Miscibility enhancement of PP/PBT blends with a side‐chain liquid crystalline ionomer

Abstract

Side-chain liquid crystalline ionomer (SLCI) containing sulfonic acid groups with a polymethylhydrosiloxane main-chain was used in the blends of polypropylene (PP) and polybutylene terephthalate (PBT) as a compatibilizer. The crystalline behavior, morphological, and mechanical properties of the blends were investigated in detail by differential scanning calorimetry (DSC), polarizing optical microscope (POM), Fourier transforms infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). Revealed by the shift of T m in DSC thermogram and the shift of the absorbed peak in FTIR spectra, specific interaction led to stronger interfacial adhesion between these phases, which resulted in much finer dispersion of the minor PBT phase in PP matrix. The SLCI containing sulfonate acid groups acted as physical crosslinking agent along the interface, which compatibilized PP/PBT blends. The mechanical property of the blends including 4 wt % SLCI contents was better than that of other SLCI contents in the blends.

Study of Structure Formation in Side-Chain Liquid Crystal Copolymers by Variable Temperature Fourier Transform Infrared Spectroscopy

“…These spectra reflect changes in the chemical environment of some of the functional groups contained in the mesogenic units, the alkyl spacers, and the polymer backbone of the copolymers in the glass state. − More specifically, the variations seen for the IR stretching bands of the carbonyl bonds, corresponding to the ester and amide groups (st CO, ν ∼ 1727 cm –1 and ν ∼ 1672 cm –1 , respectively), and also for the NH stretching region (ν ∼ 3320 cm –1 ) may be interpreted in terms of changes to the local environments. Thus, two effects can be discriminated.…”

Thermal Behavior, Mechanical Property and Microstructure of Low-Density Polyethylene Filled by Diatomite

“…Tensile Strength (MPa) 13.9 13.0 14.1 14.6 Morphology In order to explore the microstructure distribution and phase structure of the diatomite, the blends were characterized by SEM micrographs. Generally, the morphology of a melt-blended, immiscible polymer blend depends on a variety of factors, including the interfacial tension, the viscosity ratio of the blend components, the volume fraction, and the shear and extensional stresses encountered during processing [12]. Fig.…”

Synthesis and Characterization of Interpenetrating Polymer Network of Poly (Methylhydrosiloxane) and Poly (Acrylonitrile).

“…Through these polymer networks chemically compatible desired phase morphology achieved. Sun et al [5] described side chain liquid crystalline ionomer containing sulphonic acid groups with polymethyl hydrosiloxane (PMHS).…”