Polymer Alloys

Alloy is a term commonly associated with metals and implies a composite which may be sinqle phase (solid solution) or heterophase. Whichever the case, metallic alloys generally exist because they exhibit improved properties over the base metal. There are numer­ ous types of metallic alloys, including interstitial solid solutions, substitutional solid solutions, and multiphase combinations of these with intermetallic compounds, valency compounds, electron compounds, etc. A similar situation exists with polymers. There are numerous types of composites, or "alloys" of polymers in existence today with new ones being created continuously. Polyblends are simple physical mixtures of the constituent polymers with no covalent bonds occuring between them. As with metals, these may be homogeneous (single phase) solid solytions or heterogeneous (multiple phase) mixtures. With polymers, the latter case is by far the most prevalent situation due to the thermodynamic incompatibility of most polymers. This is due to the relatively small gain in entropy upon mixing the polymers due to contiguity restrictions imposed by their large chain length.

Contenu

Advanced Polymer Alloys Containing Poly-Phosphonate Components.- An Approach to New Polymeric Materials via Blocks, Grafts, and Blends.- The Crystallization Behavior of Blends of Low Density Polyethylene and Poly(?-Caprolactone).- Elastomer Blends - Improved Strength Properties of Uncured Rubber Compounds.- Physical and Mechanical Properties and Morphology of Mixtures of High Impact Polystyrene with Homopolystyrene.- Rheoptical Studies of Blends of Poly(Styrene-B-Butadiene-B-Styrene) and Polystyrene.- Barrier and Surface Properties of Polyurethane-epoxy Interpenetrating Polymer Networks.- Novel Plastics and Elastomers from Castor Oil Based IPN's: A Review of an International Program.- Normal and Unusual Morphologies in Blends of AB-Crosslinked Polymers.- Block-Graft Copolymers by Grafting Pivalolactone to Polyisoprene and Polyisobutylene.- Graft Copolymers of Pivalolactone: Synthesis and Properties.- Physical Characterization of Pivalolactone Grafted Elastomers II. Orientation Behavior.- Syntheses of Block Copolymers by Ring-Opening Polymerization.- The Preparation of Styrene Block Copolymers from Macroradicals Produced in Viscous Media.- Phase Separation in Styrene- ? -Methyl Styrene Block Copolymers.- The Dependence of the Dynamic Mechanical Properties of Poly[(l, 4-Cyclohexane)Bismethylene Isophthalate]-b-Polycaprolactone Copolymers on Segment Size and Crystallinity.- Structure-Property Relationships of Polyurethanes Based on Toluene Diisocyanate.- Effect of Annealing on the Morphology and Properties of Thermoplastic Polyurethanes.- The Effect of Cross-linking on the Dynamic Mechanical Properties of an Incompatible, Segmented Polyurethane.- Interaction of Water with Hydrophilic Polyether Polyurethanes: DSC Studies of the Effects of Polyether Variations.- Some Recent Developments in Rubber Modified Polymers. Influence of Block and Graft Copolymers on Morphology and Properties.- Grafting Kinetics in the Case of Rubber Modified Polymers. ABS and HIPS Systems.- Thermal Graft Copolymerization of Styrene with Rubber I. Kinetics of Graft Copolymerization of Styrene with Polybutadiene.- Thermal Graft Copolymerization of Styrene with Rubber. II. Topochemistry of Styrene Copolymerization with Polybutadiene in Bulk and its Connection with High Impact Polystyrene Morphology.- Thermal Graft Copolymerization of Styrene with Rubber III. Temperature Regime Influence of Styrene Copolymerization with Polybutadiene on High Impact Polystyrene Morphology.- Thermal Graft Copolymerization of Styrene with Rubber IV. The Peculiarities of the Process of Producing High Impact Polystyrene by Means of Continuous Methods.- Grafting Isobutylene from SBR.- Synthesis and Characterization of Poly(Chloroprene-g-Isobutylene).- Kinetics and Mechanism of the Early Stages of Polymerization in the Styrene-Polybutadiene System.- Graft Copolymerization of Vinyl Monomers with Synthetic Rubbers in the Presence of Complexing Agents.- Viscoelastic Properties of Poly(ethylene-G-styrene).- Synthesis and Thermal Analytical Characterization of Chlorinated Poly-ethylene-g-styrene.- Photoassisted Modification of and Grafting to Polyethylene.- List of Contributors.