C. Lavallee's research while affiliated with Polytechnique Montréal and other places
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Publications (6)
The potential of melt processing polymer blends to prepare damping materials was investigated. Binary and ternary blends of polyvinylchloride (PVC) with thermoplastic polyurethane elastomers (TPU) were studied. The soft segments of the polyurethanes for the first series were of the ether type and of the ester type for the second series of blends. A...
The morphology of the dispersed phase in immiscible polymer blends plays an important role in the determination of the final physical properties. This paper considers factors that influence the final state of deformation of the dispersed phase, and in particular, the formation of fibers and lamellae. Blends of polyethylene and nylon-6 were extruded...
In order to understand the influence of interfacial modification in polyamide/ionomer/ polypropylene ternary blends, the binary blends were investigated. In this study two multiphase blends have been chosen, PP/ionomer and PA/ionomer, where the ionomer was a copolymer of polyethylene and of a mixture of methacrylic acid, zinc methacrylate and isobu...
Most processing/morphology studies of multi-phase polymer blends have been concerned with controlling the size and shape of the dispersed phase. The dispersed phase is generally a pure homo- or copolymer (apart from low levels of interfacial modifier). This paper describes the preparation during melt processing of a complex polymer blend morphology...
The objective of this work is to prepare a composite droplet morphology through melt processing. We would like to concentrate more specifically on the control of the size of the sub-inclusions and on their retention after phase inversion. A high retention could allow an increase in effective volume of the dispersed phase. The importance of blending...
Citations
... Çok fazlı malzemelerin özellikleri, bileşimdeki polimerlerin özellikleri, fazlar arasındaki yapışma ve eriyik karıştırma işlemi sırasında oluşturulan karışımın morfolojisi ile belirlenir. Karışım morfolojisi, karışımdaki bileşenlerin reolojik özelliklerine, arayüzey gerilimlerine, bileşim miktarlarına ve işleme koşullarına bağlı olarak değişir [25,26]. Polimer karışımları genellikle, matriste dağılmış parçacıklı yapıya sahiptir. ...
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... Polyester-based thermoplastic polyurethane (TPU) is commonly blended with plasticized PVC resulting in a PVC blend with improved abrasion and fatigue resistance [1] [4] [5]. However, as with most PVC/thermoplastic blends, they are difficult to process on conventional PVC processing equipment because of their high melt viscosity and limited heat stability [6]. The addition of TPU plasticizers to PVC to form a polymer blend can be accomplished in several ways [7]. ...
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... They obtained a very fine morphology and excellent impact strength when the blends were prepared by two-step mixing. Willis et al. [17], working with PA-polyolefin blends, showed that an ionomer (Surlyn 9020, used as compatibilizer) has more affinity for the PA phase. The migration of modifier to the interface is facilitated when it is initially mixed with the component for which it has the least affinity. ...
... The formation of sub-inclusions via phase inversion in highly viscous systems has been reported in binary melt-processed polymer blends of polypropylene/polycarbonate and polyethylene copolymer/polyamide by Favis et al. [51][52][53]. They found that increasing the viscosity of the dispersed phase (polypropylene) caused an increase in the concentration of sub-inclusion droplets because of the lower sub-inclusion droplets mobility -also resulting in a higher retention of sub-inclusions in the dispersed phase. ...
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