| 1. |
- Butylina, Svetlana, et al.
(författare)
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Physical and mechanical properties of wood-polypropylene composites made with virgin and/or recycled polypropylene
- 2011
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Ingår i: Polymer-plastics technology and engineering (Softcover ed.). - : Taylor & Francis. - 0360-2559 .- 1525-6111. ; 50:10, s. 1040-1046
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Tidskriftsartikel (refereegranskat)abstract
- The physical and mechanical properties of wood-polymer composites made with virgin or recycled polypropylene, or a mixture of these were studied. The composites made with recycled polypropylene had higher density, lower porosity, and higher dimensional stability compared to the composites made with virgin polypropylene. Although the composites made with recycled polypropylene exhibited lower tensile strength than those made with virgin polypropylene, they had higher Charpy impact strength. Scanning electron microscopy analysis of the fractured surfaces of the composites showed no significant differences in the fracture mechanisms of the studied composites. The degree of crystallinity was estimated to be higher for the virgin polypropylene than for the recycled one.
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| 2. |
- Kaptan, Navid, et al.
(författare)
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Thermal Behavior and Degradation Kinetics of Compatibilized Metallocene-Linear Low Density Polyethylene/Nanoclay Nanocomposites
- 2014
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Ingår i: Polymer-plastics technology and engineering (Softcover ed.). - : Informa UK Limited. - 0360-2559 .- 1525-6111. ; 53:9, s. 890-902
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Tidskriftsartikel (refereegranskat)abstract
- Morphology, thermal degradation and kinetics of metallocene-linear-low-density polyethylene (m-LLDPE)/m-LLDPE-graft-maleic anhydride (m-LLDPE-g-MA)/nanoclay nanocomposites were compared with m-LLDPE/nanoclay, m-LLDPE-g-MA/nanoclay and m-LLDPE/m-LLDPE-g-MA systems. X-ray diffraction measurements revealed intercalated and "highly intercalated'' morphologies for the nanocomposites. Thermogravimetric analysis demonstrated that although thermal degradation of m-LLDPE systems were delayed upon the inclusion of nanoclay in air, an inverse effect was perceived for the nanoclay under inert atmosphere. This conclusion was supported by kinetic analysis in terms of reaction order and activation energy. The results obtained from kinetics models also put forward the contribution of m-LLDPE-g-MA, as a compatibilizer, to the thermal stability enhancement through intermolecular cross-linking augmentation.
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| 3. |
- Kelly, Catherine, et al.
(författare)
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Production of Biodegradable Foams Using Supercritical CO2
- 2014
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Ingår i: Polymer-plastics technology and engineering (Softcover ed.). - : Informa UK Limited. - 0360-2559 .- 1525-6111. ; 53:11, s. 1169-1177
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Tidskriftsartikel (refereegranskat)abstract
- A single screw extrusion process in which CO2 is injected into the polymer melt has been utilized to produce low density biodegradable poly(DL-lactic acid) (PDLLA) foams. High pressure differential scanning calorimetry (DSC) and rheology are used to observe the melting point and viscosity depression of PDLLA 3051D in the presence of CO2. Foams of PDLLA 3051D are produced in a static environment under a range of conditions, and these data are utilized to extrude PDLLA 3051D into foamed sheets for packaging applications. The density, crystallinity, mechanical properties and microstructure of these foams are evaluated.
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| 4. |
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