Advances in Polymer Science 89 by Andreis Kulicke

By Andreis Kulicke

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The percent of crosslinking is calculated from the chlorine contents of the polymers using two different models: each Friedel-Crafts crosslinked aromatic ring is bound to only one methylene crosslink carbon (FC-1), and the average Friedel-Crafts crosslinked aromatic ring is bound to two methylene crosslink carbons (FC-2). From the comparison of the experimental aliphatic peak areas with peak areas calculated from models of crosslinking, one can determine which carbon atoms are not detected in the spectra of highly crosslinked polymers.

22) 106). 4. With increasing crosslink density in natural rubber the minimum in the temperature dependence of |a is shifted to higher temperatures and the line shapes of FID are changed from Gaussian to Lorentzian in the temperature region above the glass transition 107). 5)88> and iii) in uncrosslinked cw-polyisoprenes with Mn > 30000, when the presence of entanglements produces a transient network structure. Irradiation crosslinking of polyisoprenes having smaller Mn leads to a similar effect91).

Since the styrene is a poor solvent for polyester chains the copolymerization takes place at statistically placed radicals (R') 8 5 ) . The multicomponent FID observed in the amine-hardened diglycidyl ether of diphenylpropane is believed to be a consequence of nonuniformity in the kinetic behaviour of the various network fragments; in the case of three components, protons are ascribed to the following groups : "ends" (molecules attached with with one end to a nodal fragment), spacers (chains between crosslinks) and nodal fragments, respectively 104).

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