Wyniki wyszukiwania - BazTech

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Cobalt nanoparticles processed by thermal decomposition of metal containing monomer

Sówka E., Leonowicz M., Andrzejewski B., Pomogailo A.D., Dzhardimalieva G.I.

Materials Science Poland

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2006

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Vol. 24, No. 2/1

311--317

EN

Polymer matrix ferromagnetic nanocomposites, containing Co nanocrystallites, were processed by an innovative fabrication method using frontal polymerisation of cobalt acrylamid (AAm) complex, followed by subsequent thermolysis at temperatures 873 and 1073 K. The thermolysis products were in the form of irregular powder particles having broad range of size distribution, from 10 up to 300 žm. The powder particles contained nanocrystallites of Co having mean size in the range 12-15 nm, depending on the thermolysis temperature. The hysteresis loops recorded for materials processed at 873 and 1073 K, respectively proved that the coercivity depends on the processing temperature and very slightly on the measurement temperature. The thermolysis product, processed at 873 K, showed soft magnetic properties. The particles were randomly distributed and their size and agglomeration can be controlled by the processing variables.

2

The major properties of metallopolymer nanocomposites

Pomogailo A.D.

Inżynieria Materiałowa

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2004

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R. XXV, nr 3

302-307

EN

Materials engineering of nanostructured, electrical, optical and semiconducting properties of metallopolymer nanocomposites are being analyzed analysed. The unsolved problems in these field are being accented and the ways for optimization of the properties of metallopolymer nanocomposites are being discussed.

3

Polymer nanocomposites on the base of metal carboxylates

Pomogailo A. D., Rozenberg A. S., Dzhardimalieva G. I.

Advances in Materials Science

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2001

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Vol. 1, nr 1(1)

19-27

EN

The thermal transformation of unsaturated metal carboxylates (metal acrylates and maleates) are the complex process including dehydration, solid phase polymeriza-tion, and decarboxylation of metalcarboxylate groups of the polymer formed which proceed sequentially at varied temperature ranges. The thermolysis resulted in the synthesis of metal nanoparticles with narrow size distribution (the mean particle diameter of 5-10 nm) in the polymer matrix formed in situ.

4

Polyolefin-based polymer-polymer compositions formed in situ. The polyethylene-poly(vinyl chloride) system

Pomogailo A. D.

Polimery

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1998

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T. 43, nr 3

161-166

EN

Methods of preparing polymer-polymer compositions in situ are reviewed. Polyolefin is one of the ingredients of such compositions. The structure of composite materials based on PE/PVC is discussed. The proper-ties of polymer blends and compositions formed in situ are compared. The important role played by the interlayer formed in these polymer compositions in situ is discussed; their structure and compositions are shown to determine the basic properties of the material. The compositions obtained by mixing followed by polymerization include an interlayer of an interpenetrating net-work. The structure of compositions formed in situ is responsible for their unconventional properties and applications.

PL

Omówiono metody preparowania in situ kompozycji polimer/polimer na przykładzie układu PE-LD/PVC. Etylen polimeryzowano wobec układu PYC/VCl4/AlEt2O (ciśnienie 0,5 MPa), otrzymując PE-LD. Kompozycje PE-LD/PVC uzy-skiwano przez zmielenie składników (20 min). Porównano składy i właściwości kompozycji (zwłaszcza mechaniczne, badane w maszynie Instron, tabela 2). Stwierdzono, że struktura międzyfazowej warstwy wzajemnie przenikających się sieci wpływa decydująco na strukturę kompozycji, która z kolei określa jej szczególne właściwości i umożliwia specyficzne za-stosowania; kompozyqe PE-LD/PVC można zgrzewać prądem wysokiej częstotliwości