نتایج جستجو برای: unsaturated polymer

تعداد نتایج: 109327  

Journal: :Polymer Degradation and Stability 2021

The effect of γ-radiation dosage on the thermal stability cross-linked acrylic polymer "Carbomer-140" (СRB) was investigated. DTA, TGA, and DTG curves show multistage processes occurring in different temperature ranges heating CRB from 25 °C to 500 °C. rates decomposition were determined 40–110 °C, 180–260 260–330 330–500 In combination with results electronic structure calculations, potential ...

Journal: : 2021

It was advised to use aliphatic, cycloaliphatic, aromatic petroleum resins and their derivatives obtained by oxidation of with a mixture hydrogen peroxide acetic acid as bitumen polymer-modifiers. Petroleum were ionic polymerization unsaturated compounds liquid pyrolysis products under the influence titanium tetrachloride-diethylaluminium chloride catalyst. established that maximum values adhes...

1997
Tu Lee Nan Yao Ilhan A. Aksay

Atriblock copolymerof polystyrene-polybutadiene-polystyrene (KratonD1102)hasbeenused topattern barium titanate precursor with nanoscale modulations. The copolymer self-assembles to yield cylindrical polystyrene nanodomains in a polybutadiene matrix. The preorganized thin films of polymer are then selectively OH-functionalized in situ on the unsaturated carbon bonds in the polybutadiene matrix w...

Journal: :Molecules 2016
Shuang Ma Patrick H Toy

The study of N-heterocyclic carbenes (NHCs) as organocatalysts has proliferated in recent years, and they have been found to be useful in a variety of reactions. In an attempt to further expand their utility and to study their recyclability, we designed and synthesized a series of self-supported NHCs in which the catalytic carbene groups form part of a densely functionalized polymer backbone, a...

Journal: :Journal of composites science 2022

Polymer concrete (PC) is a composite construction material that boasts several advantages, such as lightness, low water permeability, high resistance to corrosive environments, and chemical degradation. Consequently, it has recently attracted interest an alternative the traditional ones for civil applications. In this study, unsaturated polyester resin was considered matrix phase of PC. Aimed p...

ژورنال: مواد پرانرژی 2015
زمانی, مهوش, سالاری منش, فریده, شهیدزاده, منصور,

Hydroxyl terminated polybutadien that is known as HTPB resin is a liquid hydrocarbon polyol that is commonly used in preparation of solid composite propellants. Because of unsaturated nature of repeating unit of HTPB polymer , it has high potential for oxidative aging . In this paper ,we have investigated aging behaviors of two types of HTPB which having various content of phenolic antioxida...

2014
A. Peetsalu

Current research concentrates on the impact properties of a particle reinforced polymer matrix composite material. The composite material consists of unsaturated polyester resin that is reinforced with aluminium hydroxide. Aluminium hydroxide acts as the hard phase and polyester as the binding agent. The aim of the work was to understand how the particle size and the filler material’s mass frac...

2012
Helmut Ritter Jia Cheng Monir Tabatabai

A macromonomer 5 consisting of a polymerizable vinylcyclopropane end group and a poly(N-isopropylacrylamide) (poly(NiPAAm)) chain was obtained from amidation of 1-ethoxycarbonyl-2-vinylcyclopropane-1-carboxylic acid (4) with an amino-terminated poly(NiPAAm) 3 as an example. This macromonomer 5 showed an LCST effect after complexation of the vinyl end group with ß-cyclodextrin in water. Via radi...

ژورنال: مواد پرانرژی 2021

Unsaturated polyesters have several applications in organic chemistry such as click reaction, radical reaction, etc. In this research, in the first step, a new and inert type of unsaturated binder containing internal alkyne groups was synthesized. For this purpose, condensation polymerization of 2-butyne-1,‌4-diol, and DL-malic acid was performed at 130 °‌C without solvent. Thermal properties w...

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