Hydroxy-terminated liquid nitrile rubber modified castor oil based polyurethane/epoxy IPN composites: damping, thermal and mechanical properties

submitted by larint 1 year and 10 months ago - Topic: Chemistry

A series of castor oil based polyurethane (PU)/epoxy resin (EP) graft interpenetrating polymer network (IPN) composites modified by hydroxy-terminated liquid nitrile rubber (HTLN) were prepared. The effects of HTLN content on the phase structure and damping properties of the HTLN modified PU/EP IPN composites were studied by scanning electron microscopy (SEM) and dynamic mechanical analysis (DMA). Thermogravimetric analysis (TGA) showed that the thermal decomposition temperature of the composites increased with increase of HTLN content. The tensile strength and impact strength of the IPN composites were also significantly improved, especially when the HTLN content was 5%. The modified IPN composites were.

submitted by tapi 4 months ago - Topic: Chemistry

Hydroxy terminated polybutadiene is a low molecular weight telechelic, translucent liquid rubber which finds a wide range of applications. The presence of double bonds and hydroxyl end groups can be effectively utilized to chemically modify into various functional groups such as epoxy, urethane, ...

Organogelation behavior, thermal and mechanical properties of polymer network formed by the Diels-Alder reaction of furan- and maleimide-terminated four-arm star-shaped ε-caprolactone oligomers

submitted by Kristian 17 days ago - Topic: Chemistry

Furan- and maleimide-terminated 4-arm star-shaped ε-caprolactone oligomers (F4CLO and M4CLO) were synthesized by the reactions of hydroxy-terminated 4-arm star-shaped ε-caprolactone oligomers (H4CLO) having the degree of polymerization per one oligocaprolactone chain, n = 5 or 10 with furfuryl ...

Preparation of N-vanillyl chitosan and 4-hydroxybenzyl chitosan and their physico-mechanical, optical, barrier, and antimicrobial properties

submitted by amish 1 year and 9 months ago - Topic: Chemistry

Chitosan derivatives such as N-vanillyl chitosan and 4-hydroxybenzyl chitosan were prepared by reacting chitosan with 4-hydroxy-3-methoxybenzaldehyde (vanillin) and 4-hydroxybenzaldehyde. Amino groups on chitosan reacts with these aldehydes to form a Schiff base intermediate, which is later on co...

UV-Irradiation Cured Organic-inorganic Hybrid Nanocomposite Initiated by Ethoxysilane-modified Multifunctional Polymeric Photoinitiator through Sol-gel Process

submitted by popomitol 1 year and 7 months ago - Topic: Chemistry

The UV-cured organic-inorganic hybrid nanocomposite (nano-Si-m-PI) was prepared through the photopolymerization of acrylic resin initiated by ethoxysilane-modified multifunctional oligomeric photoinitiator (Si-m-PI). The esterification reaction of 2-hydroxy-4′-(2-hydroxyethoxy)-2-methylpropioph...

Analysis of preservatives with different polarities in beverage samples by dual-phase dual stir bar sorptive extraction combined with high-performance liquid chromatography

submitted by JaycBrande 4 months ago - Topic: Chemistry

A new concept of “dual-phase dual stir bar sorptive extraction (SBSE)” was proposed to simultaneously extract six preservatives with different polarities (log Ko/w values of 1.27 to 3.41), namely, benzoic acid (BA), sorbic acid (SA), methyl p-hydroxybenzoate (MP), ethyl p-hydroxybenzoate (EP)...

Thermal and Mechanical Analysis of Urethane Acrylate Graft Copolymer Part A: Urethane Macromonomer Base on TDI and EG

submitted by 957896 3 months ago - Topic: Chemistry

Urethane macromonomers (UMs) having different urethane chain lengths (X) were synthesized by the reaction of an isocyanate-terminated prepolymer with 2-hydroxy ethyl methacrylate (HEMA) and isopropanol. The existence and the structural identification of the UMs were verified by FTIR, 1H NMR and 1...

Capillary electrophoresis coupled to mass spectrometry for the determination of anthelmintic benzimidazoles in eggs using a QuEChERS with preconcentration as sample treatment

submitted by loeloempix 3 months ago - Topic: Chemistry

Benzimidazoles (BZDs) are anthelmintic agents widely used in veterinary medicine. Their use in food-producing animals increases the possibility of residues appearing in animal tissues and products. Most analytical procedures reported for the determination of BZDs have been developed based on liqu...

Spectral, thermal and optical–electrical properties of the layer-by-layer deposited thin film of nano Zn(II)-8-hydroxy-5-nitrosoquinolate complex

submitted by chonkezano 1 month ago - Topic: Chemistry

Zinc(II)-8-hydroxy-5-nitrosoquinolate, [Zn(II)-(HNOQ)2 ], was synthesized and assembled as a deposited thin film of nano-metal complex by a rapid, direct, simple and efficient procedure based on layer-by-layer chemical deposition technique. Stoichiometric identification and structural characteriz...

Density functional study on the structural conformations, intramolecular charge transfer and vibrational spectra of 4-hydroxy-3-methoxy-5-nitrobenzaldehyde

submitted by DeclaRyl 1 year and 7 months ago - Topic: Chemistry

In this paper, we report a combined experimental and theoretical study on molecular structure; vibrational spectra of 4-hydroxy-3-methoxy-5-nitrobenzaldehyde (HMN) have been recorded using Fourier transform infrared spectroscopy (FT-IR) and FT-Raman measurements in the region of 4−4 cmand 35−...

Low temperature bleaching and dyeing properties of modified cellulose fabrics with triazine derivative

submitted by ThoHay 1 year and 7 months ago - Topic: Chemistry

Cellulose fabrics were modified with triazine derivative containing multi-cationic groups, 2,4,6-tri [(2-hydroxy-3-trimethyl-ammonium)propyl]-1,3,5-triazine chloride (Tri-HTAC). Low temperature bleaching of modified cellulose fabrics with tetra acetyl ethylene diamine (TAED), tetra acetyl glycine...