By A J Domb; Joseph Kost; David M Wiseman
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The dried mother liquor is then placed in a two neck flask equipped with a distillation head and stopper. Benzyl bromide (100 grams) and pyridine (50 grams) are then added. The mixture is then distilled under reduced pressure at a rate of 60 drops per minute. 6 Kg of crude p-dioxanone is recovered. Two hundred grams of the crude reaction product is then placed in an Erlenmeyer flask alongwith 200 ml of ethyl acetate at room temperature. The stirred, clear,yellow solution is then cooled to -20°CAfter 10 minutes, stirring is stopped and 2 grams of pure p-dioxanone monomer crystal seeds are added.
Arthrowopf, 11, 194-198. Pihlajmaki. , Hirvensalo, E.. , Rokkanen, P. /. Bone andJoint Slug [BI-1. 74-B, 853-857. , Bendix. D.. h1uhling. J.. F. (199%) Poly(1-lactide): A long-term degradation study in-who. part 111: anal) tical characterization. Biomalmiul's, 14, 291-298. , Reuther, J . , Mullling, J. (1993b) Poly(L-lactide): A long-tern1 degradation study in-wino. part I: biological results, Biomatenah, 14, 671-677. ,Reuther, J.. and hIiche1, C . (1994) Poly(1-lactide): a long-term degradation stud) in-vivo.
The most commercially viable method relies upon melt polymerization. V. Catalyst, Initiator 110% Poly(p-dioxanone) homopolymer AoAc H3 0 Catalyst, Initiator 110% Lactide Figure 6 Poly(p-dioxanone-co-(L-)lactide) segmented copolymers. about 95% at reaction temperatures of 80-85'C, to about 75% at 110^C,to about 50% at 150CC,a convenient way to carry out copolymerization of PDO and other lactones is in a two step process. One first conducts a melt polymerization of p-dioxanone to produce a mixture of PDO h o m o p o l p e r and monomer (Figure 6).