نتایج جستجو برای: graft copolymer

تعداد نتایج: 95531  

2011
Hang T. T. Phan Kaizheng Zhu Anna-Lena Kjøniksen Bo Nyström

Temperature-induced interchain association and contraction of species in aqueous solutions of charged (MHEC(-)-g-PNIPAAM) and uncharged (MHEC-g-PNIPAAM) modified hydroxyethylcellulose-graft-poly(N-isopropylacrylamide) copolymer have been studied with the aid of turbidimetry and dynamic light scattering (DLS). It was shown that by attaching PNIPAAM chains to the backbone of a hydrophilic cellulo...

Journal: :Acta biomaterialia 2012
S M Derkaoui A Labbé P Chevallier S Holvoet C Roques T Avramoglou D Mantovani D Letourneur

Amphiphilic copolymers based on the copolymerization of hydrophilic and hydrophobic moieties offer versatility in various biomedical material applications. Here, a new biocompatible copolymer of dextran-graft-polybutylmethacrylate is synthesized for the coating of metallic endovascular stents. Coating of metallic surfaces is performed and analyzed by X-ray photoelectron spectroscopy, attenuated...

Journal: :The Journal of the Society of Chemical Industry, Japan 1961

Journal: :Macromolecules 2022

The morphological evolution of graft copolymer-based nano-objects was monitored by light scattering and electron microscopy during their formulation in water polymerization induced self-assembly using a photo-mediated reversible addition–fragmentation chain transfer mechanism. copolymer models used were composed dextran backbone bearing poly(2-hydroxypropyl methacrylate) grafts two degrees (X)....

Journal: :Chemical communications 2015
Zhen Zhang Hefeng Zhang Yves Gnanou Nikos Hadjichristidis

A novel strategy, based on the in situ generated boron-thexyl-silaboracyclic initiating sites for the polyhomologation of dimethylsulfoxonium methylide, has been developed for the synthesis of complex polyethylene-based architectures. As examples, the synthesis of a 4-arm polyethylene star, three (polystyrene)(polyethylene)2 3-miktoarm stars and a PE-branched double graft copolymer is given.

2010
adan Mohan Mishra Mithilesh Yadav Dinesh Kumar Mishra Kunj Behari

The synthesis of graft copolymer (partially carboxymethylated guar gum-g-N-vinyl-2-pyrrolidone) is carried out in nitrogen atmosphere using potassium peroxymonosulphate and glycolic acid as redox system. The effect of reaction variables including the concentration of N-vinyl-2-pyrrolidone (8×10−2 −2 −3 −3 −3 −3 vailable online 28 October 2010

Journal: :Langmuir : the ACS journal of surfaces and colloids 2007
Maria Sotiropoulou Frederic Bossard Eric Balnois Julian Oberdisse Georgios Staikos

The formation of soluble hydrogen-bonding interpolymer complexes between poly(acrylic acid) (PAA) and poly(acrylic acid-co-2-acrylamido-2-methyl-1-propane sulfonic acid)-graft-poly(N,N-dimethylacrylamide) (P(AA-co-AMPSA)-g-PDMAM) at pH=2.0 was studied. A viscometric study showed that in semidilute solution a physical gel is formed due to the interconnection of the anionic P(AA-co-AMPSA) backbon...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان آذرباییجان شرقی - دانشکده علوم پایه 1390

سنتز یک هیدروژل ابرجاذب حساس به ph بر پایه ژلاتین، از طریق همبسپارش پیوندی پلی آکریلیک اسید و پلی ایتاکونیک اسید بر روی آن و سپس خنثی سازی همبسپار به دست آمده صورت گرفت. به منظور دست یابی به بیشترین مقدار جذب آب، شرایط واکنشهای همبسپارش پیوندی همبسپار بدست آمده، بهینه شد. بدین ترتیب که ، متغیرهای درگیر در این واکنشها، یعنی غلظتهای تکپار، آغازگر، ژلاتین، عامل شبکه ساز، دمای واکنش ، سرعت همزن مکا...

2010
Hao Feng Jian Li Lijuan Wang

Superabsorbent polymer was prepared by graft polymerization of acrylic acid onto the chain of cellulose from flax shive by using potassium persulfate (KPS) as an initiator and N,N-methylenebisacrylamide (MBA) as a crosslinker under microwave irradiation. SEM photographs were also studied for more information about the shive, cellulose from shive, and the superabsorbent polymer. The structure of...

2016
Vijay Shankar Pandey Mithilesh Yadav

Gellan Gum (GG) was modified with N-vinyl Formamide (NVF) through PDP/Ag + redox system initiated graft copolymerization in a thermostatic water bath at 35°C under nitrogen atmosphere. The highest percentage of grafting (186%) and the lowest homopolymer content (22.2%) were achieved through a systematic optimization of the polymerization variables, including reaction time, temperature, and conc...

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