According to Marchessault et al. [177], mcl-PHAs couldbe classified as thermotropic liquid crystals. The conforma-tion was found to be “herringbone” or “comblike” – and itwas not found to be possible to distinguish between the twopossibilities. Polyhydroxyoctanoate (PHO) was found to beabout 25% crystalline. The structure was pseudo-networkin character with an initial modulus around 10–20 timesgreater than that of a slightly crosslinked rubber.