Rheology of poly(n‐butyl methacrylate) and its composites with calcium carbonate

Abstract

Poly(n-butyl methacrylate) (PBMA) composites with calcium carbonate (CaCO 3 ) were prepared by in situ radical copolymerization of butyl methacrylate (BMA) and methacrylic acid (MA) with precipitated calcium carbonate. To compare the different rheological behaviors of the monomer mixtures with CaCO 3 and the composites, the steady and dynamic viscosities of BMA/MA/CaCO 3 and poly(BMA/MA/CaCO 3 ) were measured by means of steady and oscillatory shear flows. The viscosity of the mixture BMA/MA/CaCO 3 was found to increase evidently with the increasing of CaCO 3 %. The influence of MA% on viscosity of BMA/MA/CaCO 3 was slight. During the in situ polymerization, the viscosity of the reacting system was measured to be enhanced by a factor of about 10 4 from the monomer/ CaCO 3 mixture to composites. The dependency of zeroshear viscosity on molar mass of PBMA was also investigated. The relation between the zero-shear viscosity and molar mass is 0 ϭ 10 Ϫ15 M w 3.5 . The evolution of the viscosity with the temperature for both PBMA and its composites was obtained and time-temperature superposition was used to build master curves for the dynamic moduli. The flow activation energies were found to be 115.0, 148.6, and 178.7 kJ/mol for PBMA, composite PBMA/CaCO 3 (90/10), and PBMA/MA/CaCO 3 (89/1/10), respectively. The viscosity of the composites containing less than 10% CaCO 3 was lower than that of pure PBMA with the same molar mass.

Polymer nanocomposite powders and melt spun fibers filled with silica nanoparticles

“…These findings are well in accordance with the literature: 17,24,25 With higher filler content, the melt viscosity of high-impact polystyrene/organomontmorillonite nanocomposites 24 and of P(BuMA) CaCO 3 composites 17 was recently found to be increased. The polymer viscosity itself was in addition found to be a function of the filler content.…”

“…While nanosized silica, aluminum oxide, and CaCO 3 particles were already used as fillers for polymer compounding 11,17 or as scratch resistant coatings, 18,19 only few papers are published on fibers filled with inorganic particles. Commonly just low amounts of fillers (pigments) are applied for melt spinning.…”

Lowering the Healing Temperature of Photoswitchable Dynamic Covalent Polymer Networks

“…P3 has a slightly higher glass transition temperature of T g ≈ −37 °C, which is in line with the same trend of the glass transition temperatures of the corresponding homopolymers PLMA (T g ≈ −65 °C) and P(PEGMA 300 ) (T g ≈ −61 °C). [23,38]…”

Plasticization of nano‐CaCO3 in polystyrene/nano‐CaCO3 composites

“…Liang and a coworker 28,29 in their studies on the MFR of ABS/CaCO 3 showed that ABS with 10% nano-CaCO 3 exhibited lower viscosity and a higher MFR than pure ABS with increasing wall shear stress. Chen et al 27 explained in research of PBMA/ CaCO 3 composites that the melting viscosity with 10% CaCO 3 was less than that of PBMA because of the lack of adhesion and probable voiding at the interface between CaCO 3 and the matrix.…”

“…Chen et al 27 in their studies of poly(n-butyl methacrylate) (PBMA)/calcium carbonate composites, reported that the modulus of a composite with 10% CaCO 3 was less than that of PBMA, as observed from the melting viscosity, as a result of the lack of adhesion and probable voiding at the interface between CaCO 3 and the matrix. Liang and a coworker 28,29 revealed that acrylonitrile-butadiene-styrene (ABS) with 10% nano-CaCO 3 exhibited a lower viscosity and a higher melt flow rate (MFR) than pure ABS with increasing wall shear stress.…”