000			01873nam a2200277Ia 4500
003			MX-MdCICY
005			20250625140610.0
040			_cCICY
090			_aB-9332
245	1	0	_aKinetics of poly(propylene fumarate)synthesis by step polymerization of diethyl fumarate and propylene glycol using zinc chloride as a catalyst
490	0		_vJ. Biomater. Sci. Polymer Ed., 13(1), p.95-108, 2002
520	3		_aDiethyl fumarate and propylene glycol were reacted in the presence of a zinc chloride catalyst to synthesize poly(propylene fumarate)(PPF)over a period of 12 hours. The kinetics of the transesteri. cation polymerization at 130±C, 150±C, and 200 ±C were determined by gel permeation chromatography (GPC)analysis. The initial rate of polymerization at each temperature was quanti. ed by calculating the rate of change of the number average molecular weight (Mn). At 200 ±C, gelation of the PPF occurred after 4 h. GPC analysis of the reaction showed that PPF synthesized at 150±C had a higher . nalMn of 4600 (§190)and a higher weight average molecular weight of 10 500 (§760)than at 130 ±C (n D 3). The chemical structure of the PPF was veri. ed by NMR and FT-IR analysis. This study demonstrated that the maximum Mn of PPF by a transesteri. cation reaction is limited due to gelation of PPF at high temperature.
650	1	4	_aPOLY(PROPYLENE FUMARATE)
650	1	4	_aSTEP POLYMERIZATION
650	1	4	_aKINETICS
650	1	4	_aTRANSESTERICATION
650	1	4	_aUNSATURATED POLYESTERS
700	1	2	_aShung, A.K.
700	1	2	_aTimmer, M.D.
700	1	2	_aJo, S.
700	1	2	_aEngel, P.S.
700	1	2	_aMikos, A.G.
856	4	0	_uhttps://drive.google.com/file/d/13qN9F_zon5MHfptLjAHBXJK2-kIuA41L/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
942			_2Loc _cREF1
008			250602s9999 xx |||||s2 |||| ||und|d
999			_c43582 _d43582