Read e-book online Allgemeine und Anorganische Chemie. Ein Lehrbuch fur PDF

By Riedel, E.

ISBN-10: 3110089076

ISBN-13: 9783110089073

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Extra info for Allgemeine und Anorganische Chemie. Ein Lehrbuch fur Studenten mit Nebenfach Chemie 2. Auflage

Example text

Chain lengths o f remaining chains remain unchanged. Counter, i f end-group depolymerization i s followed by incomplete unzipping, C, average chain length w i l l decrease slowly, the change i n average chain l e n g t h r e l a t e d t o the s i z e of segment removed, i n c l u d i n g l o o p s . A curve such as Β r e s u l t s where random s i s s i o n i s followed by complete unzipping s i n c e there i s a r e l a t i v e l y slow decrease i n molecular weight with conversion. Random depolymerization followed by incomplete unzipping r e s u l t s i n a r a p i d decrease i n molecular weight with conversion and i s p i c t o r i a l i z e d as D.

CH. I 3 ι 3 - f S i — C - B H, C - S i - 0 - 4 I 10 10 J Λn CH CH CH. CH CH. CHL ι 3 ι 3 | 3 t 3 | 3 -{O-Si-0-Si-C-B H, - C - S i — 0 — S i — 0 — S i - 4 1 I 10 10 ι j j 0 n 3 C H 0 Λn ^ CH 3 CH n CH 3 CH 3 J5 CH 3 16 CH. I 3 -fÇi—0-4 CH 3 Jl Another u t i l i z e d approach f o r preventing r e v e r s i o n i n v o l v e s c r o s s l i n k i n g o f the s i l o x a n e s . For i n s t a n c e , a number o f methyl s i l i c o n e rubbers were c r o s s l i n k e d , (about 1 c r o s s l i n k per 3,000 to 20,000 u n i t s (10-21) f o r c r o s s l i n k e d products mainly composed of dimethylsiloxane; R e f s .

C. Carraher, J. Macromol. -Chemistry, A17(8), 1293 (1982). 2. E. Horowitz, M. Tryon, R. P. Perros, J. Appl. Polym. , 9, 2321 (1915). 3. G. Gee, Chem. Soc. (London) Spec. Publ. No. 15, 65 (1961). 4. S. M. Martin, J. Amer. ,619 (1958). 5. C. Carraher and J. ,19(2),619 (1978). 6. C. Carraher, V. Foster, H. Molloy, M. Taylor, T, Tiernan and J. Schroeder, J. Macromol. , A16(1), 231 (1981). 7. R. Brotherton, Conference on High Temperature Polymer & Fluid Research, A50-TDR-62-372 (August 1962), p. 389.

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Allgemeine und Anorganische Chemie. Ein Lehrbuch fur Studenten mit Nebenfach Chemie 2. Auflage by Riedel, E.


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