Preparation of polyethylene–octene elastomer foams by compression molding

Mao, Yapeng; Qi, Rongrong

doi:10.1002/app.28415

Cited by 19 publications

(15 citation statements)

References 21 publications

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“…In previous research, zinc oxide and zinc stearate were used as activators to modify azo class, and thermal analysis was applied to discuss the change of decomposition temperature . Using base, such as urea or amine, to activate OBSH is a well‐known technique .…”

Section: Introductionsupporting

confidence: 71%

Urea‐activated 4,4'‐oxibis‐(benzenesulfonyl hydrazide) as foaming agent for low‐density unsaturated polyester resin manufacturing

Zhang

Wang

Pan

et al. 2015

J of Applied Polymer Sci

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The activation of foaming agent is critical to its application. In this study, 4,4 0 -oxibis-(benzenesulfonyl hydrazide) (OBSH) activated by urea was used in the manufacture of low-density unsaturated polyester resin (LDUPR), and the results were compared with that of OBSH activated by zinc oxide and zinc stearate. The experiment results showed that the activation of OBSH by urea was better than by zinc oxide or by zinc stearate. A novel hydrogen bond activation mechanism of urea is presented in this research. Two stages, including the induction stage and the foaming stage, were proposed in the LDUPR manufacture according to the gas evolution curves of activated OBSH. The decomposition temperature and the decomposition time of OBSH activated by urea were determined to match the gelation time of UPR for the manufacture of LDUPR. The disadvantageous chemical behaviors of activated OBSH were eliminated in the induction treatment. The activated OBSH via induction treatment released gas maximally and distributed gas homogeneously in the resin glue, resulting in a better foaming effect than that of the previous foaming agents.

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Section: Introductionsupporting

confidence: 71%

Urea‐activated 4,4'‐oxibis‐(benzenesulfonyl hydrazide) as foaming agent for low‐density unsaturated polyester resin manufacturing

Zhang

Wang

Pan

et al. 2015

J of Applied Polymer Sci

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“…The long-term service temperatures of most common polymeric foams are lower than 200 o C, and 5% weight loss temperatures are lower than 450 o C in air. [1][2][3] The long-time service temperatures of PI foams are higher than 200 o C. The glass translation temperatures of some PI foams are higher than 300 o C. Therefore, PI foam has been applied as thermal and acoustic insulation materials in the fields of aerospace and navigation, which may be due to its high and low temperature resistance, low smoke, low toxicity, low volatile, no halogen, no ozone consumption, easy installation, and so on. [4][5][6][7][8] But, PI foam will degrade rapidly at more than 500 o C. In reusable launch vehicle (RLV) mission from launch to orbit and to reentry, the surface temperature of PI foam used as thermal protection system (TPS) will increase rapidly in short time and PI foam will degrade or fall off.…”

Section: Introductionmentioning

confidence: 99%

The pyrolysis behaviors of polyimide foam derived from 3,3′,4,4′‐benzophenone tetracarboxylic dianhydride/4,4′‐oxydianiline

Shen

Zhan

Wang

et al. 2009

J of Applied Polymer Sci

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ABSTRACT:The thermal stability and pyrolysis behaviors of polyimide (PI) foam derived from 3,3 0 ,4,4 0 -benzophenone tetracarboxylic dianhydride (BTDA)/4,4 0 -oxydianiline (4,4 0 -ODA) in air and in nitrogen were studied. The decomposition products of PI foam were analyzed by thermogravimetry-Fourier transform infrared spectroscopy (TG-FTIR). Several integral and differential methods reported in the literatures were used in decomposition kinetics analysis of PI foam. The results indicated that the PI foam was easier to decompose in air than in nitrogen, with $ 55% residue remaining in nitrogen versus zero in air at 800 o C. The main pyrolysis products were CO 2 , CO, and H 2 O in air and CO 2 , CO, H 2 O, and small organic molecules in nitrogen. The different dynamic methods gave similar results that the apparent activation energies, pre-exponential factors, and reaction orders were higher in nitrogen than those in air.

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“…Batch,5–27 semicontinuous,28 continuous extrusion,29–37 compression molding,38, 39 rotational molding,40 and injection molding41–44 techniques have been developed to prepare microcellular polymeric foams using sc‐CO 2 as a physical blowing agent during the past two decades. Microcellular foaming of polymer blends,13, 18, 21, 22, 24, 31, 33, 34 polymer‐based nanocomposites,17, 21, 24, 32 and polymer blend nanocomposites18, 21, 24 have been a subject of substantial research recently.…”

Section: Introductionmentioning

confidence: 99%

Preparation of microcellular polypropylene/polystyrene blend foams with tunable cell structure

Huang¹,

Xu²

2011

Polymers for Advanced Techs

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By using supercritical carbon dioxide (sc‐CO2) as the physical foaming agent, microcellular foaming was carried out in a batch process from a wide range of immiscible polypropylene/polystyrene (PP/PS) blends with 10–70 wt% PS. The blends were prepared via melt processing in a twin‐screw extruder. The cell structure, cell size, and cell density of foamed PP/PS blends were investigated and explained by combining the blend phase morphology and morphological parameters with the foaming principle. It was demonstrated that all PP/PS blends exhibit much dramatically improved foamability than the PP, and significantly decreased cell size and obviously increased cell density than the PS. Moreover, the cell structure can be tunable via changing the blend composition. Foamed PP/PS blends with up to 30 wt% PS exhibit a closed‐cell structure. Among them, foamed PP/PS 90:10 and 80:20 blends have very small mean cell diameter (0.4 and 0.7 µm) and high cell density (8.3 × 1011 and 6.4 × 1011 cells/cm3). Both of blends exhibit nonuniform cell structure, in which most of small cells spread as “a string of beads.” Foamed PP/PS 70:30 blend shows the most uniform cell structure. Increase in the PS content to 50 wt% and especially 70 wt% transforms it to an irregular open‐cell structure. The cell structure of foamed PP/PS blends is strongly related to the blend phase morphology and the solubility of CO2 in PP more than that in PS, which makes the PP serve as a CO2 reservoir. Copyright © 2009 John Wiley & Sons, Ltd.

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Preparation of polyethylene–octene elastomer foams by compression molding

Cited by 19 publications

References 21 publications

Urea‐activated 4,4'‐oxibis‐(benzenesulfonyl hydrazide) as foaming agent for low‐density unsaturated polyester resin manufacturing

Urea‐activated 4,4'‐oxibis‐(benzenesulfonyl hydrazide) as foaming agent for low‐density unsaturated polyester resin manufacturing

The pyrolysis behaviors of polyimide foam derived from 3,3′,4,4′‐benzophenone tetracarboxylic dianhydride/4,4′‐oxydianiline

Preparation of microcellular polypropylene/polystyrene blend foams with tunable cell structure

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