Impact toughening of polycarbonate by microcellular foaming

Collias, Dimitris I.; Baird, Donald G.; Borggreve, R.J.M.

doi:10.1016/0032-3861(94)90283-6

Cited by 170 publications

(108 citation statements)

References 8 publications

Supporting

Mentioning

102

Contrasting

Order By: Relevance

“…0.79), considering the diversity in foams characteristics and properties: semi-crystalline and amorphous polymeric In light of the success of this approach, some general guidelines for foam processing might be suggested. The first is that the properties of Impact-Compression-Morphology Relationship foams could be optimized by using the power-law regressions proposed in Equations (3) and (4). Foam properties at a given density could be enhanced by a reduction of the average cell size, or properties could be maintained at a lower density by reducing the cell size, to keep the microstructural parameter /d constant.…”

Section: Discussionmentioning

confidence: 99%

“…Equations (3) and (4) suggest that the mechanical 74 M. N. BUREAU ET AL performance of a foam could be maintained at a lower density by decreasing its average cell size, or inversely that improved mechanical performance should be anticipated with smaller average cell size. Such a result could represent obvious economic advantages and supports to some extent claims related to microcellular foams (MCFs) [4]. While good agreement was observed for PS foams, the proposed methodology to relate mechanical properties and microstructure of foams with a microstructural parameter /d requires validation for other materials, and over a wider range of densities.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact-Compression-Morphology Relationship in Polyolefin Foams

Bureau

Champagne

Gendron

2005

Journal of Cellular Plastics

View full text Add to dashboard Cite

The relationship between the morphology and the mechanical properties of polyethylene (PE) foams has been studied. Experiments have been made on closed cell low density foams at low testing speed as well as in impact conditions. A careful characterization of the cell size distribution and anisotropy was performed and related to the foams mechanical response. The results indicate that the mechanical response of the foams is anisotropic and can be expressed as a function of the foam morphology, using a unique morphological parameter taking into account the cell size in the appropriate direction and foam density. Previously developed for polystyrene foams, the use of this parameter is thus successfully extended to PE-based foams.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact-Compression-Morphology Relationship in Polyolefin Foams

Bureau

Champagne

Gendron

2005

Journal of Cellular Plastics

View full text Add to dashboard Cite

show abstract

“…Polypropylene (pellet, isotactic, homopolymer) T30s, with a density of 0.91 g/cm 3 and a melt flow index of 3.0 g/10 min at 230 °C with a weight of 2.16 kg [16], was purchased from Sinopec Shanghai Chemical Co. (Shanghai, China). Triallylisocyanurate (TAIC, C12H15N3O3), with an average molecular weight of 249.27 g/mol and a density of 1.11 g/cm 3 , was purchased from Shanghai Farida Chemical Co., Ltd. (Shanghai, China).…”

Section: Methodsmentioning

confidence: 99%

“…Triallylisocyanurate (TAIC, C12H15N3O3), with an average molecular weight of 249.27 g/mol and a density of 1.11 g/cm 3 , was purchased from Shanghai Farida Chemical Co., Ltd. (Shanghai, China). Carbon dioxide with a purity of 99.5% was supplied by Xiang Kun Special Gases of Shanghai (Shanghai, China).…”

Section: Methodsmentioning

confidence: 99%

“…Polypropylene (PP) foam has been considered as a substitute for other thermoplastic foams, as its mechanical properties are enhanced; these include increased toughness, impact strength, stiffness-to-weight ratio, fatigue life, and thermal stability, as well as its relatively high service temperature [1][2][3][4][5][6]. PP foam has been used in electronic packaging, food packaging, construction materials, traffic equipment, sports equipment, and thermal and sound insulators.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Supercritical CO2 Foaming of Radiation Cross-Linked Isotactic Polypropylene in the Presence of TAIC

et al. 2016

View full text Add to dashboard Cite

Abstract:Since the maximum foaming temperature window is only about 4 • C for supercritical CO 2 (scCO 2 ) foaming of pristine polypropylene, it is important to raise the melt strength of polypropylene in order to more easily achieve scCO 2 foaming. In this work, radiation cross-linked isotactic polypropylene, assisted by the addition of a polyfunctional monomer (triallylisocyanurate, TAIC), was employed in the scCO 2 foaming process in order to understand the benefits of radiation cross-linking. Due to significantly enhanced melt strength and the decreased degree of crystallinity caused by cross-linking, the scCO 2 foaming behavior of polypropylene was dramatically changed. The cell size distribution, cell diameter, cell density, volume expansion ratio, and foaming rate of radiation-cross-linked polypropylene under different foaming conditions were analyzed and compared. It was found that radiation cross-linking favors the foamability and formation of well-defined cell structures. The optimal absorbed dose with the addition of 2 wt % TAIC was 30 kGy. Additionally, the foaming temperature window was expanded to about 8 • C, making the handling of scCO 2 foaming of isotactic polypropylene much easier.

show abstract

Microcellular Plastics

Wong

Guo

Kumar

et al. 2016

Encyclopedia of Polymer Science and Technology

View full text Add to dashboard Cite

Microcellular plastics are typically thermoplastic polymers with a large number (∼billions per cm3) of tiny bubbles (of the order of 10 μm in diameter). Their densities can range from 3% to 95% of the solid polymer depending on the volume taken by the bubbles (which are denoted as cells in this paper). In general, microcellular plastics exhibit superior impact strength, toughness, fatigue life, thermal stability, dielectric strength, thermal and acoustical insulation performance, as well as optical properties, relatively to the solid counterparts. Other advantages of microcellular plastics include higher productivity due to its faster processing times and sink‐mark free injection‐molded parts with no residual stress and high dimensional stability. Owing to these unique properties, there are a large number of applications of microcellular plastics, particularly in automotive industries. This article summarizes the science and technology of microcellular plastics. To be specific, their history, science (ie, generation of polymer–gas solution, cell nucleation, growth, deterioration and stabilization), solid‐state processing technologies, continuous processing technologies (ie, extrusion and injection molding), design guidelines of each processing technologies, as well as the properties and application of microcellular plastics, are discussed in detail.

show abstract

Impact toughening of polycarbonate by microcellular foaming

Cited by 170 publications

References 8 publications

Impact-Compression-Morphology Relationship in Polyolefin Foams

Impact-Compression-Morphology Relationship in Polyolefin Foams

Supercritical CO2 Foaming of Radiation Cross-Linked Isotactic Polypropylene in the Presence of TAIC

Microcellular Plastics

Contact Info

Product

Resources

About