Study: Service life for PE, PP sewer pipes at least 100 years
ABSTRACT: "Operators of sewer systems using non-pressure polyethylene and polypropylene pipes can expect the polyolefin products to have a service life of at least 100 years, according to a technical report published by the European Plastic Pipes and Fittings Association (TEPPFA)." Dec 2015.
Extrusion is the key to Sonoco's TruVue plastic can
ABSTRACT: "TruVue, the company has now revealed, utilizes a five-layer wall that includes polypropylene on both the inside and outside of the can. Two layers of adhesive bond that PP to a center EVOH layer that acts as an oxygen barrier." Feb 2016.
TPG adds water-safe Polifil PP compounds
ABSTRACT: "The Plastics Group of America - a materials firm based in Woonsocket, R.I. - has added water-safe polypropylene compounds to its lineup... The new materials - sold under TPG's Polifil trade name - are based on homopolymer PP and are reinforced with chemically-coupled glass fibers. They also have NSF/ANSI certifications from NSF International and the American National Standards Institute." Oct 2015.
Asahi Kasei shows new PP compounds
ABSTRACT: "New polypropylene compounds were in the spotlight for Asahi Kasei Plastics North America Inc. at NPE 2015. The Fowlerville, Mich.-based firm showed new grades of its Thermylene-brand PP compounds in high-strength and bimodal long-fiber versions, as well as grades using 3M microsphere technology." Apr 2015
Reprocessability of high impact polystyrene/clay nanocomposites in extrusion
ABSTRACT: "In this study, high impact polystyrene (HIPS) and its nanocomposites with 3 and 5 wt% of Cloisite 20A were processed within four extrusion cycles in a single screw extruder having Maddock mixing section. Changes in nanostructure, in thermal, flow and mechanical properties, and in morphology of neat HIPS and its nanocomposites with reprocessing cycles were investigated. X-Ray diffractograms showed that the basal interplanar distance of clay layers increased at the first extrusion cycle, indicating the formation of nanocomposites with intercalated structure, but remained almost constant along extrusion cycles. " Mar 2016
Researchers in Finland develop biobased polystyrene
ABSTRACT: "While it is used all over the world as a light packaging and insulation material, EPS (expanded polystyrene) is a problem as waste. This is why VTT Technical Research Centre of Finland is currently developing an affordable and environmentally friendly alternative for polystyrene from PLA bioplastic, which is derived from organic sources." Dec 2014
Microbial degradation of high impact polystyrene (HIPS), an e-plastic with decabromodiphenyl oxide and antimony trioxide
ABSTRACT: "Accumulation of electronic waste has increased catastrophically and out of that various plastic resins constitute one of the leading thrown out materials in the electronic machinery. Enrichment medium, containing high impact polystyrene (HIPS) with decabromodiphenyl oxide and antimony trioxide as sole carbon source, was used to isolate microbial cultures. The viability of these cultures in the e-plastic containing mineral medium was further confirmed by triphenyl tetrazolium chloride (TTC) reduction test. Four cultures were identified by 16S rRNA sequencing as Enterobacter sp., Citrobacter sedlakii, Alcaligenes sp. and Brevundimonas diminuta. Biodegradation experiments were carried out in flask level and gelatin supplementation (0.1% w/v) along with HIPS had increased the degradation rate to a maximum of 12.4% (w/w) within 30 days. This is the first report for this kind of material. The comparison of FTIR, NMR, and TGA analysis of original and degraded e-plastic films revealed structural changes under microbial treatment. Polystyrene degradation intermediates in the culture supernatant were also detected using HPLC analysis. The gravity of biodegradation was validated by morphological changes under scanning electron microscope. All isolates displayed depolymerase activity to substantiate enzymatic degradation of e-plastic." Jun 2016
Hard transparent coatings on thermoplastic polycarbonate
ABSTRACT: "...polycarbonates feature limited scratch and mar resistance, being characterized by very low surface hardness. This suggests the protection of polycarbonates with hard transparent coatings. However, poor interfacial adhesion between conventional coatings and polycarbonates, reduced cohesive strength of some hard coating materials and, in particular, their limited compliance when deposited on ductile substrates often reduce significantly their performance. In this respect, the present work analyzes the pros and cons of protecting thermoplastic polycarbonates with specialty coatings, emphasizing the real advantages of applying surface overlying layers and their drawbacks." Oct 2015