New monomers are described for the synthesis of rod‐like poly(1,4‐phenyleneethynylene)s with long flexible aliphatic side chains. By palladium catalyzed polycondensation soluble polymers with melting points around 100°C could be obtained. The molecular weight was estimated by GPC, VPO and elemental analysis: GPC showed a multimodale distribution with P n = 9–15. NMR spectra were found to be in agreement with the assumed polymer structure, but signals of the acetylenic carbons could not be detected. A broad, structureless absorption with a maximum at λ = 410 nm is seen in the UV‐VIS‐spectra. The thermal decomposition of the substituted PPE's starts at about 400°C and is comparable to that of unsubstituted PPE in air.
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Giesa et al. (1990) studied this question.
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