doi: bioRxiv preprint their components rapidly with the surrounding medium (Hyman et al., 2014;. Most of the liquid condensates possess common characteristics, which include their formation mechanism as well as their physical properties. For instance, multivalent proteins or nucleic acids associate through weak intermolecular interactions and reach a solubility limit to form liquid condensates (Banani et al., 2017;. These condensates are highly mobile, spherical, but get deformed on physical contact, fuse and eventually relax back to their spherical shape (Brangwynne et al., 2009;Brangwynne et al., 2011;Molliex et al., 2015;Nott et al., 2015). Several proteins undergoing LLPS, however, contain intrinsically disordered regions (IDRs) that are closely associated with prion-like domains (PLDs) and low complexity domains (LCDs) (

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SYNOPSISTensile and impact behavior of CaC03 -filled polypropylene was studied in the composition range 0-60 wt % filler. Tensile modulus increased while tensile strength and breaking elongation decreased with increase in CaC03 content. The modulus increase and elongation decrease were attributed to increased filler-polymer interaction resulting in reduction in molecular mobility, while increased amorphization and obstruction to stress transfer accounted for the tensile strength decrease. Analysis of tensile strength data showed introduction of stress concentration in the composites. Izod impact strength at first increased up to a critical CaC03 content, beyond which the value decreased. Surface treatment of CaC03 with a titanate coupling agent LICA 12 enhances the adhesion of the filler and polymer, which further modifies the strength properties. Scanning electron microscopic studies indicated better dispersion of CaC03 particles upon surface treatment, which effected the changes in the strength properties of the composites.

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SynopsisThis article presents study of melt rheological properties of composites of polypropylene ( z-PP) filled with wood flour (WF), at filler concentrations of 3-20 wt%. Results illustrate the effects of (i) filler concentration and (ii) shear stress or shear rates on melt viscosity and melt elasticity properties of the composites. Incorporation of WF into z-PP results in an increase of its melt viscosity and a decrease of melt elasticity such as die swell and first normal stress differences; these properties, however, depend on filler concentration. Processing temperature of the filled i-PP increases as compared to the nonfilled polymer.

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