Properties of Poly(4-hyderoxybenzoate) Oligomer and its Blends with Poly(trimethylene Terephthalate)
The poly(4-hydroxybenzoate) (PHBA) oligomer was synthesized by using the monomer of 4-acetoxybenzoic acid (PABA), and its blends with poly(trimethylene terephthalate) (PTT) are prepared by melt-blending at 250oC in nitrogen. Their chemical structure characterization and crystal morphology were investigated by using the fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (1HNMR), and polarizing optical microscopy, respectively. The results suggest that PHBA oligomer with 3 polymerization degree was synthesized and it is a thermotropic liquid crystal with the nematic characteristics. When the blends crystallize from melt, because the rigid oriented PHBA molecules becomes the nucleating agents for PTT molecules’ crystallization, much transcrystalline layers formed in the blends, although the crystalline PTT/PHBA blends show spherulites morphology character without observing nematic LC phase.
Yuan Ming Huang
M. T. Run et al., "Properties of Poly(4-hyderoxybenzoate) Oligomer and its Blends with Poly(trimethylene Terephthalate)", Key Engineering Materials, Vols. 428-429, pp. 150-153, 2010