)s
;
liquid crystalline polymer
;
smectic phase
;
thermal stability
;
biodegradation
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Poly(phosphate ester)s, PPE 1a-d, were synthesized from polycondensation of methyl phosphorodichloridate (MPDC) with various bisphenols such as 4,4′-biphenol 1a, 4,4′-dihydroxyphenylether 1b, bis(4-hydroxyphenyl)methane 1c, and 3,3′-dimethyl-4,4′-dihy-droxybiphenyl 1d. PPE 2a-d with hexamethylene spacers were also obtained from poly-condensation of MPDC with 4,4′-bis(6-hydroxyhexyloxy)biphenyl 2a, 4,4′-di(6-hydroxyhexyloxy)phenyl ether 2b, bis[4-(6-hydroxyhexyloxy)phenyl]methane 2c, and 3,3′-dimethyl 4,4′-di(6-hydroxyhexyloxy)biphenyl 2d. The degree of crystallinity of PPE 1a-1d without hexamethylene spacer was 3.3-17.6%, whereas PPE 2a and PPE 2b which exhibit mesomorphic behavior were 20.1 and 18.6%, respectively. PPE 2a and PPE 2b show the mesophase at 139.6-195.5°C and 42.4-66.3°C, respectively. PPE 2c and PPE 2d were obtained as rubbery. From pyrolysis of PPE in air the temperature corresponding to 5% weight loss was found to be 322-408°C and 284-291°C for PPE 1 and PPE 2, respectively. It was also found that PPE 2a was enzymatically degraded by phospholipase C. © 1994 John Wiley & Sons, Inc.
Zusätzliches Material:
7 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/pola.1994.080321114
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