3 edition of LaRC-ITPI/arylene ether copolymers found in the catalog.
LaRC-ITPI/arylene ether copolymers
by National Aeronautics and Space Administration, Langley Research Center in Hampton, Va
Written in English
|Statement||Brian J. Jensen, Dennis C. Working.|
|Series||NASA technical memorandum -- 104099.|
|Contributions||Working, Dennis C., Langley Research Center.|
|The Physical Object|
USA USA USA US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords vinyl ether copolymer perfluoro molding powder tetrafluoroethylene Prior art date Legal status (The legal status is an assumption and is not a legal by: Using amine/acyl chloride solutions or interface polymerization technology one can prepare various block copolymers. Nylon 6/6,6/aromatic polyamide block copolymers have been proposed as dispersion adjuvants in mixed solutions of aliphatic and aromatic nylons that are studied for making composites. The miscibility of different.
IMIDE/ARYLENE ETHER COPOLYMERS Brian J. Jensen, Ph.D. Virginia Commonwealth University Major Director: Dr. R. G. Bass Three different series of imide/arylene ether block copolymers were prepared using two different imide blocks and two different arylene ether blocks. Block molecular weights studied were and g/mole forCited by: 1. Trivalent cobalt-based catalyst systems have proven to be efficient for the coupling of CO 2 with epoxides to afford the corresponding polycarbonates with perfectly alternating nature. Particularly, the single-component Co(III)–Salen complexes with an intramolecular cocatalyst exhibit excellent activity and selectivity for the formation of polycarbonates from various epoxides even at very.
First, the radical copolymerisation of CTFE with a tertiary amine-carrying vinyl ether led to low molecular weight-copolymers with an imperfect structure. That copolymerisation and the quaternisation of the amino groups using methyl iodide were however accompanied by side reactions, including transfer reactions and significant loss of Cited by: 3. The Effect of Radiation on Properties of Polymers examines the effects of radiation on plastics and elastomers. Polymers are required in products or parts for a range of cutting-edge applications that are exposed to radiation, in areas such as space, medicine, and radiation Edition: 1.
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LaRC-ITPI/arylene ether copolymers book ether copolymers (SuDoc NAS ) [Brian J. Jensen] on *FREE* shipping on qualifying : Brian J. Jensen. 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.
LaRC-ITPI/arylene ether copolymers [microform] / Brian J. Jensen, Dennis C. Working National Aeronautics and Space Administration, Langley Research Center Hampton, Va Wikipedia Citation Please see Wikipedia's template documentation for further citation fields that may be required.
The arylene ether block used in this study contains a bulky fluorene group in the polymer backbone while the imide block contains an arylene ketone segment similar to that in the arylene ether block and has been named LaRC-ITPI. A series of imide/arylene ether block and segmented copolymers were prepared and : Brian J.
Jensen and Dennis C. Working. LaRC-ITPI/Arylene Ether Copolymers by B. Jensen NASA Langley Research Center Hampton, VA and D. Working Analytical Services and Materials, Inc. Hampton, VA Introduction As part of an effort to develop high performance structural resins for.
LaRC-ITPI/arylene ether copolymers [microform] / Brian J. Jensen, Dennis C. Working; Oxygen plasma resistant phosphine oxide containing imide/arylene ether copolymers [microform] / Brian J. Imide/arylene ether copolymers [microform]: patent application.
Buy LaRC-ITPI/arylene ether copolymers (SuDoc NAS ) by Brian J. Jensen (ISBN:) from Amazon's Book Store. Everyday low prices and free delivery on eligible : Brian J.
Jensen. The perfluoroalkylsulfonate monomer, N,N-diisopropylethylammonium 2,2-bis(p-hydroxyphenyl)pentafluoropropanesulfonate (HPPS), was synthesized in three steps. Using triethyl phosphite, hexafluoroacetone was first converted to ethyl pentafluoroisopropenyl ether.
Reaction of the ether with sulfur trioxide produced 2-ketopentafluoropropanesulfonic acid. The acid was condensed Cited by: Imide/arylene ether copolymers with pendent trifluoromethyl groups. Hampton, Va.: [Springfield, Va: National Aeronautics and Space Administration, Langley Research Center ; For sale by the National Technical Information Service.
MLA Citation. Jensen, Brian J. and Havens, Stephen J. and Langley Research Center. The book basically deals with new raw materials for cost reduction of alkyds and unsaturated polyester, Allyl Ether Copolymers Uses Unsaturated Polyesters and Alkyds Unmodified Allyl Ether Polyesters Synthetic Resins Technology Handbook.
Summary This chapter contains sections titled: Introduction Synthesis and Micro‐phase Separated Morphology Nomenclature, Properties and Relevant Area Applications Compounding and Special Additives Cited by: 2. Oxygen plasma resistant phosphine oxide containing imide/arylene ether copolymers [microform] / Brian J.
Jensen National Aeronautics and Space Administration, Langley Research Center ; National Technical Information Service, distributor Hampton, Va.: [Springfield, Va Australian/Harvard Citation.
Jensen, Brian J. & Langley Research Center. Imide/arylene ether copolymers patent application (SuDoc NAS LARCU) [Jensen, Brian J.] on *FREE* shipping on qualifying offers. Imide/arylene ether copolymers patent application (SuDoc NAS LARCU)Author: Brian J. Jensen. Imide/arylene ether copolymers [microform]: patent application National Aeronautics and Space Administration Washington, D.C Australian/Harvard Citation.
Jensen, Brian J. & Hergenrother, P. & Bass, Robert G. & United States. National Aeronautics and Space Administration. Synthesis of (Poly(chloroethyl vinyl ether)-g-polystyrene)comb-b-(poly(chloropyran ethoxy vinyl ether)-g-polyisoprene)comb Copolymers and Study of Hyper-Branched Micelle Formation in Dilute by: A modified Friedel–Crafts synthesis has been used to make two series of aromatic ether–ketone–imide copolymers.
All the copolymers were semicrystalline and, in some cases, useful combinations of glass-transition temperature and melt temperatures were found. Some properties of the copolymers are reported and discuss.
Copolymer sequence is another feature that can have an important impact on the macroscopic behavior of a polymer synthesized from more than a single monomer. Some of the possible copolymer architectures are shown in Fig. and include random, alternating, block, and graft architecture can have a profound effect on the appearance of the NMR spectra.
Poly(ether amide) block copolymers have been investigated as potential antistatic compounds. High molecular weight materials were proposed as elastomers and they are used as elastomeric additives in nylon plastics to prepare impact-resistant grades.
Preparation is straightforward,given the availability of α,ω-diaminopolyethers. (Polyether)diols, which are more widely. A block copolymer is a linear copolymer with one or more long uninterrupted sequences of each type of monomer unit (M A M A M A M A M A M B M B M B M B M B).
A graft copolymer is a branched copolymer with the main chain and branches having different compositions. This section deals exclusively with random and alternating copolymers. * Corresponding authors a Center for Nanoscale Science and Engineering, North Dakota State University, Fargo, USA.
b Department of Chemistry and Cited by:. Cyclopolymerization of a divinyl monomer, where two different vinyl groups, that is, acrylate and vinyl ether, are connected via an ester bond, was performed under diluted condition with nitroxide-meditated radical polymerization (NMP).
Both vinyl groups were consumed at almost same rate under suitable condition, although the inherent cross-propagation ability between the two vinyl groups are Cited by: 9.ether) - Copolymer PFA. Teflon PFA. Excellent Excellent Excellent Excellent Excellent Excellent - Excellent Excellent All information and technical data are given as a guide only.
Although every effort has been made to ensure that the information is correct, no warranty is given as to its completeness.Poly(ester-b-ether)s, a kind of meaningful and potentially bio-based block copolymer, are typically synthesized via ring-opening polymerization (ROP) of cyclic esters initiated by the pre-prepared polyether r, a multi-step procedure is required in this traditional method.
Herein, we detailed a one-step selective copolymerization process of mixed monomers to precisely.