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Recycling of Automotive Plastics
Published in Rose A. Ryntz, Philip V. Yaneff, Coatings Of Polymers And Plastics, 2003
Reactive Diluents. Another consideration in formulating flexible, low-VOC coatings, involves the choice of reactive diluent, a low-viscosity co-reac-tant designed to lower the VOC of the coating system. While they reduce the viscosity of the polymeric constituents (similar to solvents), they also undergo reaction with the crosslinker utilized in the system. The ideal reactive diluent should possess the following traits: (1) low intrinsic viscosity, (2) good solubility/solvency, (3) relatively high equivalent weight, (4) reasonable pot life (in 2K formulations)/good cure response, and (5) good film performance/weathering.
Experimental characterization of the hygrothermal ageing effects on the bulk mechanical properties and lap-shear strength of the novel bio-based epichlorohydrin/cardanol adhesive
Published in The Journal of Adhesion, 2022
Vasileios Tzatzadakis, Konstantinos Tserpes
The epoxy resin is composed of epichlorohydrin based on glycerol, which has an environmental product declaration (EPD) for reducing carbon emissions. The hardener and the reactive diluent are based on cardanol. Cardanol is a phenolic lipid obtained from anacardic acid, the main component of cashew nutshell liquid (CNSL), a byproduct of cashew nut processing derived from natural and renewable feedstock. The components of anacardic acid are 2-hydroxy-6-alkyl benzoic acids with a number of saturated and unsaturated C8 chains. The hardener is a phenalkamine curing agent with no benzyl alcohol compounds, which provides excellent adhesive properties to the resin matrix due to the cashew liquid chemical structure. Also, it grants rapid cure even at low temperatures. The reactive diluent provides the resin system flexibility while it is solvent-free.
Synthesis and characterization of high bio-based content unsaturated polyester resin for wood coating from itaconic acid: Effect of various reactive diluents as an alternative to styrene
Published in Journal of Dispersion Science and Technology, 2019
Linchon B. Mehta, Kunal K. Wadgaonkar, Ramanand N. Jagtap
The viscosity of resin is one of the most important flow parameters to determine the end application of any thermosetting resin. The lower viscosity of resin will undoubtedly play a positive role in improving its applicability on substrate while higher viscosity will affect the overall performance of the final coatings. The chain structure and molecular structure of a polymer determine its rheological properties. Figure 7 shows the viscosity of UPs with respect to shear rate. It can be observed that UP1 and UP2 show very low viscosities due to the formation of very low molecular weight oligomers as discussed above while UP3 shows very high viscosity which is not desirable for any coating application. However, the viscosity obtained in case of UP4 is in the range which is desirable for this study; hence UP4 was diluted with the above mentioned reactive diluents. In curing process, the addition of reactive diluent is necessary to improve the flowability.
Photo-crosslinked synthetic biodegradable polymer networks for biomedical applications
Published in Journal of Biomaterials Science, Polymer Edition, 2019
Bas van Bochove, Dirk W. Grijpma
A photo-crosslinkable system for SLA based on divinyl-fumarate poly(ε-caprolactone) was used to prepare tissue engineering scaffolds [175]. Initially, resin were prepared with either a non-reactive solvent (N-methyl-2-pyrrolidone, NMP) or with NVP as a reactive diluent. As the best crosslinking was achieved with the reactive diluent under UV light the tissue engineering scaffolds were prepared using that resin. The obtained scaffolds closely resembled the designs.