Properties of Poly(4-hyderoxybenzoate) Oligomer and its Blends with Poly(trimethylene Terephthalate)

Abstract

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.

Highly renewable, thermoplastic tetrapolyesters based on hydroquinone,p‐hydroxybenzoic acid or its derivatives, phloretic acid, and dodecanedioic acid

“…The assignments of the chemical shifts for the carboxylic acid end groups (EGs) of DodA, PhlA, and SyrA could be verified using a few available literature references and additional spectroscopic data. The spectra of these tetrapolyesters were compared to those of the free acids and the acetylated forms of each of the three monomers.…”

NMR of liquid crystals and micellar solutions

“…22 The newly synthesized poly(4-hydroxybenzoate) (PHBA) oligomer is a thermotropic liquid crystal with the nematic characteristics. 23 Some interesting papers have been published concerning the thermotropic behaviour of lipid mixtures. The binary systems of N-hexadecanoyl-D-erythro-ceramide (C16-ceramide) or N-hexadecanoyl-D-erythro-ceramide-1-phosphate (C16-ceramide-1-phosphate; C16-C1P) with 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) were studied with DSC and 2 H-NMR.…”