Aggregation of nitrile-butadiene copolymers in solutionsстатья
Информация о цитировании статьи получена из
Web of Science ,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Авторы:
Litmanovich E.A.a ,
Prudskova T.N.b ,
Emel’Yanov S.V.c ,
Kudryavtsev Ya V.c. ,
Litmanovich A.D.c
Журнал:
Polymer Science, Series A
Том:
51
Номер:
11-12
Год издания:
2009
Издательство:
Pleiades Publishing, Ltd
Местоположение издательства:
Road Town, United Kingdom
Первая страница:
1277
Последняя страница:
1281
DOI:
10.1134/S0965545X09110121
Аннотация:
The nonuniformity of nitrile-butadiene rubber solutions in toluene and chloroform has been studied. Dynamic-light-scattering measurements show that these solutions contain two kinds of scattering particles: small particles 10-16 nm in radius corresponding to the macromolecular coil and large particles 400-500 nm in radius corresponding to aggregates. The aggregates are stable in solutions for at least several days. Such stability may be interpreted in terms of topological factors supposing that the aggregates are formed via noncovalent interactions of tens of thousands of highly branched entangled chains. The chains become disentangled even during slight shear. Thus, the solution of nitrile-butadiene rubber subjected to soft rolling mostly contains small particles. However, in the absence of external fields, such a structure is very stable in solution and even more so in the rubber block. During storage of nitrile-butadiene rubber, formation of a relatively small quantity of covalent crosslinks suffices for fixing the structure of aggregates and prevents the disentanglement of chains. Thus, the crosslinking of the aggregates may be primarily responsible for the natural aging of nitrile-butadiene rubber during storage. © 2009 Pleiades Publishing, Ltd.
Добавил в систему:
Литманович Екатерина Аркадьевна