Mechanical Performance of Injection-Molded Poly(propylene): Characterization and Modeling

2012 ◽  
Vol 298 (3) ◽  
pp. 348-358 ◽  
Author(s):  
Tim B. van Erp ◽  
Leon E. Govaert ◽  
Gerrit W. M. Peters
Keyword(s):  
Mechanical Performance ◽  
Injection Molded ◽  
Poly Propylene

scholarly journals 3D-Printable PP/SEBS Thermoplastic Elastomeric Blends: Preparation and Properties

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 347 ◽  
Author(s):  
Shib Banerjee ◽  
Stephen Burbine ◽  
Nischay Kodihalli Shivaprakash ◽  
Joey Mead
Keyword(s):  
3D Printing ◽  
Carbon Black ◽  
Computer Aided Design ◽  
Fused Deposition Modeling ◽  
Mechanical Performance ◽  
Polymeric Materials ◽  
Fused Deposition ◽  
3D Printed ◽  
Injection Molded ◽  
Preferential Location

Currently, material extrusion 3D printing (ME3DP) based on fused deposition modeling (FDM) is considered a highly adaptable and efficient additive manufacturing technique to develop components with complex geometries using computer-aided design. While the 3D printing process for a number of thermoplastic materials using FDM technology has been well demonstrated, there still exists a significant challenge to develop new polymeric materials compatible with ME3DP. The present work reports the development of ME3DP compatible thermoplastic elastomeric (TPE) materials from polypropylene (PP) and styrene-(ethylene-butylene)-styrene (SEBS) block copolymers using a straightforward blending approach, which enables the creation of tailorable materials. Properties of the 3D printed TPEs were compared with traditional injection molded samples. The tensile strength and Young’s modulus of the 3D printed sample were lower than the injection molded samples. However, no significant differences could be found in the melt rheological properties at higher frequency ranges or in the dynamic mechanical behavior. The phase morphologies of the 3D printed and injection molded TPEs were correlated with their respective properties. Reinforcing carbon black was used to increase the mechanical performance of the 3D printed TPE, and the balancing of thermoplastic elastomeric and mechanical properties were achieved at a lower carbon black loading. The preferential location of carbon black in the blend phases was theoretically predicted from wetting parameters. This study was made in order to get an insight to the relationship between morphology and properties of the ME3DP compatible PP/SEBS blends.

scholarly journals Microstructure and Mechanical/Elastic Performance of Biobased Poly (Butylene Furanoate)–Block–Poly (Ethylene Oxide) Copolymers: Effect of the Flexible Segment Length

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 271 ◽  
Author(s):  
Magdalena Kwiatkowska ◽  
Inez Kowalczyk ◽  
Konrad Kwiatkowski ◽  
Agata Zubkiewicz
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Ethylene Oxide ◽  
Mechanical Performance ◽  
Elastic Recovery ◽  
Segment Length ◽  
Poly Ethylene Oxide ◽  
Injection Molded ◽  
Poly Ethylene ◽  
Flexible Segment

The aim of this paper is to extend knowledge on biobased poly(butylene furanoate)–block–poly (ethylene oxide) (PBF-b-PEO) copolymers’ performance by studying the effect of the PEO segment’s molecular weight on the microstructure and materials behavior. As crystallization ability of PEO depends on its molecular weight, the idea was to use two PEO segment lengths, expecting that the longer one would be able to crystallize affecting the phase separation in copolymers, thus affecting their mechanical performance, including elasticity. Two series of PBF-block-PEOs with the PEO segments of 1000 and 2000 g/mol and different PBF/PEO segment ratios were synthesized by polycondensation in melt, injection molded to confirm their processability, and subjected to characterization by NMR, FTIR, DSC, DMTA, WAXS, TGA, and mechanical parameters. Indeed, the PEO2000 segment not only supported the crystallization of the PBF segments in copolymers, but at contents at least 50 wt % is getting crystallizable in the low temperature range, which results in the microstructure development and affects the mechanical properties. While the improvement in the phase separation slightly reduces the copolymers’ ability to deformation, it is beneficial for the elastic recovery of the materials. The investigations were performed on the injection molded samples reflecting the macroscopic properties of the bulk materials.

Processing and Characterization of Palm Fiber-Polypropylene Composites

2011 ◽  
Vol 471-472 ◽  
pp. 145-150
Author(s):  
Ramazan Kahraman ◽  
Sarfraz Abbasi ◽  
Basel Abu-Sharkh
Keyword(s):  
Mechanical Performance ◽  
Mixing Time ◽  
Processing Parameters ◽  
Processing Temperature ◽  
Palm Fiber ◽  
Polypropylene Composites ◽  
Mixing Speed ◽  
Single Screw Extruder ◽  
Injection Molded

Composites of palm fiber and polypropylene were compounded using a mixing device at various temperatures, mixing times, and mixing intensities. Two mixing options were utilized. Either the mixing device was mounted with a mixer or a single screw extruder. The composites were subsequently injection molded into standard tensile specimens for mechanical characterization. Tests were performed to determine the effects of processing parameters such as the mixing and molding temperatures, mixing speed, and mixing time on the mechanical performance of the palm-polypropylene composite. The optimum processing conditions for the mixer were determined to be: Mixing Speed = 50 rpm, Mixing Time = 8 min, and Processing Temperature = 200°C. Optimum extruder conditions, on the other hand, were determined as 40 rpm extruder screw speed and processing temperatures of Zone 1=195°C, Zone 2=200°C, Zone 3=205°C, and Nozzle 210°C. Use of the extruder resulted in higher composite strength with much shorter processing time. Further studies are also being conducted to include coupling agents in the processing to improve the interfacial adhesion between the palm fibers and the polypropylene matrix.

The Effect of Composition and Processing Conditions on the Structure Development in Injection Molded Dynamically Vulcanized PP/EPDM Blends

2000 ◽  
Vol 73 (4) ◽  
pp. 753-778 ◽  
Author(s):  
M. Cakmak ◽  
S. W. Cronin
Keyword(s):  
Flow Direction ◽  
Thin Layers ◽  
Processing Conditions ◽  
Axis Orientation ◽  
X Ray ◽  
X Ray Scattering ◽  
Rubber Particles ◽  
Injection Molded ◽  
Poly Propylene ◽  
Microscopy Techniques

Abstract The effect of composition and processing conditions on the spatial structural variation in dynamically vulcanized injection molded poly(propylene)/ethylene—propylene—diene rubber (PP/EPDM) was investigated using matrixing microbeam X-ray system and transmission optical microscopy techniques. The structure gradient in the thickness direction in these samples is composed of very thick, highly oriented, skin regions followed by core regions of lower preferential chain orientation. In these samples, the shear-crystallized layers are observed to be much thicker than the comparably processed pure PP. The nucleation densities in the PP phase were too high to allow for observation of individual crystallites in most of the regions except near the very core, where sparsely distributed PP crystallites, that appear bright under cross polars, were observed. The wide-angle X-ray scattering (WAXS) patterns taken at different distances from the skin indicate that chain axes are mostly oriented in the flow direction, and distinct bimodal c-axis and a* axis oriented dual population of orientation is observed in the PP phase. c-axis orientation factors, fc, start at intermediate values at the skin and increase steadily and after showing a maximum roughly in the middle of the shear crystallized region, decrease towards the core, and in most cases never achieve a state of isotropy. In the blends that contain very small polypropylene fractions (ca ∼ 15%), unusually high orientation levels were observed. This was attributed to the “shear amplification” phenomena that dominates the thin PP regions between the rubber particles and causes significant orientation levels in the thin layers of PP coating, the rubber particles with the relative motion of the particles in the shear flow field.

Effects of graphene nanoplatelets on crystallization, mechanical performance and molecular dynamics of the renewable poly(propylene furanoate)

Polymer ◽  
2020 ◽  
Vol 189 ◽  
pp. 122172 ◽  
Author(s):  
Lazaros Papadopoulos ◽  
Panagiotis A. Klonos ◽  
Dimitrios Tzetzis ◽  
George Z. Papageorgiou ◽  
Apostolos Kyritsis ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Mechanical Performance ◽  
Graphene Nanoplatelets ◽  
Poly Propylene

Microstructure and Mechanical Performance Analysis of Metal-injection-molded Fe-2Ni Sintered Components

2011 ◽  
Author(s):  
Kuan-Hong Lin ◽  
Yu-Chan Hsieh ◽  
Shun-Tian Lin ◽  
Francisco Chinesta ◽  
Yvan Chastel ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Mechanical Performance ◽  
Injection Molded

Incorporating Dimensional Requirements Into Material Selection and Design of Injection Molded Parts

1996 ◽  
Author(s):  
Kurt A. Beiter ◽  
Kosuke Ishii
Keyword(s):  
Mechanical Performance ◽  
Material Selection ◽  
Production Costs ◽  
Research Approach ◽  
Manufacturing Cost ◽  
Part Geometry ◽  
Molded Parts ◽  
Injection Molded ◽  
Selection For ◽  
Design Selection

Abstract This paper presents a methodology for incorporating part dimensional tolerancing into material selection for engineering thermoplastics. This work builds on the authors’ previous efforts on integration of mechanical performance and manufacturing cost into candidate design selection. The benefit of this approach is the simultaneous consideration of the implications of material selection and part geometry on estimated manufacturing cost during candidate design selection. The research approach uses the Pressure-Volume-Temperature (PVT) method to estimate shrinkage in thermoplastic parts. The authors then present a method for calculating production costs for meeting part tolerance requirements. Example calculations and a computer program illustrate the proposed methodology.

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