Evaluation of the effect of processing conditions on the impact properties of polypropylene-nano-CaCO3 composites

2017 ◽  
Vol 51 (24) ◽  
pp. 3365-3372 ◽  
Author(s):  
Marisa Cristina Guimarães Rocha ◽  
Gisele Fonseca Moreira ◽  
Antonio Henrique Monteiro Fonseca Thomé da Silva
Keyword(s):  
Response Surface Methodology ◽  
Filler Content ◽  
Rotation Speed ◽  
Impact Resistance ◽  
Significant Loss ◽  
Processing Conditions ◽  
Impact Properties ◽  
Polypropylene Composites ◽  
Processing Variables ◽  
The Impact

Processing variables are known to have a decisive influence on the impact properties of polypopylene-nano-CaCO3 composites. Therefore, it becomes mandatory to evaluate the effect of extrusion conditions on composite impact resistance. In the present work, a response surface methodology was used to evaluate the effects of screw rotation speed, screw configuration, and nanoparticles content on the polypropylene impact properties. The concentration of the nano-CaCO3 particles, the screw rotation speed, and the interaction between these entrance factors were the processing variables of greater influence on the impact properties of nano-CaCO3/polypropylene composites. The increase of screw rotation speed led to a decrease in the impact resistance, while the increase of filler content promoted an increase of such property. However, the increase of nanoparticles content led to obtaining poor tensile properties. Therefore, the filler content has to be adjusted in order to improve the impact properties without significant loss of mechanical strength.

Effect of Alkali Treatment and Molding Temperature on Flexural and Impact Properties of Coir-Fibre-Epoxy Composite

2015 ◽  
Vol 24 (4) ◽  
pp. 096369351502400
Author(s):  
C. K. Tai ◽  
R. Ahmad ◽  
H. M. Akil ◽  
M. M. Ratnam
Keyword(s):  
Room Temperature ◽  
Alkali Treatment ◽  
Flexural Modulus ◽  
Impact Resistance ◽  
Compression Molding ◽  
Impact Properties ◽  
Molding Temperature ◽  
Coir Fibre ◽  
Fibre Composites ◽  
The Impact

The combined effects of alkali treatment and compression molding temperature on the flexural strength and impact resistance of woven coir fibre composites are investigated. Ten pieces of composites plates made from single-layer woven coir fibre fabricated under different process parameters were used in the study. Five pieces of the coir woven fibre were treated with 6% sodium hydroxide (NaOH) solution while another five were left untreated. The compression molding temperature were varied between room temperature (25°C), 50°C, 75°C, 100°C and 125°C. The flexural properties of the composite were evaluated using the three-point flexural test, while the impact resistance was investigated by drop weight impact tests using a specially designed indenter. The indentation radius on each test specimen was measured using a 3-D metrology system and the depth of indentation was determined from the geometry of the indenter. The results show that the maximum flexural load to failure is improved by 38.9% when the fibres were treated and the compression molding temperature is increased to 125°C. The flexural modulus generally decreased with increase in the molding temperature. The depth of indentation in the treated coir woven composites is lower than that of untreated fibre composite at all molding temperatures. The impact resistance of both untreated and treated fibre composites decreased with the increase in the compression molding temperature. Composites fabricated by molding at room temperature, 50°C and 75°C using treated fibre produced the best impact properties.

Morphological, mechanical, and thermal properties of PP/SEBS/talc composites

2019 ◽  
pp. 089270571987667 ◽  
Author(s):  
Carlos Ivan Ribeiro de Oliveira ◽  
Marisa Cristina Guimarães Rocha ◽  
Joaquim Teixeira de Assis ◽  
Ana Lúcia Nazareth da Silva
Keyword(s):  
Thermal Properties ◽  
Impact Resistance ◽  
Mechanical And Thermal Properties ◽  
Processing Conditions ◽  
Screw Extruder ◽  
Crystallinity Degree ◽  
Twin Screw ◽  
The Impact ◽  
Scanning Electron ◽  
Nucleating Effect

The aim of this study is to evaluate the effect of some experimental variables such as the content of styrene–ethylene–butylene–styrene (SEBS) and talc, processing conditions and mixing protocol on the properties of polypropylene (PP). To achieve this objective, PP/SEBS blends and PP/SEBS/talc composites were processed in a corotating twin-screw extruder. A masterbatch of PP/talc was prepared before the extrusion of PP/SEBS/talc composites. The morphology of blends and composites was evaluated by scanning electron microscopy, which revealed the dispersion of small rubber droplets in the PP matrix. Moreover, the micrographs also showed that SEBS and talc particles were uniformly dispersed and distributed in the polymer matrix. Results of thermal properties showed that talc had a nucleating effect, which promoted the increase of both PP crystallization temperature and crystallinity degree. The incorporation of talc in PP/SEBS blends led to an expressive increase in the impact resistance by 70% as compared with the reference blend: PP/SEBS 80/20% (w/w). This result reveals that although the PP/SEBS/talc composites showed a separated morphology, the good dispersion and distribution of this mineral filler in the polymers contributed to avoid crack propagation and increase the impact properties. The tensile properties in the elastic region were not significantly affected.

scholarly journals Study on Foaming Quality and Impact Property of Foamed Polypropylene Composites

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1375 ◽  
Author(s):  
Wei Gong ◽  
Hai Fu ◽  
Chun Zhang ◽  
Daming Ban ◽  
Xiaogang Yin ◽  
...  
Keyword(s):  
Low Temperature ◽  
Impact Property ◽  
Impact Properties ◽  
Polypropylene Composites ◽  
Polyolefin Elastomer ◽  
Pp Composites ◽  
The Impact ◽  
Foaming Technology ◽  
Thermoplastic Rubber

In the present work, foamed polypropylene (PP) composites were prepared by chemical foaming technology, and the foaming quality and impact property of the foamed PP composites were studied. The results showed that the foaming quality was significantly improved after the introduction of thermoplastic rubber (TPR) and polyolefin elastomer (POE). Meanwhile, it was found that the impact property depended on the intrinsic toughness and contribution of foams (cells) to the PP composites. Furthermore, the data regarding impact property in low temperature showed that when the temperature was between −80 and −20 °C, the impact properties of the foamed PP composites were higher than that of the unfoamed sample, which was due to the impact property being completely contributed by cells under this condition. Meanwhile, when the temperature ranged from −20 to 20 °C, the impact property of the unfoamed sample was higher, which was due to the PP matrix contributing more to the impact property under this temperature. This work significantly improved the foaming quality of foamed PP composites and provided reliable evidence for the improvement of impact property.

scholarly journals Improvement of the impact resistance of natural fiber–reinforced polypropylene composites through hybridization

2021 ◽  
Author(s):  
Róbert Várdai ◽  
Thomas Lummerstorfer ◽  
Claudia Pretschuh ◽  
Michael Jerabek ◽  
Markus Gahleitner ◽  
...  
Keyword(s):  
Natural Fiber ◽  
Impact Resistance ◽  
Fiber Reinforced ◽  
Polypropylene Composites ◽  
The Impact

scholarly journals Shape Memory Alloy Hybrid Composites for Improving Impact Properties

2021 ◽  
pp. X
Author(s):  
Chuanliang SHEN ◽  
Xiaodong XU ◽  
Xiaoyu MA ◽  
Yibo HU ◽  
Shan ZHANG ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Composite Plate ◽  
Hybrid Composites ◽  
Mechanical Energy ◽  
Impact Resistance ◽  
Composite Plates ◽  
Impact Response ◽  
Impact Properties ◽  
The Impact

This paper investigates the method to improve the property that can decrease the impact response of composite plate. Embedding the super-elastic shape memory alloy wires into composite plates has increased the attention of material researchers. Super-elastic shape memory alloy has the properties of absorbing mechanical energy, large recoverable deformation and so on. In this study, experiments were conducted to analyze the impact properties of composite plates with Ni-Ti SMA wires. Composite plates with Ni-Ti SMA wires and without Ni-Ti SMA wires were subjected to two impacts respectively. This study measured the responses of two impacts. The results showed that the composite plate with Ni-Ti SMA wires were subjected to a second impact with a peak deflection of 5.47 mm, which was only 0.22 mm larger than the first impact. The relevant data of the composite plate without Ni-Ti SMA wires were 9.02 mm, 1.22 mm, and serious damage occurred. It was verified that the Ni-Ti SMA wires improved the impact resistance of the composite plate. After studying the impact tests of variable diameters of SMA wires embedded at the low layer of composite plate, it was shown that as the diameter of SMA wires increased, the impact resistance of composite plates was improved.

scholarly journals Tribological and mechanical properties of polyamide-11/halloysite nanotube nanocomposites

2018 ◽  
Vol 39 (1) ◽  
pp. 25-34 ◽  
Author(s):  
Mohamed Sahnoune ◽  
Mustapha Kaci ◽  
Aurélie Taguet ◽  
Karl Delbé ◽  
Samir Mouffok ◽  
...  
Keyword(s):  
Filler Content ◽  
Processing Conditions ◽  
Optical Profilometry ◽  
Halloysite Nanotube ◽  
Elongation At Break ◽  
Polyamide 11 ◽  
Wear Process ◽  
Melt Compounding ◽  
The Impact ◽  
Scanning Electron

AbstractThis article reports some morphological, tribological, and mechanical data on polyamide-11(PA11)/halloysite nanotube (HNT) nanocomposites prepared by melt-compounding. HNTs extracted from the Djebel Debbagh deposit in Algeria were incorporated into the polymer at 1, 3, and 5 wt%. For comparison, commercial HNTs were also used under the same processing conditions. Scanning electron microscopy showed that both HNTs were homogeneously dispersed in the PA11 matrix, despite the presence of few aggregates, in particular at higher filler contents. The tribological properties were significantly improved, resulting in a decrease in the friction coefficient and the wear rate characteristics due to the lubricating effect of HNTs. This is consistent with optical profilometry data, which evidenced the impact of both types of HNTs on the surface topography of the nanocomposite samples, in which the main wear process was plastic deformation. Furthermore, Young’s modulus and tensile strength were observed to increase with the filler content, but to the detriment of elongation at break and impact strength. Regarding the whole data, the raw Algerian halloysite led to interesting results in PA11 nanocomposites, thus revealing its potential in polymer engineering nanotechnology.

Impact Resistance and Shore Hardness of Barkcloth Reinforced Epoxy Composites for Interior Automotive Panels

2019 ◽  
Vol 951 ◽  
pp. 9-13
Author(s):  
Samson Rwahwire ◽  
Wilson Babu Musinguzi
Keyword(s):  
Natural Fiber ◽  
Impact Resistance ◽  
Ghg Emissions ◽  
Woven Fabric ◽  
Shore Hardness ◽  
Impact Properties ◽  
Naturally Occurring ◽  
Eu Directives ◽  
Automotive Panels ◽  
The Impact

The global impact of the consequences of climate change due to an increase in Green House Gas (GHG) emissions are visible. With the implementation of EU directives on waste and end of life disposal strategies, there has been a surge of activity driven by the European automotive industry to introduce Natural Fiber Composites as a substitute to synthetic composites, where appropriate. This paper therefore reports the impact and shore hardness of composites reinforced with a naturally occurring non-woven fabric barkcloth. The composites were produced using a layering architecture; the impact properties show that samples with layering sequence I and IV had the best sequence for the impact properties. The shore hardness of the composites was 72 which is presentable. This further confirms the potential of barkcloth reinforced composites for interior automotive panels.

Analysis of Erosion Wear Behavior of LD Sludge Filled Polypropylene Composites Using RSM

2020 ◽  
Vol 978 ◽  
pp. 222-228
Author(s):  
Abhilash Purohit ◽  
Alok Satapathy ◽  
Priyadarshi Tapas Ranjan Swain
Keyword(s):  
Mechanical Characterization ◽  
Filler Content ◽  
Wear Behavior ◽  
Filler Loading ◽  
Wear Behaviour ◽  
Erosion Wear ◽  
Polypropylene Composites ◽  
The Impact ◽  
Composite Samples

In the current investigation, a large number of experimental data are created for a set of Linz-Donawitz (LD) sludge filled polypropylene composites by fabricating them through compression molding technique and by conducting different tests to find out their physical, mechanical and erosion wear behaviour under controlled laboratory conditions. The erosion wear trials are carried out on the fabricated polypropylene-LD sludge composite samples as per ASTM standard using response surface methodology (RSM). This study discloses that the impact velocity and the filler content are the most predominant factors influencing the erosion rate of the composite. Mechanical characterization of the composites under this investigation reveals that the trends observed in regard to the compressive strengths are quite different from those obtained in the case of tensile strength variations with the filler loading. It is also observed that these LD sludge filled composites show improved micro-hardness and low amount of porosity.

scholarly journals Tensile and impact properties of pulverized oil palm fiber reinforced polypropylene composites : A comparison study with wood fiber reinforced polypropylene composites

2018 ◽  
Vol 12 (4) ◽  
pp. 4191-4202
Author(s):  
M. N. A. Nordin ◽  
K. Sakamoto ◽  
H. Azhari ◽  
K. Goda ◽  
M. Okamoto ◽  
...  
Keyword(s):  
Oil Palm ◽  
Wood Fiber ◽  
Impact Resistance ◽  
Fiber Reinforced ◽  
Impact Properties ◽  
Palm Fiber ◽  
Polypropylene Composites ◽  
Maleated Polypropylene ◽  
Pp Composites ◽  
Tensile Test Result

In this study, the Malaysian oil palm fiber (OPF) was extracted from empty fruit bunch (EFB) and used as a reinforcement of polymer composite materials. 10 wt.% and 25 wt.% of OPF were incorporated with polypropylene (PP) and maleated polypropylene (MAPP) to produce injection-molded composite material. For comparison purpose, virgin PP and polymer composites reinforced with wood fiber (WPC) were also fabricated as benchmark samples. From the tensile test result of 25 wt.% of fiber loading, it produced higher tensile properties of the composites. Moreover, the obtained OPF/PP composites showed comparable properties with the WPC material. The second objective of this study is to investigate the effect of fiber sizes on tensile and impact properties of both WPC and OPF/PP composite. The wood fiber and OPF were mechanically classified into several size ranges by using different mesh sieves and proceeded with the kneading and injection molding. The tensile and impact tests were carried out for each type of sample in order to verify the influence of fiber size on the tensile and impact resistance behavior of the WPC and OPF/PP composites.

Sign in / Sign up

Export Citation Format

Share Document