Relationship between cell morphology and impact strength of microcellular foamed high‐density polyethylene/polypropylene blends

Rachtanapun, Pornchai; Selke, Susan; Matuana, Laurent M.

doi:10.1002/pen.20152

Cited by 126 publications

(100 citation statements)

References 23 publications

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“…[1][2][3][4] The performance of these foams and, therefore, their potential applications, are strongly related not only to the physicochemical properties of the polymeric matrix, such as thermomechanical properties, crystallinity, or biocompatibility, but also to their porous structure. The porous structure concerns porosity, pore size, orientation, degree of interconnection, and spatial distribution, [5][6][7][8][9][10] which may be designed through fabrication techniques and processing conditions.…”

Section: Introductionmentioning

confidence: 99%

Open‐Pore Biodegradable Foams Prepared via Gas Foaming and Microparticulate Templating

Salerno

Iannace

Netti

2008

Macromolecular Bioscience

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Open-pore biodegradable foams with controlled porous architectures were prepared by combining gas foaming and microparticulate templating. Microparticulate composites of poly(epsilon-caprolactone) (PCL) and micrometric sodium chloride particles (NaCl), in concentrations ranging from 70/30 to 20/80 wt.-% of PCL/NaCl were melt-mixed and gas-foamed using carbon dioxide as physical blowing agent. The effects of microparticle concentration, foaming temperature, and pressure drop rate on foam microstructure were surveyed and related to the viscoelastic properties of the polymer/microparticle composite melt. Results showed that foams with open-pore networks can be obtained and that porosity, pore size, and interconnectivity may be finely modulated by optimizing the processing parameters. Furthermore, the ability to obtain a spatial gradient of porosity embossed within the three-dimensional polymer structure was exploited by using a heterogeneous microparticle filling. Results indicated that by foaming composites with microparticle concentration gradients, it was also possible to control the porosity and pore-size spatial distribution of the open-pore PCL foams.

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Section: Introductionmentioning

confidence: 99%

Open‐Pore Biodegradable Foams Prepared via Gas Foaming and Microparticulate Templating

Salerno

Iannace

Netti

2008

Macromolecular Bioscience

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“…3,4 Third, when it comes to blending of PP with PE, the crystallinity of PP may slightly decrease as the ethylene component increases. 5,6 Finally, it is possible to achieve wider processing windows using alternative PP molecular architectures. 7 Recently, Yu et al 9 evaluated the foamability of PP with nitrogen as the blowing agent in a batch process, studying four kinds of PP with different molecular architectures using a self-designed compression-molding apparatus.…”

mentioning

confidence: 99%

Influence of the Injection‐Molding Parameters on the Cellular Structure and Thermo‐Mechanical Properties of Ethylene‐Propylene Block Copolymer Foams

Gómez¹,

Arencón²,

Sánchez‐Soto³

et al. 2012

Adv Polym Technol

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Microcellular injection-molding technology is capable of producing lightweight polymeric products. The foam morphology is determined by the injection-molding parameters, and it has been observed that depending on the parameter variations, the cell structure may exhibit substantial morphological differences through the entire section along the melt flow direction of the injected INJECTED ETHYLENE-PROPYLENE BLOCK COPOLYMER FOAMSpart. The effects of varying injection-molding parameters on foam morphology and thermal mechanical properties of a multiphase ethylene-propylene block copolymer (EPBC) were tested on 5-mm plaque specimens using a constant temperature profile. It has been found that injection speed does not have a significant effect on the thermal-mechanical properties of the foam, whereas shot volume and mold temperature do have a significant influence. Low shot volume produces uniform density cellular structures and larger cores, whereas lower mold temperatures help maintain small cell sizes. Furthermore, the effect of the copolymer's crystalline phase on foam morphology has been observed. This study identifies the achievable foam morphologies and the thermal-mechanical performance of cellular molded EPBC parts. C 2012 Wiley Periodicals, Inc. Adv Polym Techn 00: 1-13, 2012; View this article online at wileyonlinelibrary.com.

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“…This blend thus exists as a two-phase mixture in which PP is heterogeneously dispersed in the continuous PE matrix [16]. The poor interfacial bond strength between both phases could, therefore, explain the inferior mechanical properties of these blends [17]. FTIR scans can be used to estimate the PP content of both virgin and recycled HDPE blends.…”

Section: Chemical Propertiesmentioning

confidence: 99%

Mechanical properties and molecular structures of virgin and recycled HDPE polymers used in gravity sewer systems

et al. 2015

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a b s t r a c tThe widespread use of plastics in the conditioning, packaging and building material sectors generates an enormous amount of industrial waste which could be recycled for wastewater pipes and fittings. Nevertheless, current manufacturing standards in the piping industry recommend against the use of post-consumer recycled materialsda policy based on inadequate understanding of the properties and long-term mechanical performance of recycled materials. The present study compared the material characteristics of virgin and recycled high-density polyethylene (HDPE) plastics commonly found in the piping industry. Mechanical testing, oxidative induction time (OIT), melt flow index (MFI) and thermal analysis were used in conjunction with X-ray fluorescence (m-XRF), size exclusion chromatography and 13 C solid-state NMR to evaluate mechanical behavior and molecular structure as well as contaminant or filler contents. This study provides evidence for the degradation processes impact that can occur when post-industrial and post-consumer polymers are recycled. However, the study identified two measures to improve the material qualities of post-consumer recycled HDPE: 1) reducing the amount of contaminants or, alternatively, improving their compatibility with HDPE resins, and 2) improving current sorting and recycling processes to increase the amount of tie molecules in HDPE materials.

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Relationship between cell morphology and impact strength of microcellular foamed high‐density polyethylene/polypropylene blends

Cited by 126 publications

References 23 publications

Open‐Pore Biodegradable Foams Prepared via Gas Foaming and Microparticulate Templating

Open‐Pore Biodegradable Foams Prepared via Gas Foaming and Microparticulate Templating

Influence of the Injection‐Molding Parameters on the Cellular Structure and Thermo‐Mechanical Properties of Ethylene‐Propylene Block Copolymer Foams

Mechanical properties and molecular structures of virgin and recycled HDPE polymers used in gravity sewer systems

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