Abstract
Spin—lattice and rotating frame relaxation measurements have been made on nine copolymers of styrene with N-n-alkyl maleimides in which the alkyl groups are CH 3, C 2H 5, C 5H 11, C 7H 15, C 9H 19, C 12H 25, C 14H 29, C 16H 33 and C 18H 37. Five relaxations have been detected which are correlated with existing relaxation work. The highest temperature (αβ) relaxation is associated with the glass transition and the γ-relaxation results from ring twisting in the ordered (helical) parts of the structure. The δ-relaxation occurs only in the C 1–C 7 polymers and reflects movement in helical stacking within the ordered phase while the ε-relaxation occurs only in the C 7–C 18 homologues and arises from motion of the pendant alkyl chain in both ordered and disordered regions. The lowest temperature minimum in T 1 is associated in all polymers with methyl rotation. Spin diffusion plays a prominent role in the relaxations and this is used to interpret further the morphology of the samples.
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