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Showing 1 to 20 of 50 for “"polyamides"”.
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Constitutional isomerism in liquid crystalline polyamides
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1988.
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Interaction of Polyamides With Acids and Bases
Made available in DSpace on 2014-12-05T19:36:01Z (GMT). No. of bitstreams: 1 0010449.pdf: 3590520 bytes, checksum: ccfc74c915ba7bc1672c331bc6e51288 (MD5) Previous issue date: 1954
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Toughening and fracture mechanisms of rubber modified polyamides
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1995.
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Isocyanate-derived organic aerogels: polyurethanes, polyureas, polyamides and polyimides
… (b) water (polyureas); (c) carboxylic acids (polyamides); and, (d) acid anhydrides (polyimides). All processes are invariably single-step, one-pot and take place at room temperature or slightly elevated temperatures. The resulting materials are robust, they have very wide range of densities …
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Mannaric Acid and Mannaric Acid Polyamides: Synthesis and Characterization
… of the C-2 axis of symmetry and chirality, polyamides derived from D-mannaric acid are chiral and stereoregular. D-Mannaric acid has been used here as an aldaric acid monomer for a new method of synthesizing polyhydroxypolyamides, PHPAs, based on a stoichiometrically balanced 1:1 ratio of …
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Mannaric Acid and Mannaric Acid Polyamides: Synthesis and Characterization
… of the C-2 axis of symmetry and chirality, polyamides derived from D-mannaric acid are chiral and stereoregular. D-Mannaric acid has been used here as an aldaric acid monomer for a new method of synthesizing polyhydroxypolyamides, PHPAs, based on a stoichiometrically balanced 1:1 ratio of …
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Synthesis and characterisation of biobased polyamides and their cellulose nanocomposites
The development of biobased polyamides has attracted growing interests in recent years due to the availability of more biobased monomers, namely dicarboxylic acids, and diamines. This doctoral thesis is focused on the preparation of wholly biobased polyamides and their nanocomposites and the …
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Hyperbranched Aromatic Polyesters and Their Application in Blends of Linear Polyamides
… as additives in the blends of linear polyamides were investigated.
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Kinetic studies of solid-phase polycondensation in two polyamides and a polyester
… and time on the continued condensation of two polyamides: poly(hexamethylene adipamide) and poly(hexamethylene sebacamide), and a polyester, poly(ethylene terephthalate), were studied experimentally. The polyamides were held at elevated temperatures from 120 to 180 °C for periods of 5 to 20 …
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New family of unsaturated polyamides from novel long-chain biomass-derived diacids
<p>A new class of bio-based aliphatic unsaturated polyamides (PA) is synthesized from C16-rich monounsaturated diacid (C16:1 diacids). C16:1 diacids are derived from fermented biomass intermediates through multistep purifications and hydrolysis. In this regards, we start with a biomass derived …
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Fundamental Modeling of Solid-State Polymerization Process Systems for Polyesters and Polyamides
The dissertation describes and assembles the building blocks for sound and accurate models for solid-state polymerization process systems of condensation polymers, particularly poly(ethylene terephthalate) and nylon-6. The work centers on an approach for modeling commercial-scale, as opposed to …
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Supramolecular polymer additives to improve the crystallization behavior and optical properties of polybutylene terephthalate and polyamides
… properties of polybutylene terephthalate and polyamides. In the first chapter the influence of the molecular structure of 1,3,5-benzenetrisamides on the nucleation behavior of polybutylene terephthalate was investigated. In order to explore structure property relations, 43 derivatives were …
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Synthesis and characterization of high performance polymeric materials: poly(arylene ethers), polyamides, polyesters and liquid crystalline polyarylates
Poly(arylene ether)s (PAEs) were synthesized via the silyl ether displacement route. Both AA, BB, and AB silylated monomers were prepared by partial or complete hydrolysis of the dihalide using potassium hydroxide in aqueous dimethyl sulfoxide followed by silylation with hexamethyl disilazane. Both …
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Synthesis of functionalized polyamide 6 by anionic ring-opening polymerization
… a hydrophobic surface; (ii) the synthesis of polyamides 6 bearing pendant cinnamoyl groups, which are thermo- and photoresponsivechromophore groups, and demonstrating their reversible crosslinking as well as improved thermo-mechanical properties; (iii) the copolymerization ofCL with a …
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Síntesis, caracterización, propiedades y aplicaciones de nuevas poliamidas aromáticas con subestructuras benzoéter corona y benzopodandos en la cadena lateral
… the synthesis and characterization of 30 novel polyamides containing the benzo-12-crown-4, benzo-15-crown-5 and benzo-18-crown-6 subunit and its dipodal counterpart. The anomalous polymerization of some of the diacid monomers, that leads to insoluble gels under standard Yamazaki polymerization …
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