The Application of Calcium Sulfate Whisker in Styrene-Acrylic Emulsions

2010 ◽  
Vol 152-153 ◽  
pp. 821-824
Author(s):  
Hong Bo Liu ◽  
Ji Hu Wang ◽  
Shao Guo Wen ◽  
Chen Yu
Keyword(s):  
Mechanical Properties ◽  
Calcium Sulfate ◽  
Physical And Mechanical Properties ◽  
Contact Angles ◽  
Coating Films ◽  
Pencil Hardness ◽  
Calcium Sulfate Whiskers ◽  
Titanium Dioxides ◽  
Calcium Sulfate Whisker ◽  
Dispersing Agents

The styrene-acrylic emulsions were prepared by copolymerization of styrene, acrylic acid and n-butyl acrylate; coatings were achieved by adding calcium sulfate whiskers and titanium dioxides at the presence of dispersing agents and rheological additives. The physical and mechanical properties as well as contact angles of coating films formed on tinplate were characterized in detail. The pencil hardness was slightly decreased; the contact angle was greatly decreased from 69.8o to 12oby adding the calcium sulfate to indicate the hydrophilic coating films may have self-cleaning properties.

Effect of Different Kinds of CaSO4 Whisker on the Bending Strength and Hygroscopicity of Gypsum Board

2014 ◽  
Vol 638-640 ◽  
pp. 1322-1325 ◽  
Author(s):  
Chang Chen ◽  
Yu Bin Wang ◽  
Hua Wang ◽  
Qian Qian Deng ◽  
Lei Du ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Calcium Sulfate ◽  
Bending Strength ◽  
Gypsum Board ◽  
Specific Strength ◽  
Different Types ◽  
Calcination Method ◽  
Calcium Sulfate Whiskers ◽  
Calcium Sulfate Whisker ◽  
Properties Of Composites

Different kinds of hemihydrate calcium sulfate whiskers were fabricated by calcination method under the condition of 115-600 °C. And the density, moisture rate and mechanical properties of composites of gypsum and whisker were studied. The specific strength of composites was investigated. The results show that gypsum boards with whisker calcined at 115 °C and 300 °C have the maximum and minimum densities, which are about 1658 kg/m3 and 1604 kg/m3, respectively. Hydration ability of anhydrous calcium sulfate whisker is the strongest. The values of specific strength of gypsum board reinforced by different types of whiskers suggested that the porosity of the composites changed with the different kinds of whiskers, which agreed well with the moisture rate and mechanical properties.

scholarly journals Effects of Calcium Sulfate Whiskers on the Mechanical Properties and Light Transmittance of PE Greenhouse Films

2022 ◽  
Vol 2160 (1) ◽  
pp. 012004
Author(s):  
Runmeng Qiao ◽  
Zhengping Zhong ◽  
Qiao Liu ◽  
Jialei Liu ◽  
Wenqing He
Keyword(s):  
Mechanical Properties ◽  
Calcium Sulfate ◽  
Light Transmittance ◽  
Major Goal ◽  
Tear Strength ◽  
Calcium Sulfate Whiskers ◽  
New Formula ◽  
High Orientation ◽  
Calcium Sulfate Whisker ◽  
Orientation Structure

Abstract Calcium sulfate whisker (CSW) is a kind of fiber crystal material with high orientation structure. The major goal of this research is to study the changes of mechanical properties and light transmittance of PE greenhouse film with different proportions of CSW. The experimental results show that the mechanical properties and light transmittance of PE/CSW films are enhanced compared with the pure PE. For PE/2%CSW, it shows a 18.6% increase in tear strength, a 3.1% increase in luminous transmittance and 17.7% increase in haze. The PE/5%CSW demonstrates a 12.8% higher in tensile strength, a 20.5% higher in tear strength, a 23.9% lower in luminous transmittance and a 53.0% higher in haze. This article gives a new formula to strengthen the mechanical properties of PE greenhouse films and finds the direction for the research and development of astigmatic covering film.

scholarly journals Efficient activation of persulfate by calcium sulfate whisker supported nanoscale zero-valent iron for methyl orange removal

RSC Advances ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 452-461
Author(s):  
Yi Han ◽  
Xian Zhou ◽  
Li Lei ◽  
Huiqun Sun ◽  
Zhiyuan Niu ◽  
...  
Keyword(s):  
Composite Material ◽  
Methyl Orange ◽  
Calcium Sulfate ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron ◽  
Calcium Sulfate Whiskers ◽  
Calcium Sulfate Whisker

In order to improve the utilization of nanoscale zero-valent iron (nZVI) in activating persulfate (PS), a composite material of nZVI/CSW with nZVI supported on calcium sulfate whiskers (CSWs) was synthesized in this study.

Physical and Mechanical Properties of Inorganic Particles Filled Individual Bamboo Fibers

2012 ◽  
Vol 476-478 ◽  
pp. 1930-1933 ◽  
Author(s):  
Jie Gao ◽  
Ge Wang ◽  
Hai Tao Cheng ◽  
Sheldon Q. Shi
Keyword(s):  
Mechanical Properties ◽  
Calcium Carbonate ◽  
Tensile Properties ◽  
Physical And Mechanical Properties ◽  
Contact Angles ◽  
Angle Measurement ◽  
Inorganic Nanoparticles ◽  
Submicron Particles ◽  
Inorganic Particles ◽  
Bamboo Fibers

The objectives of the current study involve in situ depositing treatments of calcium carbonate particles onto bamboo fibers through the ionic reaction of sodium carbonate and calcium chloride aqueous solution at varied bath temperatures, and their impacts on surface features, wettability and tensile properties of single bamboo fibers. Field emission scanning electron microscopy was employed to characterize surface morphology of fibers. The wettability of bamboo fibers was evaluated by optical contact angle measurement instrument. The results show that nanoparticles and submicron particles grew into the wrinkles and micropores of fibers, the size, morphology and adsorbance of which were distinctively varied at different bath temperatures. The highest calcium carbonate adsorbance (2.34%) was obtained at 25°C. Besides, the mean values of contact angles increased and the variations within group were reduced as the loading percentage of particles rose, which might be due to reduced hydrophilic groups after coatings of calcium carbonate particles. The treatments were approved to enhance tensile properties of single bamboo fibers, comparing to the average tensile strengh and modulus of elasticity of the untreated, those of the treated bamboo fibers with the biggest calcium carbonate loading were higher by 30.50% and 32.71% respectively. It’s proved that the precipitating treatment is a useful method to densify and hydrophobize bamboo fibers and smooth out cell wall defects. What’s more, it provide explanations for improvements of physical and mechanical properties of paper and fiber reinforced plastic composites filled with inorganic nanoparticles.

scholarly journals A New Composite Restorative Based on a Hydrophobic Matrix

1979 ◽  
Vol 58 (10) ◽  
pp. 1981-1986 ◽  
Author(s):  
W.H. Douglas ◽  
R.G. Craig ◽  
C.J. Chen
Keyword(s):  
Mechanical Properties ◽  
Blue Light ◽  
Water Sorption ◽  
Physical And Mechanical Properties ◽  
Hydrophobic Surface ◽  
Contact Angles ◽  
Alkyl Methacrylate ◽  
Oral Fluids ◽  
Hydrophobic Matrix ◽  
Highly Hydrophobic

A hydrophobic restorative composite based on a fluorocarbon analog of an alkyl methacrylate and a bisphenol adduct was formulated into a one-paste system, which polymerized in the presence of blue light. Physical, mechanical, and water-related properties were determined. High contact angles and low water sorption were shown by the experimental composite. Capillary penetration of oral fluids around restorations, therefore, could be prevented in the presence of this highly hydrophobic surface. The physical and mechanical properties of the experimental composite were either comparable to or somewhat less favorable than commercial Bis-GMA composites.

Study on Preparation of Calcium Sulfate Whisker with Leaching Tailings of Nickel Ore

2011 ◽  
Vol 287-290 ◽  
pp. 2084-2087 ◽  
Author(s):  
Li Wang ◽  
Chun Yan Zhuang ◽  
De Qin Meng
Keyword(s):  
Sulfuric Acid ◽  
Calcium Sulfate ◽  
Preparation Method ◽  
Orthogonal Experiment ◽  
Raw Material ◽  
High Grade ◽  
Reaction Conditions ◽  
Acid Reaction ◽  
Calcium Sulfate Whiskers ◽  
Calcium Sulfate Whisker

Taking leaching tailings of the nickel ore as raw material, calcium sulfate whiskers were prepared. The effects of Mg/Ca mole ratio, concentration of sulfuric acid, reaction temperature and precipitating time on the recovery of calcium were studied in this paper. The preparation method and reaction conditions of fibrous calcium sulfate whisker have been optimized by an orthogonal experiment, in order to obtain a high grade whisker product which could meet industrial requirements on whiteness and size.

scholarly journals Hydration affects the physical and mechanical properties of baleen tissue

2016 ◽  
Vol 3 (10) ◽  
pp. 160591 ◽  
Author(s):  
Alexander J. Werth ◽  
Robert W. Harriss ◽  
Michael V. Rosario ◽  
J. Craig George ◽  
Todd L. Sformo
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Contact Angles ◽  
Eubalaena Glacialis ◽  
Bending Tests ◽  
Bowhead Whales ◽  
North Atlantic Right Whales ◽  
Hydrophobic Pollutants ◽  
And Function ◽  
Alpha Keratin

Baleen, an anisotropic oral filtering tissue found only in the mouth of mysticete whales and made solely of alpha-keratin, exhibits markedly differing physical and mechanical properties between dried or (as in life) hydrated states. On average baleen is 32.35% water by weight in North Atlantic right whales ( Eubalaena glacialis ) and 34.37% in bowhead whales ( Balaena mysticetus ). Baleen's wettability measured by water droplet contact angles shows that dried baleen is hydrophobic whereas hydrated baleen is highly hydrophilic. Three-point flexural bending tests of mechanical strength reveal that baleen is strong yet ductile. Dried baleen is brittle and shatters at about 20–30 N mm −2 but hydrated baleen is less stiff; it bends with little force and absorbed water is squeezed out when force is applied. Maximum recorded stress was 4× higher in dried (mean 14.29 N mm −2 ) versus hydrated (mean 3.69 N mm −2 ) baleen, and the flexural stiffness was >10× higher in dried (mean 633N mm −2 ) versus hydrated (mean 58 N mm −2 ) baleen. In addition to documenting hydration's powerful effects on baleen, this study indicates that baleen is far more pliant and malleable than commonly supposed, with implications for studies of baleen's structure and function as well as its susceptibility to oil or other hydrophobic pollutants.

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