Foaming Behavior and Mechanical Properties of Microcellular PP/SiO2Composites

2012 ◽  
Vol 27 (2) ◽  
pp. 181-186 ◽  
Author(s):  
W. Gong ◽  
K. J. Liu ◽  
C. Zhang ◽  
J. H. Zhu ◽  
L. He
Keyword(s):  
Mechanical Properties ◽  
Foaming Behavior

Mechanical properties, crystallization characteristics, and foaming behavior of polytetrafluoroethylene-reinforced poly(lactic acid) composites

2016 ◽  
Vol 57 (5) ◽  
pp. 570-580 ◽  
Author(s):  
An Huang ◽  
Hrishikesh Kharbas ◽  
Thomas Ellingham ◽  
Haoyang Mi ◽  
Lih-Sheng Turng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Foaming Behavior

scholarly journals Fabrication of lightweight and high-strength carbon fiber-reinforced poly(ethylene-2,6-naphthalene) solid and foam composites

2020 ◽  
Vol 29 ◽  
pp. 2633366X2092255
Author(s):  
Yi-Fan Chen ◽  
Ying-Guo Zhou ◽  
Ming Huang
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
High Performance ◽  
High Strength ◽  
Thermoplastic Composites ◽  
Reinforced Composites ◽  
Foaming Behavior ◽  
The Matrix ◽  
Poly Ethylene ◽  
Engineering Polymers

Poly(ethylene-2,6-naphthalene) (PEN) is one of the most important engineering polymers with high performance. However, the effects and foaming behavior of carbon fiber (CF)-reinforced PEN (CFRPEN) remain to be explored. In this study, PEN was used as the matrix for CF-reinforced composites, and its foaming behavior and mechanical properties were investigated. High mechanical properties can be evaluated through comparison with other similar CF-reinforced thermoplastic composites. A fabrication method to generate lightweight and high-strength CFRPEN composites is hence proposed.

Morphological, thermo-mechanical, and thermal conductivity properties of halloysite nanotube-filled polypropylene nanocomposite foam

2016 ◽  
Vol 54 (2) ◽  
pp. 217-233 ◽  
Author(s):  
Renan Demori ◽  
Eveline Bischoff ◽  
Ana P de Azeredo ◽  
Susana A Liberman ◽  
Joao Maia ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Size ◽  
Cell Density ◽  
Void Fraction ◽  
Cell Structure ◽  
Cell Size Distribution ◽  
Halloysite Nanotube ◽  
Dynamic Mechanical ◽  
Foaming Behavior ◽  
Homogeneous Cell

Studies about polypropylene nanocomposite foams are receiving attention because nanoparticles can change physical and mechanical properties, as well as improve foaming behavior in terms of homogeneous cell structure, cell density, and void fraction. In this research, the foaming behavior of polypropylene, polypropylene/long-chain branched polypropylene (LCBPP) 100/20 blend, and polypropylene/LCBPP/halloysite nanocomposites with 0.5 and 3 parts per hundred of resin (phr) is studied. The LCBPP was used to improve the rheological properties of polypropylene/LCBPP blend, namely the degree of strain-hardening. Transmission electron microscopy observation indicated that halloysite nanotube particles are well distributed in the matrix by aggregates. Subsequent foaming experiments were conducted using chemical blowing agent in injection-molding processing. Polypropylene foam exhibited high cell density and cell size as well as a collapsing effect, whereas the polypropylene/LCBPP blend showed a reduction of the void fraction and cell density compared to expanded polypropylene. Also, the blend showed reduction of the collapsing effect and increase of homogeneous cell size distribution. The introduction of a small amount of halloysite nanotube in the polypropylene/LCBPP blend improved the foaming behavior of the polypropylene, with a uniform cell structure distribution in the resultant foams. In addition, the cell density of the composite sample was higher than the polypropylene/LCBPP sample, having increased 82% and 136% for 0.5 and 3 phr of loaded halloysite nanotube, respectively. Furthermore, the presence of halloysite nanotube increased crystallization temperature (Tc) and slightly increased dynamic-mechanical properties measured by dynamic-mechanical thermal analysis. By increasing halloysite nanotube content to 3 phr, the insulating effect increased by 13% compared to polypropylene/LCBPP blend. For comparative purposes, the effect on foaming behavior of polypropylene/LCBPP was also investigated using talc microparticles.

Preparation and properties of flexible poly(lactic acid) blend foams

2018 ◽  
Vol 37 (4-6) ◽  
pp. 189-205 ◽  
Author(s):  
Liu Wei ◽  
He Shicheng ◽  
Zhou Hongfu
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Constitutive Model ◽  
Rheological Behavior ◽  
Cellular Structure ◽  
High Performance ◽  
Poly Lactic Acid ◽  
Compression Property ◽  
Rigid Particles ◽  
Foaming Behavior

High-performance poly(lactic acid) (PLA) foam has been recognized as a promising material because of its biodegradability. However, low flexibility and foamability of PLAs has limited its use in different fields. In this study, a blend-toughening technology was used to toughen PLA and prepare flexible foams. The mechanical properties of PLA blends were evaluated, and the cellular structure of these foaming blends was characterized. The results show that the blending components significantly affected the overall mechanical properties and foaming behavior of PLA. The toughness of PLA was enhanced by adding poly(butylene adipate- co-terephthalate) (PBAT) and rigid particles. The rheological behavior of PLA was also affected by adding PBAT. Therefore, the cellular structure of the PLA foams was affected. A constitutive model was also used to fit the experimental results of the compression property of the PLA foam.

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