A Chemical Blowing Agent System (CBAS) Based on Azodicarbonamide

Sims, G. L. A.; Jaafar, Haslina

doi:10.1177/0021955x9403000205

Cited by 25 publications

(17 citation statements)

References 4 publications

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“…Since a fixed amount of material (650 g) was loaded for each formulation the average part thickness increased by up to 370%. This high increase is associated to the high blowing efficiency of ACA (210 cm 3 of gas/g) . Another parameter favoring the nucleation and growth of bubbles is the viscosity of the molten polymer.…”

Section: Resultsmentioning

confidence: 99%

“…Nowadays, they can be optimized using internal air temperature (IAT) profiles as a first approximation to infer the state of the material inside the mold during processing . Based on IAT profiles, physical transitions related to heat transfer can be determined . Cramez et al explained in details the key stages of the rotomolding cycle using IAT profiles.…”

Section: Introductionmentioning

confidence: 99%

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Thermal analysis of foamed polyethylene rotational molding followed by internal air temperature profiles

González‐Núñez

Moscoso-Sánchez

Aguilar

et al. 2017

Polymer Engineering & Sci

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In this study, the internal air temperature (IAT) profile was measured to analyze the thermal behavior of a polymer for a complete rotational molding cycle. Foamed and unfoamed linear low density polyethylene parts were produced by biaxial rotational molding using a chemical blowing agent based on azodicarbonamide at different concentrations (0, 0.15, 0.25, 0.50, 0.75, and 1.0% wt) with different oven temperatures (270, 280, and 285°C). The analysis proposed is based on the temperature profiles and their derivatives to better determine the different transitions occurring in a complete molding cycle. The analysis is completed with differential scanning calorimetry (DSC) to get more information related to the dynamics of the different processing stages like polymer melting, exothermic decomposition of the chemical blowing agent, and polymer crystallization. The results obtained show a good agreement between the melting and crystallization temperatures from IAT derivatives and DSC. POLYM. ENG. SCI., 58:E235–E241, 2018. © 2017 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal analysis of foamed polyethylene rotational molding followed by internal air temperature profiles

González‐Núñez

Moscoso-Sánchez

Aguilar

et al. 2017

Polymer Engineering & Sci

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“…Activators can lower the decomposition temperatures of blowing agents. Some studies [5, 14, 16] have found that the addition of ZnO or ZnSt to the chemical foaming agent AZDC not only lowered the decomposition temperature but also accelerated its decomposition. Our previous study found that the optimal curing temperature of CM/EVA was about 170°C.…”

Section: Resultsmentioning

confidence: 99%

“…According to Tai et al [2, 3] additives such as Zinc Oxide (ZnO) and/or Zinc Stearate (ZnSt) were employed as cell stabilizers or cell nucleation agents, as well as activators for chemical blowing agents. The decomposition behavior of AZDC was one function of particle size, heating rate, activator type, and concentration and uniformity of dispersion, which affect the total gas yields, and the rate of gas evolution of AZDC to eventually change the properties of foams [4–6].…”

Section: Introductionmentioning

confidence: 99%

Properties of chlorinated polyethylene rubber/ethylene vinyl acetate copolymer blend‐based foam

Zhang

et al. 2011

Polymer Engineering & Sci

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A series of chlorinated polyethylene rubber (CM)/ethylene vinyl acetate (EVA) blends were prepared at different blending ratio. The blends were foamed by compression molding and azodicarbonamide (AZDC) was used as chemical blowing agent. Cure characteristics were researched first, and then the morphology and physical properties were investigated. It was found that neat CM foams presented a series of problems such as low hardness and high shrinkage ratio. To solve the above problems, some EVA was added into CM matrix. And the results indicated that these aforementioned defects were improved after the addition of EVA component. Tensile strength increased first and then fell, and morphology properties of CM/EVA blends were also investigated. POLYM. ENG. SCI., 2012. © 2011 Society of Plastics Engineers

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“…Additives such as ZnO and/or Zn-St are employed as cell stabilizers or cell nucleation agents, as well as activators for chemical blowing agents [20]. The decomposition behavior of AZDC is a function of particle size, heating rate, activator type, and concentration and uniformity of dispersion, which affect the total gas yields and the rate of gas evolution of AZDC that eventually govern the properties of foams [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Effects of formulation and processing parameters on the morphology of extruded polypropylene‐(waste ground rubber tire powder) foams

Xin¹,

Zhang²,

Pal³

et al. 2009

Vinyl Additive Technology

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This paper presents an experimental study of the foaming behavior of polypropylene (PP)/(waste ground rubber tire powder) (WGRT) blends when using a chemical blowing agent in an extrusion foaming process. The effects of formulations (i.e., WGRT content, blowing agent content, compatibilizer) and the processing parameters (i.e., die temperature, screw speed) on the void fraction, average cell size, cell density, and cell morphology of the PP/WGRT foams were investigated. The blowing agent loading affected the cell structure of the foams and the average cell size, and the void fraction increased with increasing blowing agent loading. Both increasing the screw speed and decreasing the die temperature could establish a high pressure drop in the extruder die, and these were beneficial to the foaming extrusion. J. VINYL ADDIT. TECH-NOL., 15:266-274, 2009. ª

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A Chemical Blowing Agent System (CBAS) Based on Azodicarbonamide

Cited by 25 publications

References 4 publications

Thermal analysis of foamed polyethylene rotational molding followed by internal air temperature profiles

Thermal analysis of foamed polyethylene rotational molding followed by internal air temperature profiles

Properties of chlorinated polyethylene rubber/ethylene vinyl acetate copolymer blend‐based foam

Effects of formulation and processing parameters on the morphology of extruded polypropylene‐(waste ground rubber tire powder) foams

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