3 edition of Exploratory development of foams from liquid crystal polymers found in the catalog.
Exploratory development of foams from liquid crystal polymers
by National Aeronautics and Space Administration, Langley Research Center in Hampton, Va
Written in English
|Series||NASA contractor report -- 172510., NASA contractor report -- NASA CR-172510.|
|Contributions||Celanese Research Company., Langley Research Center.|
|The Physical Object|
Liquid crystal polymers exhibit the same liquid crystalline phases and mesophases exhibited by low molar mass mesogens. Main chain liquid crystal polymers have repeating mesogenic units that form a long chain. Side chain liquid crystal polymers were realised in when Ringsdorf and coworkers inserted a flexible spacer unit between the rigid Author: Peter J. Collings, Michael Hird. The terms 'liquid crystal' or 'liquid crystal display' (LCD) are well-known in the context of flat-screen televisions, but the properties and history of liquid crystals are little understood. This book tells the story of liquid crystals, from their controversial discovery at the end of the nineteenth century, to their eventual acceptance as.
Liquid Crystal Polymers (LCP) 2. FORMATION OF URETHANE FOAMS Introduction The Chemistry of Foam Formation and cure 1. Reaction of Isocyanates 2. Function of the isocyanate in Foaming 3. Role of Catalysts in Foam systems A. The Tertiary Amine Catalysts B. The Tin Catalysts C. Mixed Catalysts Systems The Final Cure of Urethane Foams. Polymeric Foams and Foam Technology 2E 2nd Edition by Daniel Klempner (Author) ISBN Cited by:
Liquid Crystals Liquid Crystalline Polymers Synthesis Properties Applications Characterization Wang, X.; Zhou, Q. Liquid Crystalline Polymers. N.J World Scientific: Singapore, 3 Liquid Crystals (LC) Two Types Thermotropic - Phase transitions occur as temperature changes. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.
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This report entitled "Exploratory Development of Foams from Liquid Crystal Polymers" was released by the author in December Contractor Administrator for Celanese Research Company was Mr. William D. Timmons, assisted by Jean E. Hileman. Technical assistance was provided by Dr.
Gary E. Williams and Dr. Sunil K. Garg. Get this from a library. Exploratory development of foams from liquid crystal polymers. [Tai-shung Chung; Celanese Research Company.; Langley Research Center.]. Two types of liquid crystal polymer (LCP) compositions were studied and evaluated as structural foam materials.
One is a copolymer of 6-hydroxynaphthoic acid, terephthalic acid, and p-acetoxyacetanilide (designed HNA/TA/AAA), and the other is a copolymer of p-hydroxybenzoic acid and 6-hydroxynaphthoic acid (designated HBA/HNA).Author: T. Chung.
Liquid crystalline polymers: development trends and photocontrollable materials Valery P. Shibaev, Alexey Yu. Bobrovsky Department of Chemistry, Lomonosov Moscow State University Leninskie Gory 1, stroenie 3, Moscow, Russian Federation Contents I.
Introduction II. Liquid crystals and liquid crystalline polymers. General concepts by: Liquid crystals for functional nanomaterials: Electroclinic artificial muscle polymers, nanorods from ac Dynamics of polymeric liquids; Optical fibre junction based on liquid crystals [microform] / Barry J.
Keon; Exploratory development of foams from liquid crystal polymers [microform] / Tai-shung Chung. Some of these properties have been utilized in new products and some have yet to be used. Much published work has appeared that deals with specific materials or particular applications, and it was felt that a book was needed to examine and explain the underlying principles governing the diverse properties of these liquid crystal polymers, LCPs.
The book discusses several papers concerning the development and advancement of the research and application aspects of liquid crystals. The text is comprised of 52 chapters that are organized into four parts explaining an aspect of liquid crystal.
Polymer Liquid Crystals covers the significant developments in the field of highlight oriented polymers. This chapter book emerged from lectures presented during the seminar "Polymer Liquid Crystals: Science and Technology", held at Santa Margherita Ligure, Italy on MayTry the new Google Books.
Check out the new look and enjoy easier access to your favorite features Liquid-Crystal Polymers formation fraction fragments function heat higher important increase indicates isotropic layer LC polymers length limit linear liquid crystals liquid-crystalline low-molecular-weight macromolecules main chain.
Liquid crystal polymers (LCPs) are a class of aromatic polymers. They are extremely unreactive and inert, and highly resistant to fire. LCPs combine the material properties of both polymers and liquid crystals. Polymers containing rigid segments may also exhibit a liquid crystalline phase.
With proper processing methods, this can give rise to Cited by: Polymer foams are promising for sound absorption applications. In order to process an industrial product, a series of polystyrene (PS) composite foams were prepared by continuous extrusion foaming assisted by supercritical CO 2.
Because the cell size and cell density were the key to determine the sound absorption coefficient at normal incidence. Modeling Complex Liquid Crystals Mixtures: From Polymer Dispersed Mesophase to Nematic Nanocolloids Ezequiel R. Soule and Alejandro D. Rey 1. Institute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), J.
Author: Ezequiel R. Soule, Alejandro D. Rey. 3D biodegradable and highly regular foamlike cell scaffolds based on biocompatible side-chain liquid crystal elastomers have been prepared. Scaffolds with a primary porosity characterized by spatially interlaced, interconnected microchannels or an additional secondary porosity featuring interconnected microchannel networks define the novel elastomeric by: Few foam systems stabilized by solid particles have been reported, and usually the particles have been used in combination with surfactants.
We report how foams can be stabilized solely with a new class of anisotropic particles, hydrophobic polymer microrods of diameter less than 1 μm and length of a few tens of micrometers. The obtained foams were extraordinary stable, retaining a constant.
Liquid crystal polymers (LCPs) have a wide range of uses, from strong engineering plastics to delicate gels for use in liquid crystal (LC) displays.
For this reason, it is essential reading for materials scientists, engineers or technologists in industry, as well as research laboratories or academia. An additional indexed section containing several hundred abstracts from the Rapra Polymer Reviews: 1. The obtained PSCTLCP is a nematic liquid crystal polymer; the liquid crystal phase exists in a temperature range of to °C, and its initial thermal decomposition temperature is as high as °C, which matches the processing temperature of MH/LLDPE composites.
In the midst of new research for alternative, environmentally friendly foaming agents, Thermoplastic Foam Processing: Principles and Development gives the reader a clear understanding of the current trends in R & D and an up-to-date review of the state of the art in thermoplastic foam : $ 3 States of Aggregation in Polymers Introduction Linear Amorphous Polymers Orientation in Linear Amorphous Polymers Crystalline Polymers Orientation and Crystallization Liquid Crystal Polymers Cross-Linked Structures Polyblends Summary 4 Relation of Structure to Thermal and Mechanical Properties Book Edition: 5.
Foam stabilized by the lamellar liquid crystal dispersion in the aqueous solutions of the QD and QD systems are less stable compared to the foam stabilized by the α-solid dispersion in the. thermotropic liquid crystal. An important diﬀerence between a classical foam and a liquid crystal foam is the role of elastic distortions due to defects near the surface[16, 17].
Recent studies on ﬁlms made from liquid crystals show that edge dislocations. “From biomaterial, biomimetic, and polymer to biodegradable and biocompatible liquid crystal elastomer cell scaffolds”.
ACS Books, Books: Advances .Experimental and theoretical estimations of surface tensions for commercial liquid crystalline polymers, VectraTM A, B and XydarTM SRT Article Jun Historical Development of Polymeric Foams The first cellular polymer to be placed on the market was sponge rubber which was developed as early as It was produced by the addition of gas generating chemicals like sodium and ammonium carbonate or sodium polysulfide to natural.