Effect of Chemical Foaming Agent in Enhancing Dispersion of Montmorillonite in Polypropylene Nanocomposite

2019 ◽  
Vol 8 ◽  
pp. 1-6
Author(s):  
Ozan Azguler ◽  
Meltem Eryildiz ◽  
Mirigul Altan ◽  
Keyword(s):  
Foaming Agent ◽  
Chemical Foaming

Research on the Performance of Plaster Material by Chemical Foaming Method

2013 ◽  
Vol 830 ◽  
pp. 435-438
Author(s):  
Hong Xia Wang ◽  
Bo Liu ◽  
Kuang Ping Yuan ◽  
Wu Biao Duan ◽  
Fei Hua Yang ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Water Temperature ◽  
Chemical Reaction ◽  
Raw Material ◽  
Foaming Agent ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Chemical Foaming

The paper introduces a kind of foaming plaster with main raw material of α- gypsum, which is produced by utilizing the chemical reaction principles H2O2 was decomposed. Meanwhile，study the changes of density，flexural strength and compressive strength of plaster material performance with the additives in different ratio. The result showed that water-cement ratio, H2O2 foaming agent and water temperature all affect the performance of the foaming plaster.

Experimental study on micro-porous patterning using UV pulse laser hybrid process with chemical foaming agent

2015 ◽  
Vol 16 (7) ◽  
pp. 1385-1390 ◽  
Author(s):  
Chan Park ◽  
Bo-Sung Shin ◽  
Moon-Suk Kang ◽  
Yong-Won Ma ◽  
Jae-Yong Oh ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pulse Laser ◽  
Hybrid Process ◽  
Foaming Agent ◽  
Laser Hybrid ◽  
Chemical Foaming

scholarly journals One-shot Molding Technique of Cross-linked Polymer Foams by Using Chemical Foaming Agent

Seikei-Kakou ◽  
2018 ◽  
Vol 30 (6) ◽  
pp. 239-242
Author(s):  
Junichiro Tateishi ◽  
Masataka Sugimoto
Keyword(s):  
Polymer Foams ◽  
Foaming Agent ◽  
Chemical Foaming

scholarly journals Optimization of pore structure and wet tribological properties of paper-based friction materials using chemical foaming technology

Friction ◽  
2021 ◽  
Author(s):  
Chang Li ◽  
Jie Fei ◽  
Enzhi Zhou ◽  
Rui Lu ◽  
Xiaohang Cai ◽  
...  
Keyword(s):  
Wear Rate ◽  
Pore Structure ◽  
Tribological Properties ◽  
Organic Chemical ◽  
Average Pore ◽  
Friction Materials ◽  
Foaming Agent ◽  
The Matrix ◽  
Foaming Technology ◽  
Chemical Foaming

AbstractPaper-based friction materials are porous materials that exhibit anisotropy; they exhibit random pore sizes and quantities during their preparation, thereby rendering the control of their pore structure difficult. Composites with different pore structures are obtained by introducing chemical foaming technology during their preparation to regulate their pore structure and investigate the effect of pore structure on the properties of paper-based friction materials. The results indicate that the skeleton density, total pore area, average pore diameter, and porosity of the materials increase after chemical foaming treatment, showing a more open pore structure. The addition of an organic chemical foaming agent improves the curing degree of the matrix significantly. Consequently, the thermal stability of the materials improves significantly, and the hardness and elastic modulus of the matrix increase by 73.7% and 49.4%, respectively. The dynamic friction coefficient increases and the wear rate is reduced considerably after optimizing the pore structure. The wear rate, in particular, decreases by 47.7% from 2.83 × 10−8 to 1.48 × 10−8 cm3/J as the foaming agent content increases. Most importantly, this study provides an effective method to regulate the pore structure of wet friction materials, which is conducive to achieving the desired tribological properties.

scholarly journals Investigation on the mechanical and morphological properties of foamed nanocomposites based on wood flour/PVC/multi-walled carbon nanotube

BioResources ◽  
2011 ◽  
Vol 6 (1) ◽  
pp. 841-852
Author(s):  
Afshin Tavassoli Farsheh ◽  
Mohammad Talaeipour ◽  
Amir Homan Hemmasi ◽  
Habib Khademieslam ◽  
Ismaeil Ghasemi
Keyword(s):  
Water Absorption ◽  
Wood Flour ◽  
Batch Process ◽  
Morphological Properties ◽  
Thickness Swelling ◽  
Foaming Agent ◽  
Plastic Composite ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Chemical Foaming

Recently, the use of nanoparticles in Wood Plastic Composites (WPCs) has been considered by researchers. In this study, Multi-Walled Carbon Nanotubes (MWCNTs) were compounded with PVC, wood-flour, and foaming agent in an internal mixer. The wood flour amount was constant at 40 phr. For CNT and chemical foaming agent , different levels of 0, 1, 2 phr and 0, 3, 6 phr were considered respectively. The samples were foamed via batch process using a compression molding machine at 180°C. Morphology, density, water absorption, thickness swelling, and tensile properties of foamed composites were evaluated as a function of CNT and chemical foaming agent contents. The experimental results indicated that in the presence of CNT, cell density increased and cell size decreased. Density of the foamed composites was not affected by chemical foaming agent contents. Water absorption and thickness swelling of samples were decreased as compared with wood plastic composite without CNTs. Also, the maximum tensile strength and modulus were increased by up to 20% and 23% respectively.

scholarly journals Preparation of Porous Materials by Magnesium Phosphate Cement with High Permeability

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Lai Zhenyu ◽  
Hu Yang ◽  
Fu Xiaojie ◽  
Lu Zhongyuan ◽  
Lv Shuzhen
Keyword(s):  
Compressive Strength ◽  
Pore Size ◽  
Average Pore Size ◽  
Zinc Powder ◽  
Magnesium Phosphate ◽  
High Permeability ◽  
Average Pore ◽  
Foaming Agent ◽  
Powder Content ◽  
Chemical Foaming

High permeability and strength magnesium phosphate cement (MPC) with porosity, average pore size, and compressive strength varied from 63.2% to 74%, 138.7 μm to 284.7 μm and 2.3 MPa to 4.7 MPa, respectively, were successfully prepared by combining the physical foaming method and chemically entrained gas method at room temperature. The effects of borax content, chemical foaming agent content, zinc powder content and W/S ratio on the porosity, pore size distribution, compressive strength, and permeability of the MPC were investigated. The results indicate that the chemical foaming agent content tends to have little impact on the porosity and compressive strength, and the zinc powder content has the most significant influence on the average pore size of MPC. The air pores distribution and connectivity of MPC were mainly controlled by the borax content, W/S ratio, and chemical foaming agent content. Zinc powder played a destructive role in the pores formed by the early physical foaming and led to an increase in pore size and a large number of through pores, which increased the permeability of the materials.

Effect of the particle diameter of the chemical foaming agent on the foaming process and the cellular structure of one-shot compression molded polyethylene foams

2018 ◽  
Vol 38 (1) ◽  
pp. 41-50 ◽  
Author(s):  
Junichiro Tateishi ◽  
Tsuyoshi Nishiwaki ◽  
Sathish K. Sukumaran ◽  
Masataka Sugimoto
Keyword(s):  
Thermal Decomposition ◽  
Time Dependence ◽  
Cellular Structure ◽  
Particle Diameter ◽  
Cavity Pressure ◽  
Number Density ◽  
Foaming Agent ◽  
Proportionality Constant ◽  
Foaming Process ◽  
Chemical Foaming

Abstract We investigated the effect of varying the particle diameter and the particle content of a chemical foaming agent on the foaming process and the cellular structure of one-shot compression molded polyethylene foams. We foamed metallocene linear low-density polyethylene (LLDPE) crosslinked by dicumyl peroxide using azodicarbonamide (ADCA) as the foaming agent. We used a purpose-built metal mold equipped with a built-in pressure sensor to monitor the time evolution of the cavity pressure. The time dependence of the cavity pressure, which is indicative of the thermal decomposition of the ADCA, was s-shaped. The s-shaped time dependence of the cavity pressure indicates that, after an initial induction phase during which there is no thermal decomposition of the ADCA, the ADCA rapidly decomposes until the reaction is essentially complete. The cavity pressure at saturation, which corresponds to the mass of the generated gas, was linearly proportional to the ADCA content but only weakly dependent on the particle diameter of the ADCA. Upon decreasing the particle diameter of ADCA, rise in the cavity pressure at intermediate times, which indicates the thermal decomposition of the ADCA, began earlier and was faster. The cell size in the final foam decreased with a decrease in the particle diameter of the ADCA. The cell number density in the unfoamed samples (NF) was proportional to the ADCA particle number density in the unfoamed samples (NC), with a proportionality constant less than 1. A model for the foaming process where the ADCA particles nucleate cells and the nucleated cells then coalesce, thereby reducing the number of remaining cells, can offer an explanation for the observed proportionality between NF and NC and the proportionality constant being less than 1. Furthermore, it is proposed that cell coalescence occurs if the increase in the moduli of the LLDPE due to crosslinking is not sufficient to prevent the coalescence of the cells triggered by the rapid increase in the cavity pressure due to the rapid decomposition of ADCA.

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