By Edwin J. Vandenberg (Eds.)
content material: Polyethers / Charles C. rate --
Poly(propylene ether) polyols ready with a zinc hexacyanocobaltate complicated catalyst / R.A. Livigni, R.J. Herold, O.C. Elmer, and S.L. Aggarwal --
Propylene oxide polymers of various stereosequence distribution / S.L. Aggarwal and L.F. Marker --
Heterogeneous nucleation of isotactic poly(propylene oxide) crystallization / J.H. Cole and L.E. St-Pierre --
utilized crystallization kinetics. three, comparability of polyepichlorohydrins of other stereoregularity / P. Dreyfuss --
X-ray structural research of crystalline polymers / Richard J. Cella and Robert E. Hughes --
Coordination polymerization of trimethylene oxide / E.J. Vandenberg and A.E. Robinson --
Vulcanization and stabilization stories on propylene oxide rubber / C.R. Boss --
abnormal constructions in polyepichlorohydrin / K.E. Steller --
Cationic polymerization of cyclic ethers initiated via superacid esters / Takeo Saegusa and Shiro Kobayashi --
Brominated poly(phenylene oxide)s. 1, Polymerization of mono-, di- and tribromo-2,6-dimethylphenol / Dwain M. White and Howard J. Klopfer --
Brominated poly(phenylene oxide)s. 2, Bromination of poly(2,6-dimethyl-1,4-phenylene oxide) / Dwain M. White and Charles M. Orlando --
Polyperfluoroalkylene ethers as high-temperature sealants / R.W. Rosser, J.A. Parker, R.J. Depasquale, and E.C. Stump, Jr.
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M e c h a n i s m . The f o l l o w i n g scheme i s o f f e r e d t o a c c o u n t f o r t h e d a t a p r e s e n t e d above. P o l y m e r i z a t i o n p r o b a b l y o c c u r s w i t h t h e g r o w i n g c h a i n c o o r d i n a t e d t o a z i n c atom. The c o o r d i n a t i o n s i t e s a r e i n i t i a l l y made a v a i l a b l e b y d i s p l a c e m e n t o f t h e 1,2dimethoxyethane from the c a t a l y s t , e i t h e r b y propylene o x i d e o r the i n i t i a t o r , 1,5-pentanediol.
The 1 , 5 - p e n t a n e d i o l d i s a p p e a r s e a r l y i n t h e r e a c t i o n b e c a u s e o f i t s more a c i d i c n a t u r e a n d g r e a t e r ease o f c o o r d i n a t i o n t h a n t h e secondary h y d r o x y l o f t h e poly(propylene ether). C o o r d i n a t i o n o f a growing c h a i n would decrease t h e f r e e - i o n character o f t h epropagating center, compared t o c a t a l y s i s w i t h a l k a l i m e t a l h y d r o x i d e s . ; ACS Symposium Series; American Chemical Society: Washington, DC, 1975.
Chem. Soc. (1961) 4298. 7. S n y d e r , W. , Taylor, K. , Chu, Ν. S. a n d Price, C. , T r a n s . Ν. Y. Acad. of Science Ser. II (1962) 24, (#4) 341. 8. S i m o n s , D. , Verbanc, J. , J. P o l y m . Sci. (1960) 44, 303. 9. , Hanna, J. , A n a l y . Chem. 10. 11. , S p e c t r o c h i m Acta (1961) 3 3 , 896. (1971) 27A, 2385. "1973 A n n u a l Book of ASTM S t a n d a r d s " , P a r t 26, p . 888, American Society for Testing and Materials, Philadelphia, Pennsylvania 19103. 12. , "Quantitative Organic G r o u p s " , 3rd Edition, 73-75, J o h n 13.