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Novel polymers are synthesized from 5‐phenyl‐2‐norbornene (PhNb) and its saturated side group analog, 5‐cyclohexyl‐2‐norbornene, using ring‐opening metathesis polymerization (ROMP). Polymers of both endo‐rich and all‐exo PhNb show glass transition temperatures (Tg) = 88 ± 1 °C, indicating a negligible effect of monomer stereoisomerism on segmental packing or the energy barriers to motion at the glass...
Statistical incorporation of a comonomer into polyethylene is well known to reduce its crystallinity, and consequently the small-strain modulus. However, we have found that when the comonomer is methacrylic or acrylic acid, the modulus of homogeneous copolymers initially decreases and then increases with increasing comonomer content. The modulus increase is traced to an elevation of the amorphous...
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