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By S. S. Labana

content material: Formation and homes of polymer networks : experimental and theoretical experiences / J.L. Stanford, R.F.T. Stepto, and R.H. nonetheless --
laptop simulation of end-linked elastomers : sol-gel distributions at excessive extents of response / Yu-Kwan Leung and B.E. Eichinger --
Rheological alterations in the course of the copolymerization of vinyl and divinyl monomers / D.T. Landin and C.W. Macosko --
Elastomeric poly(dimethylsiloxane) networks with quite a few short-chain segments / J.E. Mark and J.G. Curro --
gentle scattering of randomly cross-linked polystyrene / Kanji Kajiwara and Walther Burchard --
Correlation networks in polymeric fabrics made up our minds by means of small-angle neutron scattering / L.H. Sperling, A.M. Fernandez, and G.D. Wignall --
Carboxyl-terminated butadiene-acrylonitrile-modified epoxy resin and its graphite fiber-reinforced composite : morphology and dynamic mechanical homes / Su-Don Hong, Shirley Y. Chung, George Neilson, and Robert F. Fedors --
Mechanical habit of a few epoxies with epoxidized average oils as reactive diluents / Shahid Qureshi, J.A. Manson, J.C. Michel, R.W. Hertzberg, and L.H. Sperling --
quantity restoration in aerospace epoxy resins : results on time-dependent houses of carbon fiber-reinforced epoxy composites / Eric S.W. Kong --
constitution and fracture of hugely cross-linked networks / J.D. Lemay, B.J. Swetlin, and F.N. Kelley --
Fractographic impact of glassy natural networks / D.T. Turner --
Peroxide cross-linked common rubber and cis-polybutadiene : characterization by way of high-resolution solid-state carbon-13 NMR / Dwight J. Patterson and Jack L. Koenig --
Carbon-13 magic perspective NMR spectroscopic stories of an epoxy resin community / A. Cholli, W.M. Ritchey, and Jack L. Koenig --
NMR kinetic research of polyethylene-peroxide cross-linking reactions / V.D. McGinniss and J.R. Nixon --
Degradation chemistry of fundamental cross-links in high-solids the teeth finishes : solar-assisted hydrolysis / Alan D. English and Harry J. Spinelli --
IR spectroscopic stories of decay in cross-linked networks : photoenhanced hydrolysis of acrylic-melamine coatings / D.R. Bauer and L.M. Briggs --
Electron spin resonance (ESR) of photodegradation in polymer networks : photoinitiation expense size by means of nitroxide termination / John L. Gerlock, David R. Bauer, and L.M. Briggs --
hugely cross-linked CR-39 polycarbonate and its degradation by means of high-energy radiation / J.L. Cercena, J. Groeger, A.A. Mehta, R. Prottas, J.F. Johnson, and S.J. Huang.

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Mark, J. Chem. , 72, 2282 (1980). A. L. Andrady, M. A. Llorente, and J. E. Mark, J. Chem. , 73, 1439 (1980). J. E. Mark and A. L. Andrady, Rubber Chem. , 54, 366 (1981). M. A. Llorente, A. L. Andrady, and J. E. Mark, J. Polym. , Polym. Phys. , 19, 621 (1981). M. A. Llorente, A. L. Andrady, and J. E. Mark, Colloid and Polym. , 259, 1056 (1981). J. E. Mark, Adv. Polym. , 44, 1 (1982). J. E. Mark, in "Elastomers and Rubber Elasticity", ed. by J. E. Mark and J. , 1982. -M. Zhang and J. E. Mark, J. Polym.

ACS Symposium Series; American Chemical Society: Washington, DC, 1984. 50 for the perfect network. Table I I I . 410 1/2 Theoretica DEPEDEBCE OP LOOP PROBABILITY OH CHAIN LEWGTH The weight fraction T) of one-chain loops i n the polymerization system i s defined as the percentage of primary molecules whose ends are connected d i r e c t l y to each ^ y The log-log plots of T) vs. rms end-to-end distance of the primary chain at different functionalities and conversions yield pare1lei straight lines.

These s t u d i e s were motivated i n part by the grow­ i n g use of r e a c t i v e polymer processing and more s p e c i f i c a l l y by the development of r e a c t i o n i n j e c t i o n molding (RIM). Such studies provide the fundamental knowledge necessary to understand network formation and p r o p e r t i e s on the molecular l e v e l which i n turn a s s i s t i n the s e l e c t i o n of optimum parameters f o r the processing operation. Much l e s s work has been done on r e l a t i n g r h e o l o g i c a l changes to s t r u c t u r a l changes during r a d i c a l chain growth p o l y m e r i z a t i o n .

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