Liquid‐crystalline polymers containing heterocycloalkanediyl groups as mesogens, 6. Liquid‐crystalline poly[trans‐11‐{4‐[5‐(4‐methoxyphenyl)‐1,3‐dioxan‐2‐yl]‐2,6‐dimethylphenoxy}undecyl methacrylate] and poly[trans‐11‐{4‐[5‐(4‐methoxyphenyl)‐1,3‐dioxan‐2‐yl]‐2,6‐dimethylphenoxy}undecyl acrylate]

The synthesis and characterization of poly[trans‐11‐{4‐[5‐(4‐methoxyphenyl)‐1,3‐dioxan‐2‐yl]‐2,6‐dimethylphenoxy}undecyl methacrylate] and poly[trans‐11‐{4‐[5‐(4‐methoxyphenyl)‐1,3‐dioxan‐2‐yl]‐2,6‐dimethylphenoxy}undecyl acrylate] is presented. Both polymers exhibit nematic mesophases and do not present side‐chain crystallization. At temperatures higher than 160°C the 1,3‐dioxane‐2,5‐diyl groups undergo a thermally induced trans‐cis isomerization. A radical mechanism is proposed for this isomerization.