Polymer blend

About: Polymer blend is a research topic. Over the lifetime, 18474 publications have been published within this topic receiving 437183 citations. The topic is also known as: polymer mixture & Polymerblend 或者 Polyblend.

Polypropylene based polymer blends: Fields of application and new trends

Abstract: The new industrial strategy in the polymer field requires the transformation of plastic “commodities” into “specialties”. From this point of view, polypropylene (PP) plays an important role both for its intrinsic properties such as high melting temperature, low density, high chemical inertness and for its capability to be produced with different morphological and molecular structures, to be modified with the addition of other polymers or mineral fillers and to be grafted with functional groups. The present range of special and reinforced polypropylene grades includes: elastomer-modified PP, elastomer-modified filled PP, glass fiber-reinforced PP, filled PP, esthetic filled PP, flame-retardant PP, and thermoplastic elastomers. New trends for significantly improving this family of polymers involve impact resistance, processability, durability, dimensional stability, elasticity, and surface properties. A positive answer to this complex emerging demand will put, as indicated, in this work, “special and reinforced polypropylene grades” in a position to successfully compete with technopolymers in some important, rapidly growing application sectors.

Dynamics of poly(ethylene oxide) in a blend with poly(methyl methacrylate): a quasielastic neutron scattering and molecular dynamics simulations study

Abstract: In this paper, we have addressed the question of the dynamic miscibility in a blend characterized by very different glass-transition temperatures, Tg, for the components: poly(ethylene oxide) and poly(methyl methacrylate) (PEO/PMMA) The combination of quasielastic neutron scattering with isotopic labeling and fully atomistic molecular dynamics simulations has allowed us to selectively investigate the dynamics of the two components in the picosecond-10 nanoseconds scale at temperatures close and above the Tg of the blend The main focus was on the PEO component, ie, that of the lowest Tg, but first we have characterized the dynamics of the other component in the blend and of the pure PEO homopolymer as reference In the region investigated, the dynamics of PMMA in the blend is strongly affected by the alpha-methyl rotation; an additional process detected in the experimental window 65 K above the blend-Tg can be identified as the merged alphabeta process of this component that shows strong deviations from Gaussian behavior On the other hand, pure PEO displays entropy driven dynamics up to very large momentum transfers Such kind of motion seems to freeze when the PEO chains are in the blend There, we have directly observed a very heterogeneous and moreover confined dynamics for the PEO component The presence of the hardly moving PMMA matrix leads to the creation of little pockets of mobility where PEO can move The characteristic size of such confined islands of mobility might be estimated to be of approximately 1 nm These findings are corroborated by the simulation study, which has been an essential support and guide in our data analysis procedure

Elastomer Technology Handbook

Abstract: Analytical Test Methods for Polymer Characterization (N.P. Cheremisinoff, R. Boyko, and L. Leidy). Chemical Characterization in Polymer Analysis (A.B. Hunter). The Use of Thermal Analysis in Polymer Characterization (M.P. Sepe). Tensile Yield in Polymers (D. Hartmann and D. Sudduth). Mechanochemistry of Polymers Deformation and Fracture Processes (C.V. Oprea and M. Popa). Morphology and Mechanical Properties of Natural Rubber/Polyolefin Blends (J. Sunder). Properties Modelling of Viscoelastic Elastomers (H. So and U.-D. Chen). Interpenetrating Polymer Networks (D. Klempner and D. Sophiea). Catalysts for the Copolymerization of Ethylene-Propylene Elastomers (K. Makino). Thermal and Oxidative Stability of Ethylene-Propylene Rubber (G. Mares and P. Budrugeac). The Nature of Sulfur Vulcanization (M.R. Krejsa and J.L. Koenig). Peroxide Crosslinking of EPDM Rubbers (W.C. Endstra and C.T.J. Wreesmann). Properties and Degradation of Nitrile Rubber (S. Bhattacharjee, A.K. Bhowmick, and B.N. Avasthi). Thermoplastic Elastomers: A Rising Star (M.T. Payne and C.P. Rader). Markets for Thermoplastic Elastomers (R.J. School). Degassing of Thermoplastics during Extrusion with Single-Screw and Co-Rotating Twin-Screw Extruders (G. Martin and W. Schuler). Epoxidized Rubbers (S. Roy, B.R. Gupta, and S.K. De). Toughening Concept in Rubber-Modified High Performance Epoxies (H.-J. Sue, E.I. Garcia-Meitin, and D.M. Pickelman). Characterization of Phase Behavior in Polymer Blends (T. Ougizawa and T. Inoue). Compatibilization of Polymer Blends (R.L. Markham). Rubber Mixing Principles (N.P. Cheremisinoff). Rubber Extrusion Principles (N.P. Cheremisinoff). Blown Film Technology (J.D. Culter). Principles of Adhesive Rheology (F.M. Chen). Adhesion between Components of Elastomeric Composite Materials (Y. Kubo). Polymer Applications in the Construction Industry (R. Hussein and N.P. Cheremisinoff). Polymers in Sandwich Construction (R. Hussein). Polymer-Concrete Composites (R. Hussein). Properties of Polymers Suitable for Solar Energy Applications (R. Hussein). Appendices. Index.