scholarly journals Facile and Controllable Preparation of poly(St-co-MMA)/FA Microspheres Used as Ultra-Lightweight Proppants

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7390
Author(s):  
Tao Chen ◽  
Yanan Sang ◽  
Yuxin Zhou ◽  
Liudi Ji ◽  
Xiaobing Han ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Hydraulic Fracturing ◽  
High Performance ◽  
High Pressures ◽  
Suspension Polymerization ◽  
Gas Reservoirs ◽  
High Compressive Strength ◽  
Composite Microspheres ◽  
Fracture Systems ◽  
The Matrix

Hydraulic fracturing is an important technology for the exploitation of unconventional oil or gas reservoirs. In order to increase the production of oil or gas, ultra-lightweight proppants with a high compressive strength are highly desirable in hydraulic fracture systems. In this work, a new type of ultra-lightweight proppant, poly(styrene-co-methyl methacrylate)/fly ash (poly(St-co-MMA)/FA) composites with a high compressive strength were prepared via in situ suspension polymerization. The Fourier transform infrared (IR) and X-ray powder diffraction (XRD) analyses confirmed that the poly(St-co-MMA)/FA composites were successfully prepared. The morphology analysis indicated that the composite microspheres show good sphericity, and FA powder was evenly dispersed in the matrix. The apparent density of the microspheres was between 1 and 1.3 g/cm3, which is suitable for hydraulic fracturing. Furthermore, the compressive strength and thermostability were dramatically improved with the incorporation of FA, which could withstand high pressures and temperatures underground. The obtained poly(St-co-MMA)/FA composite microspheres are promising for application as an ultra-lightweight (ULW) proppant in oil or gas exploitation, which provides a new approach for the design of high performance proppants.

scholarly journals Facile approach for a robust graphene/silver nanowires aerogel with high-performance electromagnetic interference shielding

RSC Advances ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 27-33 ◽  
Author(s):  
Xiaoting Liu ◽  
Tianrui Chen ◽  
Hao Liang ◽  
Faxiang Qin ◽  
Hui Yang ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Electrical Properties ◽  
Electromagnetic Interference ◽  
High Performance ◽  
Silver Nanowires ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
High Compressive Strength

We report a facile, eco-friendly approach to prepare the robust graphene/silver nanowires aerogel with high compressive strength and excellent EMI shielding performance due to its unique nanostructure and good electrical properties.

Study on Preparation and Properties of PMMA Composite Microspheres as the Matrix of Low Density Proppant

2013 ◽  
Vol 457-458 ◽  
pp. 116-119 ◽  
Author(s):  
Yang Cheng Xu ◽  
Tao Chen ◽  
Jiao Li Hu ◽  
Cong Hai Tang ◽  
Rui Ma ◽  
...  
Keyword(s):  
Theoretical Basis ◽  
Performance Test ◽  
Suspension Polymerization ◽  
High Strength ◽  
Synthesis Process ◽  
Cross Linking ◽  
Low Density ◽  
Oil Drilling ◽  
Composite Microspheres ◽  
The Matrix

In this paper, suspension polymerization is used for the preparation of PMMA microspheres, PMMA cross-linking DVB microspheres, PMMA-co-St composite microspheres and PMMA-St-SiO2 composite microspheres, and apply IR spectroscopy, scanning electron microscopy, compressive strength, density, thermal analysis to the prepared polymer microspheres. The purpose of our work is to find the feasibility method of synthesis process for PMMA material and composite microspheres, and the prepared theoretical basis of proppant with low density and high strength for oil drilling applications by performance test.

scholarly journals Effect on Addition of Nano "Titanium Dioxide” (TiO2)on Compressive Strength of Cementitious Concrete

10.29007/sq9d ◽  
2018 ◽  
Author(s):  
Jay Sorathiya ◽  
Siddharth Shah ◽  
Smit Kacha
Keyword(s):  
Compressive Strength ◽  
Titanium Dioxide ◽  
High Performance ◽  
Nano Materials ◽  
Cementitious Composite ◽  
Strength Parameters ◽  
Conventional Concrete ◽  
High Compressive Strength ◽  
Strength And Durability ◽  
Nano Titanium Dioxide

Cementitious concrete has great practical difficulties in achieving high compressive strength and durability of high performance structures. But it becomes a challenge to increase the compressive strength and durability of particular cementitious composite and also maintaining basic desirable properties of concrete. This paper addresses these problems by the addition of nano-materials. In this study, an attempt is made to understand the effect of Anatase Nano Titanium Dioxide (TiO2), on Conventional Concrete (CC) of M20 grade with various proportions 0.5%, 0.75%, 1.0%, 1.25%, 1.5% in relation with the weight of cement. The Workability, Strength parameters at various proportions of Anatase Nano Titanium Dioxide (TiO2) are tested at different durations. The results obtained are being discussed in the paper.

VANADIS 23

Alloy Digest ◽  
1997 ◽  
Vol 46 (3) ◽  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Tool Steel ◽  
Molten Steel ◽  
High Performance ◽  
Heat Treating ◽  
Bend Strength ◽  
High Compressive Strength ◽  
Carbide Particles

Abstract Vanadis 23 is a high-performance tool steel produced from superclean molten steel, which is then atomized to powder. The alloy is characterized by uniformly distributed carbide particles that help in its good mechanical properties, toughness, and bend strength. Vanadis 23 is recommended for mixed-wear (abrasive and adhesive) resistance and high compressive strength. This datasheet provides information on composition, and microstructure. It also includes information on heat treating, machining, and joining. Filing Code: TS-552. Producer or source: Uddeholm Corporation. See also Alloy Digest TS-561, October 1998.

Compressive Strength and Flexural Properties of High Performance Nano-Binder Cementitious Composites

2013 ◽  
Vol 275-277 ◽  
pp. 2064-2068 ◽  
Author(s):  
Xiang Gao ◽  
Qing Hua Li ◽  
Shi Lang Xu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
High Performance ◽  
Flexural Properties ◽  
Cementitious Composites ◽  
Nano Sio2 ◽  
The Matrix ◽  
Average Crack ◽  
Sio2 Particles ◽  
Pva Fiber

High performance nano-binder cementitious composites (HPNCC) are ultra-ductile fiber reinforced cementitious composites with special matrix. The compressive strength and flexural properties of HPNCC containing nano-SiO2 particles were investigated at age of 3d, 7d, 14d and 28d. According to the results, HPNCC exhibited excellent mechanical properties in the test. The compressive strength, flexural strength and first crack strain of HPNCC were all increased obviously at early age except the ultimate strain. In the flexural test, both crack extension width and the number of fine cracks decrease along with the curing age. However, the average crack spacing has no remarkable changes. Nano-SiO2 particles in HPNCC acted as ultra-fine fillers and catalyzers to strengthen the interfacial bond between the matrix and PVA fiber which improved the mechanical properties and would make HPNCC be widely used in the engineering.

scholarly journals Mix Design and Mechanical Properties of High-Performance Pervious Concrete

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2577 ◽  
Author(s):  
Chao-Wei Tang ◽  
Chiu-Kuei Cheng ◽  
Ching-Yuan Tsai
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Orthogonal Array ◽  
High Performance ◽  
Cementitious Material ◽  
Pervious Concrete ◽  
Mix Design ◽  
Fine Aggregate ◽  
Matrix Type ◽  
The Matrix

The mechanical properties of traditional pervious concrete are insufficient, which limits its application. In view of the imperfections of traditional permeable concrete in mechanics, this paper aimed to find a suitable material composition that can be used as a feasible mix design of high-performance pervious concrete, to essentially improve its mechanical properties. Based on the view that concrete is a two-phase material, in order to understand the rheological properties of the matrix, it was subjected to a rheological test, and then the filler aggregate was uniformly incorporated into the aforementioned matrix to further explore the composition and properties of the resulting pervious concrete. For the matrix, the orthogonal array employed was L16(45), which consisted of five factors, each with four levels. Base on the fluidity and compressive strength of the tested matrix, three groups of suitable matrixes mix proportions were selected to serve as the matrix type for pervious concrete mix proportion design. Then, an orthogonal array L9(34), which consisted of four controllable three-level factors, was adopted in the pervious concrete. The parameters investigated included the coarse aggregate size, fine aggregate content, matrix type, and aggregate-to-binder ratio. The test results demonstrate that the key factors affecting the compressive strength of the matrix and the pervious concrete were closely related to the cementitious material. In the matrix, the proportion of the cementitious material was the most important factor, while in the pervious concrete, the type of matrix was the most important factor.

Morphology of High-Performance Rigid-Rod Polymer Fibers and Molecular Composites

1989 ◽  
Vol 47 ◽  
pp. 338-339
Author(s):  
W.W. Adams ◽  
S. J. Krause
Keyword(s):  
Tensile Strength ◽  
High Performance ◽  
Liquid Crystalline ◽  
Molecular Level ◽  
Synergistic Effects ◽  
Tensile Modulus ◽  
Commercial Development ◽  
The Matrix ◽  
Molecular Composites ◽  
Rigid Rod

Rigid-rod polymers such as PBO, poly(paraphenylene benzobisoxazole), Figure 1a, are now in commercial development for use as high-performance fibers and for reinforcement at the molecular level in molecular composites. Spinning of liquid crystalline polyphosphoric acid solutions of PBO, followed by washing, drying, and tension heat treatment produces fibers which have the following properties: density of 1.59 g/cm3; tensile strength of 820 kpsi; tensile modulus of 52 Mpsi; compressive strength of 50 kpsi; they are electrically insulating; they do not absorb moisture; and they are insensitive to radiation, including ultraviolet. Since the chain modulus of PBO is estimated to be 730 GPa, the high stiffness also affords the opportunity to reinforce a flexible coil polymer at the molecular level, in analogy to a chopped fiber reinforced composite. The objectives of the molecular composite concept are to eliminate the thermal expansion coefficient mismatch between the fiber and the matrix, as occurs in conventional composites, to eliminate the interface between the fiber and the matrix, and, hopefully, to obtain synergistic effects from the exceptional stiffness of the rigid-rod molecule. These expectations have been confirmed in the case of blending rigid-rod PBZT, poly(paraphenylene benzobisthiazole), Figure 1b, with stiff-chain ABPBI, poly 2,5(6) benzimidazole, Fig. 1c A film with 30% PBZT/70% ABPBI had tensile strength 190 kpsi and tensile modulus of 13 Mpsi when solution spun from a 3% methane sulfonic acid solution into a film. The modulus, as predicted by rule of mixtures, for a film with this composition and with planar isotropic orientation, should be 16 Mpsi. The experimental value is 80% of the theoretical value indicating that the concept of a molecular composite is valid.

MOLDSTAR 90

Alloy Digest ◽  
2005 ◽  
Vol 54 (3) ◽  
Keyword(s):  
Compressive Strength ◽  
Injection Molding ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Copper Alloy ◽  
High Performance ◽  
Blow Molding

Abstract MoldStar 90 is a high-performance beryllium-free copper alloy for the blow-molding and injection-molding industries. This datasheet provides information on composition, physical properties, hardness, tensile properties, and compressive strength. It also includes information on machining, joining, and surface treatment. Filing Code: CU-732. Producer or source: Performance Alloys.

MOLDSTAR 150

Alloy Digest ◽  
2005 ◽  
Vol 54 (2) ◽  
Keyword(s):  
Compressive Strength ◽  
Injection Molding ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Copper Alloy ◽  
High Performance ◽  
Blow Molding

Abstract MoldStar 150 (formerly PAS 940) is a high performance copper alloy for the blow-molding and injection-molding industries. This datasheet provides information on composition, physical properties, tensile properties, and compressive strength. It also includes information on forming, machining, joining, and surface treatment. Filing Code: CU-729. Producer or source: Performance Alloys.

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