End-group

About: End-group is a research topic. Over the lifetime, 6248 publications have been published within this topic receiving 197315 citations.

Reversible Polymers Formed from Self-Complementary Monomers Using Quadruple Hydrogen Bonding

Abstract: Units of 2-ureido-4-pyrimidone that dimerize strongly in a self-complementary array of four cooperative hydrogen bonds were used as the associating end group in reversible self-assembling polymer systems. The unidirectional design of the binding sites prevents uncontrolled multidirectional association or gelation. Linear polymers and reversible networks were formed from monomers with two and three binding sites, respectively. The thermal and environmental control over lifetime and bond strength makes many properties, such as viscosity, chain length, and composition, tunable in a way not accessible to traditional polymers. Hence, polymer networks with thermodynamically controlled architectures can be formed, for use in, for example, coatings and hot melts, where a reversible, strongly temperature-dependent rheology is highly advantageous.

Textbook of polymer science

Abstract: The Science of Large Molecules POLYMERIZATION Step-Reaction (Condensation) Polymerization Radical Chain (Addition) Polymerization Ionic and Coordination Chain (Addition) Polymerization Copolymerization Polymerization Conditions and Polymer Reactions CHARACTERIZATION Polymer Solutions Measurement of Molecular Weight and Size Analysis and Testing of Polymers STRUCTURE AND PROPERTIES Morphology and Order in Crystalline Polymers Rheology and the Mechanical Properties of Polymers Polymer Structure and Physical Properties PROPERTIES OF COMMERICAL POLYMERS Hydrocarbon Plastics and Elastomers Other Carbon-Chain Polymers Heterochain Thermoplastics Thermosetting Resins POLYMER PROCESSING Plastics Technology Fiber Technology Elastomer Technology Appendixes Author and Subject Indexes.

Polymer Brushes via Surface-Initiated Controlled Radical Polymerization: Synthesis, Characterization, Properties, and Applications

Abstract: Keywords: Fragmentation Chain-Transfer ; Self-Assembled Monolayers ; Walled Carbon Nanotubes ; Well-Defined Polymer ; Nitroxide-Mediated Polymerization ; Block-Copolymer Brushes ; Poly(Methyl Methacrylate) Brushes ; Transfer Raft Polymerization ; Quartz-Crystal Microbalance ; Poly(Acrylic Acid) Brushes Reference EPFL-REVIEW-148464doi:10.1021/cr900045aView record in Web of Science Record created on 2010-04-23, modified on 2017-05-10

Introduction to Polymers

Abstract: CONCEPTS, NOMENCLATURE AND SYNTHESIS OF POLYMERS Concepts and Nomenclature The Origins of Polymer Science and the Polymer Industry Basic Definitions and Nomenclature Molar Mass and Degree of Polymerization Principles of Polymerization Introduction Classification of Polymerization Reactions Monomer Functionality and Polymer Skeletal Structure Functional Group Reactivity and Molecular Size: The Principle of Equal Reactivity Step Polymerization Introduction Linear Step Polymerization Non-Linear Step Polymerization Radical Polymerization Introduction to Radical Polymerization The Chemistry of Conventional Free-Radical Polymerization Kinetics of Conventional Free-Radical Polymerization Free-Radical Polymerization Processes Reversible-Deactivation ('Living') Radical Polymerizations Non-Linear Radical Polymerizations Ionic Polymerization Introduction to Ionic Polymerization Cationic Polymerization Anionic Polymerization Group-Transfer Polymerization Stereochemistry and Coordination Polymerization Introduction to Stereochemistry of Polymerization Tacticity of Polymers Geometric Isomerism in Polymers Prepared from Conjugated Dienes Ziegler-Natta Coordination Polymerization Metallocene Coordination Polymerization Ring-Opening Polymerization Introduction to Ring-Opening Polymerization Cationic Ring-Opening Polymerization Anionic Ring-Opening Polymerization Free-Radical Ring-Opening Polymerization Ring-Opening Metathesis Polymerization Specialized Methods of Polymer Synthesis Introduction Solid-State Topochemical Polymerization Polymerization by Oxidative Coupling Precursor Routes to Intractable Polymers Supramolecular Polymerization (Polyassociation) Copolymerization Introduction Step Copolymerization Chain Copolymerization Block Copolymer Synthesis Graft Copolymer Synthesis CHARACTERIZATION OF POLYMERS Theoretical Description of Polymers in Solution Introduction Thermodynamics of Polymer Solutions Chain Dimensions Frictional Properties of Polymer Molecules in Dilute Solution Number-Average Molar Mass Introduction to Measurements of Number-Average Molar Mass Membrane Osmometry Vapour Pressure Osmometry Ebulliometry and Cryoscopy End-Group Analysis Effects of Low Molar Mass Impurities upon Mn Scattering Methods Introduction Static Light Scattering Dynamic Light Scattering Small-Angle X-Ray and Neutron Scattering Frictional Properties of Polymers in Solution Introduction Dilute Solution Viscometry Ultracentrifugation Molar Mass Distribution Introduction Fractionation Gel Permeation Chromatography Field-Flow Fractionation Mass Spectroscopy Chemical Composition and Molecular Microstructure Introduction Principles of Spectroscopy Ultraviolet and Visible Light Absorption Spectroscopy Infrared Spectroscopy Raman Spectroscopy Nuclear Magnetic Resonance Spectroscopy Mass Spectroscopy PHASE STRUCTURE AND MORPHOLOGY OF BULK POLYMERS The Amorphous State Introduction The Glass Transition Factors Controlling the Tg Macromolecular Dynamics The Crystalline State Introduction Determination of Crystal Structure Polymer Single Crystals Semi-Crystalline Polymers Liquid Crystalline Polymers Defects in Crystalline Polymers Crystallization Melting Multicomponent Polymer Systems Introduction Polymer Blends Block Copolymers PROPERTIES OF BULK POLYMERS Elastic Deformation Introduction Elastic Deformation Elastic Deformation of Polymers Viscoelasticity Introduction Viscoelastic Mechanical Models Boltzmann Superposition Principle Dynamic Mechanical Testing Frequency Dependence of Viscoelastic Behaviour Transitions and Polymer Structure Time-Temperature Superposition Effect of Entanglements Non-Linear Viscoelasticity Elastomers Introduction Thermodynamics of Elastomer Deformation Statistical Theory of Elastomer Deformation Stress-Strain Behaviour of Elastomers Factors Affecting Mechanical Behaviour Yield and Crazing Introduction Phenomenology of Yield Yield Criteria Deformation Mechanisms Crazing Fracture and Toughening Introduction Fundamentals of Fracture Mechanics of Fracture Fracture Phenomena Toughened Polymers Polymer Composites Introduction to Composite Materials Matrix Materials Types of Reinforcement Composite Composition Particulate Reinforcement Fibre Reinforcement Nanocomposites Electrical Properties Introduction to Electrical Properties Dielectric Properties Conduction in Polymers Polymer Electronics Answers to Problems Index Problems and Further Reading appear at the end of each chapter.

Molecular Conformation in Oligo(ethylene glycol)-Terminated Self-Assembled Monolayers on Gold and Silver Surfaces Determines Their Ability To Resist Protein Adsorption

Abstract: We report data from infrared absorption (FTIR) and X-ray photoelectron spectroscopies that correlate the molecular conformation of oligo(ethylene glycol) (OEG)-terminated self-assembled alkanethiolate monolayers (SAMs) with the ability of these films to resist protein adsorption. We studied three different SAMs of alkanethiolates on both evaporated Au and Ag surfaces. The SAMs were formed from substituted 1-undecanethiols with either a hydroxyl-terminated hexa(ethylene glycol) (EG6-OH) or a methoxy-terminated tri(ethylene glycol) (EG3-OMe) end group, or a substituted 1-tridecanethiol chain with a methoxy-terminated tri(ethylene glycol) end group and a −CH2OCH3 side chain at the C-12 atom (EG[3,1]-OMe). The infrared data of EG6-OH-terminated SAMs on both Au and Ag surfaces reveal the presence of a crystalline helical OEG phase, coexisting with amorphous OEG moieties; the EG[3,1]-OMe-terminated alkanethiolates on Au and Ag show a lower absolute coverage and greater disorder than the two other compounds. The...