Development and characterisation of injection moulded, all-polypropylene composites

In this work, all-polypropylene composites (all-PP composites) were manufactured by injection moulding. Prior to injection moulding, pre-impregnated pellets were prepared by a three-step process (filament winding, compression moulding and pelletizing). A highly oriented polypropylene multifilament was used as the reinforcement material, and a random polypropylene copolymer (with ethylene) was used as the matrix material. Plaque specimens were injection moulded from the pellets with either a film gate or a fan gate. The compression moulded sheets and injection moulding plaques were characterised by shrinkage tests, static tensile tests, dynamic mechanical analysis and falling weight impact tests; the fibre distribution and fibre/matrix adhesion were analysed with light microscopy and scanning electron microscopy. The results showed that with increasing fibre content, both the yield stress and the perforation energy significantly increased. Of the two types of gates used, the fan gate caused the mechanical properties of the plaque specimens to become more homogeneous (i.e., the differences in behaviour parallel and perpendicular to the flow direction became negligible)

Energy justice intermediaries: Living Labs in the low-carbon transformation

This paper foregrounds the use of “Living Labs” as instruments for the delivery of just low carbon transformations. Living Labs are commonly understood as stakeholder-centred, iterative and open-innovation ecosystems that involve multiple forms of co-creation and engagement among different actors in a given territory. Over a period of three years, thanks to a unique pan-European action research study, three such Labs were set up in different locations in Europe – a large North-western European city (Manchester, England), a mid-sized mountainous town in South-eastern Europe (Metsovo, Greece) and a series of rural settlements in Central Europe (Nyírbátor, Hungary). Working closely with local residents and relevant organisational stakeholders, the research teams that led the Labs undertook multiple low-carbon interventions in the homes of low-income residents, while continuously monitoring the broader impacts of intermediation practices on energy equity and sustainability across three consecutive cycles of activity. We present and discuss the results of these activities, so as to uncover the impacts of Living Labs on energy poverty both before and during the Covid-19 pandemic