On the possibility of replacement of calcium carbonate by a high-performance, economically viable filler in polyethylene composites

2021 ◽  
pp. 089270572110319
Author(s):  
Mohammadnabi Hesabi ◽  
Shane Brennan ◽  
Quentin Boulard ◽  
Francois Le Blanc ◽  
Ian Major
Keyword(s):  
Calcium Carbonate ◽  
Yield Stress ◽  
High Performance ◽  
Filler Loading ◽  
Influential Factor ◽  
Promising Alternative ◽  
Wide Composition Range ◽  
Processing Cost ◽  
Lower Viscosity ◽  
Twin Screw

Calcium carbonate (CaCO3) is frequently added to polyethylene (PE) as a filler to reduce costs. An alternative to CaCO3, calcium fluoride (CaF2) was proposed in this research. PE/CaCO3 and PE/CaF2 composites in a wide composition range (0–60 wt.%) were prepared through a parallel twin screw extruder. Results indicated better interaction of CaF2 with PE matrix which improved samples yield stress. Statistical analysis showed the filler type was more influential factor on the yield stress while filler loading was not a statistically significant one. In contrast, crystallinity was strongly depended on the filler loading. The dynamic mechanical and rheological investigations revealed that PE/CaF2 composites had higher stiffness at ambient temperature and possessed lower viscosity below 40 wt.% of filler loading compared to PE/CaCO3 which could reduce the processing cost. Therefore, regarding its low price and good functional properties, CaF2 can be a promising alternative to CaCO3.

scholarly journals A simulation-based approach to evaluate objective material parameters from concrete rheometer measurements

2019 ◽  
Vol 29 (1) ◽  
pp. 130-140 ◽  
Author(s):  
Florian Gerland ◽  
Alexander Wetzel ◽  
Thomas Schomberg ◽  
Olaf Wünsch ◽  
Bernhard Middendorf
Keyword(s):  
Yield Stress ◽  
High Performance ◽  
Evaluation Method ◽  
High Performance Concrete ◽  
Direct Determination ◽  
Plastic Viscosity ◽  
Flow Properties ◽  
Fresh Sample ◽  
Material Parameters ◽  
Simulation Based

Abstract Modern concretes such as ultra-high performance concrete (UHPC) show excellent strength properties combined with favorable flow properties. However, the flow properties depend strongly on process parameters during production (temperature, humidity etc.), but also change sensitively even with slight variations in the mixture. In order to ensure desired processing of the fluidlike material and consistent process quality, the flow properties of the concrete must be evaluated quantitatively and objectively. The usual evaluation of measurements from concrete rheometers, for example of the ball probe system type, does not allow the direct determination of the objective material parameters yield stress and plastic viscosity of the sample. We developed a simulation-based method for the evaluation of rheometric measurements of fine grained high performance concretes like self-compacting concrete (SCC) and UHPC. The method is based on a dimensional analysis for ball measuring systems. Through numerical parameter studies we were able to describe the identified relationship between measuring quantities and material parameters quantitatively for two devices of this type. The evaluation method is based on the Bingham model. With this method it is possible to measure both the yield stress and the plastic viscosity of the fresh sample simultaneously. Device independence of the evaluation process is proven and an application to fiber-reinforced UHPC is presented.

scholarly journals Efficient resolution of racemic crown-shaped cyclotriveratrylene derivatives and isolation and characterization of the intermediate saddle isomer

2019 ◽  
Vol 15 ◽  
pp. 1339-1346
Author(s):  
Sven Götz ◽  
Andreas Schneider ◽  
Arne Lützen
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Nmr Spectroscopy ◽  
High Performance ◽  
Chiral Stationary Phase ◽  
Hplc Separation ◽  
Promising Alternative ◽  
Isolation And Characterization ◽  
C Nmr

The preparative resolution of a trifunctionalized C 3-symmetrical chiral cyclotriveratrylene derivative was achieved via high-performance liquid chromatography (HPLC) on a chiral stationary phase. This approach is a promising alternative to the previously reported resolution through formation of diastereomeric esters because it involves fewer synthetic steps and is less prone to thermal (re)racemization. During these studies an intermediate saddle conformer could also be isolated and characterized by 1H and 13C NMR spectroscopy. The HPLC separation method was further developed in order to allow investigations on the racemization behavior of the cyclotriveratrylene derivative.

High performance metallic multilayer thin films on modified polypropylene with calcium carbonate fillers

1991 ◽  
Vol 48 (2) ◽  
pp. 155-161
Author(s):  
Y.S. Chang ◽  
S.M. Ma ◽  
C.Y. Lin ◽  
J.F. Chang ◽  
C.H. Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Calcium Carbonate ◽  
High Performance ◽  
Multilayer Thin Films

Preparation of Plate-Shaped Calcium Carbonate and its Application in the Coating Paper

2011 ◽  
Vol 236-238 ◽  
pp. 1124-1127
Author(s):  
Sen Wang ◽  
Xin Ping Li ◽  
Er Lin Mao ◽  
Zhuo Yuan Cheng
Keyword(s):  
Carbon Dioxide ◽  
Calcium Carbonate ◽  
Calcium Oxide ◽  
High Performance ◽  
Air Permeability ◽  
Paper Coating ◽  
Reaction Conditions ◽  
Printing Ink

This paper deals with the preparation of Plate-shaped Calcium Carbonate and Its Application in the Paper Coating. calcium oxide and carbon dioxide were used as major materials to preparetion the Plate-shaped Calcium Carbonate, The best reaction conditions as follows: w(CaO)：w（H2O）=1：5, V（CO2）：V（atmosphere）=1：2. Then use the Plate-shaped Calcium Carbonate in spreading. The results show that the Plate-shaped Calcium Carbonate is a high-performance product that can obviously enhance the paper’s smoothness, whiteness, air permeability, printing ink absorbance.

scholarly journals Synthesis and properties of a high-performance environment-friendly micro–nano filtration reducer

RSC Advances ◽  
2020 ◽  
Vol 10 (70) ◽  
pp. 43204-43212
Author(s):  
Yanling Wang ◽  
Baoyang Jiang ◽  
Jincheng Lan ◽  
Ning Xu ◽  
Jinsheng Sun ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Graft Copolymer ◽  
High Performance ◽  
Research Study ◽  
Hydroxyethyl Cellulose ◽  
Environment Friendly ◽  
Hydrophobically Associating ◽  
Nano Filtration

In this research study, we modified hydroxyethyl cellulose to obtain hydrophobically associating hydroxyethyl cellulose, and grafted it onto the surface of nano-calcium carbonate to obtain a graft copolymer.

scholarly journals Growth Performance of Local Chicken Breeds, a High-Performance Genotype and Their Crosses Fed with Regional Faba Beans to Replace Soy

Animals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 702 ◽  
Author(s):  
Tanja Nolte ◽  
Simon Jansen ◽  
Steffen Weigend ◽  
Daniel Moerlein ◽  
Ingrid Halle ◽  
...  
Keyword(s):  
High Performance ◽  
Live Weight ◽  
Daily Weight Gain ◽  
Animal Nutrition ◽  
Carcass Quality ◽  
Native Protein ◽  
Promising Alternative ◽  
Vicia Faba L ◽  
Faba Beans ◽  
Chicken Breeds

The faba bean (Vicia faba L.) is a native protein crop and considered a promising alternative to soybeans. Due to its anti-nutritive substances such as vicin and convicin (VC) its use in animal nutrition has been restricted. In the present study, two consecutive experiments were conducted to analyse the effects of feeding 20% faba beans, which differ in their VC content on fattening performance and slaughter traits of different chicken genotypes. In a first trial, purebred male chickens of the local breeds Bresse Gauloise and Vorwerkhuhn as well as of a high-performance White Rock line were tested. In a second trial, crossbreds of them were evaluated: Vorwerkhuhn x Bresse Gauloise, Vorwerkhuhn x White Rock, Bresse Gauloise x White Rock. Daily weight gain and feed intake were recorded until slaughter at approximately 2100 g. At slaughter the final live weight, carcass yield and the weights of the valuable parts (breasts and legs) were measured. For the genotypes studied, no adverse or undesirable effects of both VC−rich and VC−poor faba beans in the feedstuff were detected regarding body weight development, carcass quality, and fattening parameters. Furthermore, there was no indication that the birds’ health was impaired.

Effect of Nano-Calcium Carbonate on the Mechanical Properties of Polypropylene

2014 ◽  
Vol 665 ◽  
pp. 343-347
Author(s):  
Chun Feng Sun ◽  
Ming Gao
Keyword(s):  
Mechanical Properties ◽  
Calcium Carbonate ◽  
Injection Molding ◽  
Standard Sample ◽  
Polymer Physics ◽  
Molding Machine ◽  
Injection Molding Machine ◽  
Twin Screw ◽  
Physics Experiment

The task of the polymer physics experiment course is using a certain percentage of nanocalcium carbonate (CaCO3) to composite polypropylene (PP) and using a twin-screw injection molding machine to inject the compound above into a standard sample. After that some mechanical properties test were made to get some nanocalcium carbonate data which may affect the mechanical properties of polypropylene.

Applications of Elastomers in Solid Rocket Powerplants

1966 ◽  
Vol 39 (1) ◽  
pp. 112-125 ◽  
Author(s):  
D. C. Sayles
Keyword(s):  
Composite Materials ◽  
High Performance ◽  
Filler Loading ◽  
Combustion Flame ◽  
Solid Rocket ◽  
Reinforcing Filler

Abstract Application of elastomers in the manufacture of solid-propelled powerplants is discussed. Thermal, ablative, and erosion-resistant properties of elastomeric composite materials are influenced by the composition of the elastomeric binder, the shape and composition of the reinforcing filler, filler loading, and the filler-to-elastomer ratio. The development of high performance motors, operating at higher chamber pressures, higher combustion flame temperatures, and for longer burning durations clearly point to the need for further advances in the insulative motor components for the liner, motor case, slivers, and nozzle if the requirements for improved future rocket designs are to be met.

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