Synthesis, Characterization, and Theory of Polymeric Networks and GelsShaul M. Aharoni Polymer science is a technology-driven science. More often than not, technological breakthroughs opened the gates to rapid fundamental and theoretical advances, dramatically broadening the understanding of experimental observations, and expanding the science itself. Some of the breakthroughs involved the creation of new materials. Among these one may enumerate the vulcanization of natural rubber, the derivatization of cellulose, the giant advances right before and during World War II in the preparation and characterization of synthetic elastomers and semi crystalline polymers such as polyesters and polyamides, the subsequent creation of aromatic high-temperature resistant amorphous and semi-crystal line polymers, and the more recent development of liquid-crystalline polymers mostly with n~in-chain mesogenicity. other breakthroughs involve the development of powerful characterization techniques. Among the recent ones, the photon correlation spectroscopy owes its success to the advent of laser technology, small angle neutron scattering evolved from n~clear reactors technology, and modern solid-state nuclear magnetic resonance spectroscopy exists because of advances in superconductivity. The growing need for high modulus, high-temperature resistant polymers is opening at present a new technology, that of more or less rigid networks. The use of such networks is rapidly growing in applications where they are used as such or where they serve as matrices for fibers or other load bearing elements. The rigid networks are largely aromatic. Many of them are prepared from multifunctional wholly or almost-wholly aromatic kernels, while others contain large amount of stiff difunctional residus leading to the presence of many main-chain "liquid-crystalline" segments in the"infinite" network. |
Contents
Fractal Properties of Branched Polymers | 1 |
FractalRigidFlexible Networks | 13 |
The Fractal Nature of OneStep Rigid Networks and Their Gels | 31 |
Copyright | |
23 other sections not shown
Other editions - View all
Synthesis, Characterization, and Theory of Polymeric Networks and Gels Shaul M. Aharoni Limited preview - 2012 |
Synthesis, Characterization, and Theory of Polymeric Networks and Gels Shaul M. Aharoni No preview available - 2012 |
Synthesis, Characterization, and Theory of Polymeric Networks and Gels Shaul M Aharoni No preview available - 1992 |
Common terms and phrases
acid angle aromatic polyamide BCB PC behavior bonds calculated Chem chlorobutyl rubber coefficient concentration copolymers correlation length crosslinking crystallization curves cycles cyclization decrease dependence DGET dielectric diffusion distribution DuĊĦek dynamic light scattering dynamic mechanical Edited by S.M. effect elastic elastomers entanglements epoxy equation excluded volume experimental exponent Figure flexible Flory fractal free energy frequency gel point gelation hypercrosslinked increase initial interactions ionomer isocyanate isotropic kinetic LCT's linear liquid crystalline Macromolecules MCDE measurements mechanical mesogenic mesophase modulus molecular deformation tensor molecular weight molecules monomer nematic network formation Networks and Gels observed obtained one-step orientation parameter pendant persistence length phase transition Phys polymer networks polystyrene predictions properties ratio reaction reactivity relaxation rigid networks S.M. Aharoni samples shown simulations solution solvent stiff stress structure swelling synthesis Table temperature Theory of Polymeric toluene torsion values worm-like chain