Impact Strength of High Density Solid-State Microcellular Polycarbonate Foams

2000 ◽  
Vol 123 (2) ◽  
pp. 229-233 ◽  
Author(s):  
Chris Barlow ◽  
Vipin Kumar ◽  
Brian Flinn ◽  
Rajendra K. Bordia ◽  
John Weller
Keyword(s):  
Solid State ◽  
Impact Strength ◽  
Cell Size ◽  
High Density ◽  
Gas Content ◽  
Impact Behavior ◽  
Strong Function ◽  
Impact Tests ◽  
Izod Impact ◽  
The Impact

The effect of density (relative densities 0.33 to 0.90) on the impact behavior of microcellular polycarbonate (PC) was investigated. Cell size and foaming gas content were also considered. Flexed-beam Izod impact tests were conducted and the impact strength of these foams appears to be a strong function of both density and cell size. The impact strength was observed to improve over the unprocessed polycarbonate’s impact strength for foams with relative densities of 60 percent and above. In terms of cell size, the impact strength increased with increasing cell size at a given density.

Evaluation of the Aging Behavior of High Density Polyethylene in Thermal Oxidative Environment by Principal Component Analysis

2017 ◽  
Vol 727 ◽  
pp. 447-449 ◽  
Author(s):  
Jun Dai ◽  
Hua Yan ◽  
Jian Jian Yang ◽  
Jun Jun Guo
Keyword(s):  
Principal Component Analysis ◽  
Impact Strength ◽  
High Density Polyethylene ◽  
Tensile Modulus ◽  
Principal Component ◽  
Component Analysis ◽  
High Density ◽  
Aging Behavior ◽  
Data Set ◽  
The Impact

To evaluate the aging behavior of high density polyethylene (HDPE) under an artificial accelerated environment, principal component analysis (PCA) was used to establish a non-dimensional expression Z from a data set of multiple degradation parameters of HDPE. In this study, HDPE samples were exposed to the accelerated thermal oxidative environment for different time intervals up to 64 days. The results showed that the combined evaluating parameter Z was characterized by three-stage changes. The combined evaluating parameter Z increased quickly in the first 16 days of exposure and then leveled off. After 40 days, it began to increase again. Among the 10 degradation parameters, branching degree, carbonyl index and hydroxyl index are strongly associated. The tensile modulus is highly correlated with the impact strength. The tensile strength, tensile modulus and impact strength are negatively correlated with the crystallinity.

scholarly journals Low-Temperature Mechanical Properties of High-Density and Low-Density Polyethylene and Their Blends

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1821
Author(s):  
Ildar I. Salakhov ◽  
Nadim M. Shaidullin ◽  
Anatoly E. Chalykh ◽  
Mikhail A. Matsko ◽  
Alexey V. Shapagin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Impact Strength ◽  
Relative Elongation ◽  
High Density ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Elongation At Break ◽  
Subzero Temperatures ◽  
Izod Impact

Low-temperature properties of high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and their blends were studied. The analyzed low-temperature mechanical properties involve the deformation resistance and impact strength characteristics. HDPE is a bimodal ethylene/1-hexene copolymer; LDPE is a branched ethylene homopolymer containing short-chain branches of different length; LLDPE is a binary ethylene/1-butene copolymer and an ethylene/1-butene/1-hexene terpolymer. The samples of copolymers and their blends were studied by gel permeation chromatography (GPC), differential scanning calorimetry (DSC), 13С NMR spectroscopy, and dynamic mechanical analysis (DMA) using testing machines equipped with a cryochamber. It is proposed that such parameters as “relative elongation at break at −45 °C” and “Izod impact strength at −40 °C” are used instead of the ductile-to-brittle transition temperature to assess frost resistance properties because these parameters are more sensitive to deformation and impact at subzero temperatures for HDPE. LLDPE is shown to exhibit higher relative elongation at break at −45 °C and Izod impact strength at −20 ÷ 60 °C compared to those of LDPE. LLDPE terpolymer added to HDPE (at a content ≥ 25 wt.%) simultaneously increases flow properties and improves tensile properties of the blend at −45 °C. Changes in low-temperature properties as a function of molecular weight, MWD, crystallinity, and branch content were determined for HDPE, LLDPE, and their blends. The DMA data prove the resulting dependences. The reported findings allow one to understand and predict mechanical properties in the HDPE–LLDPE systems at subzero temperatures.

Effect of inorganic nanofillers on the impact behavior and fracture probability of industrial high-density polyethylene nanocomposite

2017 ◽  
Vol 52 (18) ◽  
pp. 2431-2442 ◽  
Author(s):  
Harun Sepet ◽  
Necmettin Tarakcioglu ◽  
RDK Misra
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Density Polyethylene ◽  
Fracture Probability ◽  
High Density ◽  
Impact Behavior ◽  
Inorganic Filler ◽  
Melt Mixing ◽  
The Impact ◽  
Scanning Electron

The main purpose of this work is to study how the morphology of nanofillers and dispersion and distribution level of inorganic nanofiller influence the impact behavior and fracture probability of inorganic filler filled industrial high-density polyethylene nanocomposites. For this study, nanoclay and nano-CaCO3 fillers–high-density polyethylene mixings (0, 1, 3, 5 wt.% high-density polyethylene) was prepared by melt-mixing method using a compounder system. The impact behavior was examined by charpy impact test, scanning electron microscopy, and probability theory and statistics. The level of the dispersion was characterized with scanning electron microscopy energy dispersive X-ray spectroscopy analysis. The results showed rather good dispersion of both of inorganic nanofiller, with a mixture of exfoliated and confined morphology. The results indicated that the impact strength of the industrial nanocomposite decreased with the increase of inorganic particulate content. The impact reliability of the industrial nanocomposites depends on the type of nanofillers and their dispersion and distribution in the matrix.

scholarly journals Effect of In-Situ Synthesized Boride Phases on the Impact Behavior of Iron-Based Composites Reinforced by B4C Particles

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 554
Author(s):  
Fehmi Nair ◽  
Mustafa Hamamcı
Keyword(s):  
Contact Forces ◽  
Impact Behavior ◽  
Iron Matrix ◽  
Impact Tests ◽  
B4c Particles ◽  
Iron Based ◽  
In Situ Reactions ◽  
Boride Phases ◽  
The Impact

The objective of this study is to investigate the impact behavior of iron-based composites reinforced with boron carbide (B4C) particles and in-situ synthesized iron borides (Fe2B/FeB). The composite specimens (Fe/B4C) were fabricated by hot-pressing under a pressure of 250 MPa at 500 °C, and sintered at a temperature of 1000 °C. The effects of the reinforcement ratio on the formation of in-situ borides and impact behavior were investigated by means of different volume fractions of B4C inside the iron matrix: 0% (un-reinforced), 5%, 10%, 20%, and 30%. Drop-weight impact tests were performed by an instrumented Charpy impactor on reinforced and un-reinforced test specimens. The results of the impact tests were supported with microstructural and fractographical analysis. As a result of in-situ reactions between the Fe matrix and B4C particles, Fe2B phases were formed in the iron matrix. The iron borides, formed in the iron matrix during sintering, heavily affected the hardness and the morphology of the fractured surface. Due to the high amount of B4C (over 10%), porosity played a major role in decreasing the contact forces and fracture energy. The results showed that the in-situ synthesized iron boride phases affect the impact properties of the Fe/B4C composites.

scholarly journals Effect of Mold Temperature on the Impact Behavior and Morphology of Injection Molded Foams Based on Polypropylene Polyethylene–Octene Copolymer Blends

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 894 ◽  
Author(s):  
Santiago Muñoz-Pascual ◽  
Eduardo Lopez-Gonzalez ◽  
Cristina Saiz-Arroyo ◽  
Miguel Angel Rodriguez-Perez
Keyword(s):  
Impact Resistance ◽  
Mold Temperature ◽  
Impact Behavior ◽  
Critical Parameters ◽  
Crystalline Morphology ◽  
Copolymer Blends ◽  
Opposite Trend ◽  
Izod Impact ◽  
Injection Molded ◽  
The Impact

In this work, an isotactic polypropylene (PP) and a polyethylene–octene copolymer (POE) have been blended and injection-molded, obtaining solids and foamed samples with a relative density of 0.76. Different mold temperature and injection temperature were used. The Izod impact strength was measured. For solids, higher mold temperature increased the impact resistance, whereas in foams, the opposite trend was observed. In order to understand the reasons of this behavior, the morphology of the elastomeric phase, the crystalline morphology and the cellular structure have been studied. The presence of the elastomer near the skin in the case of high mold temperature can explain the improvement produced with a high mold temperature in solids. For foams, aspects as the elastomer coarsening in the core of the sample or the presence of a thicker solid skin are the critical parameters that justify the improved behavior of the materials produced with a lower mold temperature.

Impact Strength of Laminated Floor Panel from Kenaf (Hibiscus cannabinus) High Density Fibreboard

2015 ◽  
Vol 799-800 ◽  
pp. 201-204
Author(s):  
Mansur Ahmad ◽  
Nurul Nadia Mohd Khairuddin ◽  
Nurul Atiqah Mohd Ayob
Keyword(s):  
Surface Layer ◽  
Impact Strength ◽  
High Density ◽  
Hibiscus Cannabinus ◽  
Floor Panel ◽  
Kenaf Bast ◽  
The Impact

This study provides a better understanding of the effect of density and thickness on impact strength of laminated floor panel from Kenaf high density fibreboard (KHDF). The objective of this study was therefore to determine the role of density and thickness on the impact strength of laminated floor panel. Laminated floor panels consisted of high density fibreboard (HDF) as core and decorative paper as surface layer and backing. Kenaf bast fibres were used for HDF with three different densities (850, 960 and 1000 kg/m3) with thickness of 8mm and 12mm for each panel. Energy (J) value was evaluated to determine the impact strength of all various floor panels. It was found that thickness has affected statistically on impact strength while there was no significantly difference existed on density of laminated floor panel on impact strength.

Preliminary Study of Development of HDPE/EVA/MMT/EFB Nanohybrid Biocomposite by Using Single Screw Extruder

2014 ◽  
Vol 493 ◽  
pp. 715-720
Author(s):  
Muhammad Syafiq Jainal ◽  
Siti Norsyarahah Che Kamarludin ◽  
Suffiyana Akhbar ◽  
Abdul Rahman Mohd Faizal
Keyword(s):  
Impact Strength ◽  
Ethylene Vinyl Acetate ◽  
Flexural Properties ◽  
Screw Extruder ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Izod Impact ◽  
Preliminary Study ◽  
The Impact ◽  
Further Development

This work study the mechanical properties (tensile, flexural and impact) of four different formulation of HDPE/EVA/MMT nanocomposite with present of 1.5 phr compatibilizer as a preliminary study before further development of HDPE/EVA/MMT/EFB nanohybrid biocomposite. The ethylene vinyl acetate (EVA) was varied from 0, 10, 20 and 30 wt%. Meanwhile the nanoclay montmorillonite (MMT) was varied from 0, 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 phr. HDPE/EVA/MMT ternary blends were prepared by melt extrusion blending technique using a single screw extruder. The result found that in absent of nanoclay MMT, the tensile and flexural properties (strength and modulus) of HDPE/EVA/1.5 phr compatibilizer were decreased as EVA amount are increased. Meanwhile in absent of EVA gave the highest tensile and flexural strength which are 38.53 MPa and 35.02 MPa respectively. However the trend is reciprocal for impact strength. The Izod impact test found that 30 wt% EVA give the highest impact strength which is 103.88 J/m , followed by 20 wt% EVA, 10wt % EVA and 0 wt% EVA which are 59.91 J/m, 38.11 J/m and 30.63 J/m respectively. This is because EVA plays a role as impact modifier. Meanwhile incorporation of nanoclay MMT improved the tensile and flexural properties but reducing the impact properties.

scholarly journals Effects of gamma radiation on the impact strength of polypropylene (PP)/high density polyethylene (HDPE) blends

2019 ◽  
Vol 12 ◽  
pp. 2169-2174 ◽  
Author(s):  
Wenzhao Wang ◽  
Xiaochao Zhang ◽  
Zongyuan Mao ◽  
Weiquan Zhao
Keyword(s):  
Impact Strength ◽  
Gamma Radiation ◽  
High Density Polyethylene ◽  
High Density ◽  
The Impact

Study on the Influence of Processing Condition on Impact Property of Injection-Molded Polycarbonate

2012 ◽  
Vol 151 ◽  
pp. 135-138
Author(s):  
Ying Hui Shang ◽  
Bo Wang ◽  
Fang Fang Wang ◽  
Zhi Xin Wang ◽  
Chun Tai Liu
Keyword(s):  
Thermal Treatment ◽  
Impact Strength ◽  
Injection Molding ◽  
Processing Condition ◽  
Impact Property ◽  
Impact Tests ◽  
Injection Molded ◽  
Plastic Components ◽  
Injection Molded Plastic ◽  
The Impact

The impact property of injection-molded plastic components is an important factor to judge their quality. The aim of this paper is to study the effects of processing conition on impact property of injection-molded polycarbonate (PC). By changing the processing conitions such as injection molding parameters and thermal treatment, different impact samples were acquired. Then, Izod and Charpy notch impact tests were carried out to research the relation between the impact strength and the prcessing conditions. The results imply that different processing conitions will lead to different changes of impact property.

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