Investigation of contact surfaces between polymer matrix and metallic glasses in composite materials based on high-density polyethylene

Author

M.Yu.ZadorozhnyyaD.I.ChukovaM.N.ChuryukanovaaM.V.GorshenkovaV.Yu.ZadorozhnyyaA.A.StepashkinaA.A.TsarkovaD.V.Louzguine-LuzginbS.D.Kaloshkina

a

National University of Science and Technology “MISIS”, Leninsky Prosp., 4, 119049 Moscow, Russia

b

WPI-Advanced Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-Ku, Sendai 980-8577, Japan

Received 27 August 2015, Revised 2 December 2015, Accepted 8 December 2015, Available online 10 December 2015.

Highlights

•

Composites based on polymer and metallic glass (Mg67,5Ca5Zn27,5) have been obtained.

•

Range between glass transition and crystallization temperature was used for the composites preparation.

•

Silane improves the interaction between the polymer and the metallic glass particles.

•

Improvement is confirmed by increasing in elastic modulus and thermal conductivity.

Abstract

In our research we obtained composites based on high-density polyethylene (HDPE) reinforced with Mg67,5Ca5Zn27,5 metallic glass by co-extrusion and compression. The co-extrusion and compression procedures have been provided at temperatures of supercooled liquid temperature region of both materials (between the glass transition temperatures (Tg) and crystallization temperature (Tx)). We investigated the mechanical properties and performed the structure characterization of the obtained polymeric/metallic glass composite samples. A positive effect of triethoxyvinylsilane on the adhesion between polymeric matrix and metallic glass reinforced particles was discovered. It was also found that composite samples (HDPE/Mg67,5Ca5Zn27,5) had excellent adhesion, good thermal conductivity and high modules of elasticity. The metallic glassy samples demonstrated good dimensional stability after treatment by the 10 mass% of the triethoxyvinylsilane.

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Improving the bond strength at hybrid-yarn textile thermoplastic composites for high-technology applications by laser radiation

Author

TiloKöckritzaTomSchieferaIreneJansenb1EckhardBeyerab

a

Technische Universität Dresden, Institute of Manufacturing Technology, George-Bähr-Str. 3c 01062, Germany

b

Fraunhofer IWS Dresden, Winterbergstr. 28, 01277 Dresden, Germany

Accepted 16 May 2013, Available online 26 June 2013.

Abstract

This article examines the development of a laser pretreatment method for glass fibre reinforced polypropylene surfaces for industrial applications. This work aims to create a reproducible surface for bonding low-energy polypropylene which adheres very poorly to most adhesives and forms to the matrix material for plastic composites. The combination of glass fibres with polypropylene in the form of hybrid yarns is intended to produce a low-cost and powerful engineered fibre composite with applications in high-technology industries. The key process is bonding the engineered fibre composite without modifying the material properties. This is done by adhesive bonding. For this purpose, various pretreatment processes were examined and compared, for example, surface degreasing, plasma pretreatment for final cleaning and activation, the use of peel ply and laser pretreatment. The laser pretreatment serves two purposes: the defined generation of different surface structures and the exposure of glass fibres to be able to exploit the adhesive properties of glass surfaces. Moreover, two processes of artificial aging were performed to simulate potential boundary conditions during future use thus ensuring well-founded assessment of the pretreatments. Possible maximum initial adhesive strength is not the only key factor in favour of a decision to use adhesive bonding. Rather is the resistance to aging in real ambient conditions relevant for the long-term usage and stable bonding behaviour. Finally, the surface pretreatment methods are compared with each other, assessed and critical issues of surface pretreatment and material are validated.

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Can Geographical Indications Modernize Indonesian and Vietnamese Agriculture? Analyzing the Role of National and Local Governments and Producers’ Strategies

Author
Claire Durand and Stéphane Fournier
World Development, 2017, vol. 98, issue C, 93-104

Abstract: This paper investigates the way Geographical Indications (GIs) are implemented by national and local governments in Indonesia and Vietnam. The two States are active at all stages of GI development, from the selection of the products candidates for GI registration to the supervision of the GI implementation. Thanks to the involvement of national experts from public agencies in the establishment of the Codes of Practices (CoP), they are able to push for the substitution of traditional local techniques with “good practices” (i.e., mostly those recommended by research centers worldwide). Thus, they put GIs at the service of agricultural modernization when GIs apply more conventionally to specific products based on traditional know-how.
Keywords: Geographical Indications; Indonesia; Vietnam; public intervention; agricultural modernization; governance (search for similar items in EconPapers)
Date: 2017
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Institutionalizing Geographical Indications in Southern Countries: Lessons Learned from Basmati and Rooibos

Author
Estelle Biénabe and Delphine Marie-Vivien
World Development, 2017, vol. 98, issue C, 58-67

Abstract: Geographical Indications (GIs) are increasingly conceived as a development tool. However there are insufficient empirical and conceptual grounds to fine tune their institutionalization. This paper investigates the need for and the role of State intervention in GIs using comparative analysis of the trajectories of Basmati rice and Rooibos tea, emblematic products respectively from India and South Africa. The social relevance of GIs depends on the State’s conception and examination of the link to the origin embodied in the GI. Institutionalization should consider GI as a hybrid between a public quality standard and a specific IPR to protect a heritage-based reputation.
Keywords: geographical indications; India; South Africa; Basmati; Rooibos; institutions (search for similar items in EconPapers)
Date: 2017
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Indigenous economic development in Canada: Confronting principal-agent and principal–principal problems to reduce resource rent dissipation

Author
Aidan Vining (vining@sfu.ca) and John Richards
Resources Policy, 2016, vol. 49, issue C, 358-367

Abstract: In Canada, indigenous communities have strengthened de jure and de facto rights over the last generation, thereby enabling them to realize substantial resource rents and other economic development income. Canadian First Nations (the preferred name for most indigenous communities) have in recent years established over 200 economic development corporations, many of them hybrid organizations partnering with non-Aboriginal resource corporations. We analyze the challenges of institutional design of such hybrids, employing the concept of fractionalized ownership. We discuss principal-agent problems at two levels: First Nation members relative to their leaders, and leaders relative to managers of economic development corporations. We also analyze principal-to-principal problems that arise with multiple owners. Using a sample of Ontario First Nation communities, the empirical section analyzes the impact of own-source revenue (much of it derived from resource projects) on a socio-economic index. The main conclusion is that incremental own-source revenue improves community socio-economic conditions, but only modestly.
Keywords: First Nations; Economic development corporations; Resource rents; Principal-agent problems; Principal–principal problems; Rent dissipation (search for similar items in EconPapers)
Date: 2016
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Orders of Acanthaceae, Myoporaceae, Phrymaceae, and Plantaginaceae

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Description

Pictured are flowers of the orders acanthaceae, myoporaceae, phrymaceae, and plantaginaceae. The flowers illustrated are (1) ruellia, (2) justicia, (3) myoporum, (4) phryma, and (5) plantago.

Keywords

acanthaceae, flower, flower diagram, flower parts, justicia, myoporaceae, myoporum, order, phryma, phrymaceae, Plantaginaceae, Plantago, ruellia

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Galleries

Flower Anatomy, Flowers and Shrubs: A

Source:

L. H. Bailey Standard Cyclopedia of Horticulture (New York, New York: The MacMillan Company, 1917) volume 1, page 73