Effects of Compatibilizers on Properties of Polypropylene/Bamboo Fiber Composites

2017 ◽  
Vol 728 ◽  
pp. 301-306 ◽  
Author(s):  
Jitlada Boonlertsamut ◽  
Rutchaneekorn Wongpajan ◽  
Supaphorn Thumsorn ◽  
Hiroyuki Hamada
Keyword(s):  
Mechanical Performance ◽  
Fiber Composites ◽  
Bamboo Fiber ◽  
Injection Molding Process ◽  
Screw Extruder ◽  
Molding Process ◽  
Thermoplastic Material ◽  
Twin Screw ◽  
And Storage ◽  
Enhanced Crystallinity

Bamboo fiber (BF) reinforced thermoplastic material composites were prepared in this study. polypropylene (PP) was compounded with bamboo fiber in a twin screw extruder at bamboo fiber contents of 0-30 wt% with polyethylene grafted maleic anhydride (PE-g-MA) as modifying agent. PP/bamboo fiber composites were to dumbbell specimens by injection molding process. The effect of bamboo fiber contents on properties of the composites was investigated. Tensile and storage modulus of the composites increased when increasing bamboo fiber contents. It can be noted that bamboo fiber promoted crystallization and enhanced crystallinity of PP in the composites, which improved the composites mechanical performance. On the contrary, tensile strength of the PP/BF composites was almost unchanged. Nevertheless, it was considering that the level of interaction between bamboo fiber and PP could be enhanced at higher contents of PE-g-MA. It can be noted that fracture toughness of the PP/BF composites was maintained at the BF contents of 10 wt%, which was attributed to the good interaction between bamboo fiber and PP matrix with the addition of PE-g-MA.

scholarly journals Effects of a Twin-Screw Extruder Equipped with a Molten Resin Reservoir on the Mechanical Properties and Microstructure of Recycled Waste Plastic Polyethylene Pellet Moldings

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1058
Author(s):  
Hikaru Okubo ◽  
Haruka Kaneyasu ◽  
Tetsuya Kimura ◽  
Patchiya Phanthong ◽  
Shigeru Yao
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
Value Added ◽  
Industrial Applications ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Polymer Properties ◽  
Wide Range ◽  
Twin Screw ◽  
Recycled Plastics

Each year, increasing amounts of plastic waste are generated, causing environmental pollution and resource loss. Recycling is a solution, but recycled plastics often have inferior mechanical properties to virgin plastics. However, studies have shown that holding polymers in the melt state before extrusion can restore the mechanical properties; thus, we propose a twin-screw extruder with a molten resin reservoir (MSR), a cavity between the screw zone and twin-screw extruder discharge, which retains molten polymer after mixing in the twin-screw zone, thus influencing the polymer properties. Re-extruded recycled polyethylene (RPE) pellets were produced, and the tensile properties and microstructure of virgin polyethylene (PE), unextruded RPE, and re-extruded RPE moldings prepared with and without the MSR were evaluated. Crucially, the elongation at break of the MSR-extruded RPE molding was seven times higher than that of the original RPE molding, and the Young’s modulus of the MSR-extruded RPE molding was comparable to that of the virgin PE molding. Both the MSR-extruded RPE and virgin PE moldings contained similar striped lamellae. Thus, MSR re-extrusion improved the mechanical performance of recycled polymers by optimizing the microstructure. The use of MSRs will facilitate the reuse of waste plastics as value-added materials having a wide range of industrial applications.

Bioactive poly(etheretherketone) composite containing calcium polyphosphate and multi-walled carbon nanotubes for bone repair: Mechanical property and in vitro biocompatibility

2018 ◽  
Vol 33 (5) ◽  
pp. 543-557 ◽  
Author(s):  
Jianfei Cao ◽  
Yue Lu ◽  
Hechun Chen ◽  
Lifang Zhang ◽  
Chengdong Xiong
Keyword(s):  
Mechanical Property ◽  
Carbon Nanotubes ◽  
Bone Repair ◽  
Mechanical Performance ◽  
Injection Molding Process ◽  
Molding Process ◽  
Calcium Polyphosphate ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Poly(etheretherketone) exhibits good biocompatibility, excellent mechanical properties, and bone-like stiffness. However, the natural bio-inertness of pure poly(etheretherketone) hinders its applications in biomedical field, especially when direct bone-implant osteo-integration is desired. For developing an alternative biomaterial for load-bearing orthopedic application, combination of bioactive fillers with poly(etheretherketone) matrix is a feasible approach. In this study, a bioactive multi-walled carbon nanotubes/calcium polyphosphate/poly(etheretherketone) composite was prepared through a compounding and injection-molding process for the first time. Bioactive calcium polyphosphate was added to polymer matrix to enhance the bioactivity of the composite, and incorporation of multi-walled carbon nanotubes to composite was aimed to improve both the mechanical property and biocompatibility. Furthermore, the microstructures, surface hydrophilicity, and mechanical property of multi-walled carbon nanotubes/calcium polyphosphate/poly(etheretherketone) composite, as well as the cellular responses of MC3T3-E1 osteoblast cells to this material were investigated. The mechanical testing revealed that mechanical performance of the resulting ternary composite was significantly enhanced by adding the multi-walled carbon nanotubes and the mechanical values obtained were close to or higher than those of human cortical bone. More importantly, cell culture tests showed that initial cell adhesion, cell viability, and osteogenic differentiation of MC3T3-E1 cells were significantly promoted on the multi-walled carbon nanotubes/calcium polyphosphate/poly(etheretherketone) composite. Accordingly, the multi-walled carbon nanotubes/calcium polyphosphate/poly(etheretherketone) composite may be used as a promising bone repair material in dental and orthopedic applications.

scholarly journals Effects of a Phosphorus Flame Retardant System on the Mechanical and Fire Behavior of Microcellular ABS

Polymers ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 30 ◽  
Author(s):  
Vera Realinho ◽  
David Arencón ◽  
Marcelo Antunes ◽  
José Velasco
Keyword(s):  
Flame Retardant ◽  
Impact Energy ◽  
Weight Reduction ◽  
Flame Retardants ◽  
Mechanical Performance ◽  
Fire Behavior ◽  
Acrylonitrile Butadiene Styrene ◽  
Injection Molding Process ◽  
Molding Process ◽  
The Impact

The present work deals with the study of phosphorus flame retardant microcellular acrylonitrile–butadiene–styrene (ABS) parts and the effects of weight reduction on the fire and mechanical performance. Phosphorus-based flame retardant additives (PFR), aluminum diethylphosphinate and ammonium polyphosphate, were used as a more environmentally friendly alternative to halogenated flame retardants. A 25 wt % of such PFR system was added to the polymer using a co-rotating twin-screw extruder. Subsequently, microcellular parts with 10, 15, and 20% of nominal weight reduction were prepared using a MuCell® injection-molding process. The results indicate that the presence of PFR particles increased the storage modulus and decreased the impact energy determined by means of dynamic-mechanical-thermal analysis and falling weight impact tests respectively. Nevertheless, the reduction of impact energy was found to be lower in ABS/PFR samples than in neat ABS with increasing weight reduction. This effect was attributed to the lower cell sizes and higher cell densities of the microcellular core of ABS/PFR parts. All ABS/PFR foams showed a self-extinguishing behavior under UL-94 burning vertical tests, independently of the weight reduction. Gradual decreases of the second peak of heat release rate and time of combustion with similar intumescent effect were observed with increasing weight reduction under cone calorimeter tests.

Study of a novel co-rotating non-twin screw extruder in processing flame retardant polymer materials

2017 ◽  
Vol 37 (8) ◽  
pp. 827-835
Author(s):  
Song Zhao ◽  
Baiping Xu ◽  
Liang He ◽  
Huiwen Yu ◽  
Shouzai Tan
Keyword(s):  
Flame Retardant ◽  
Mechanical Performance ◽  
Acrylonitrile Butadiene Styrene ◽  
Operating Conditions ◽  
Polymer Materials ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Limiting Oxygen Index ◽  
Twin Screw ◽  
Halogen Free

Abstract A thorough study was carried out to investigate the priority of a novel co-rotating non-twin screw extruder (NTSE) over a traditional twin screw extruder (TSE) in the mixing process of halogen-free intumescent flame-retardant acrylonitrile-butadiene-styrene (ABS) composites. The homogeneity of the flame-retardant additives of the composites processed by NTSE and TSE under the same operating conditions was characterized by using mechanical performance properties, limiting oxygen index values, UL-94 tests, and thermogravimetric analysis. All the results suggested that NTSE could achieve better mixing of the flame-retardant additives in the polymer matrix than TSE, which was further clarified by the scanning electron microscope pictures.

Investigation on the uniformity of high-density polyethylene/wood fiber composites in a twin-screw extruder

2009 ◽  
Vol 113 (4) ◽  
pp. 2081-2089 ◽  
Author(s):  
Jingjing Zhang ◽  
Chul B. Park ◽  
Ghaus M. Rizvi ◽  
Hanxiong Huang ◽  
Qingping Guo
Keyword(s):  
High Density Polyethylene ◽  
Wood Fiber ◽  
Fiber Composites ◽  
High Density ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Twin Screw

Mechanical Force Induced Grafting Effect on Strengthening HDPE/GF Composites with Maleic Anhydride

2007 ◽  
Vol 353-358 ◽  
pp. 1463-1466
Author(s):  
Xian Feng Zhou ◽  
Guang Ze Dai ◽  
Li Xin Dong ◽  
L.L. Liu ◽  
Qing Qing Ni
Keyword(s):  
Maleic Anhydride ◽  
High Speed ◽  
Mechanical Force ◽  
Interfacial Stress ◽  
Injection Molding Process ◽  
Molding Process ◽  
The Matrix ◽  
Twin Screw ◽  
Chemical Coupling ◽  
Grafting Degree

Grafting of maleic anhydride (MAH) onto high density polyethylene (HDPE) was carried out in melt state through the mechanical force initiation caused by high-speed rotation of the twin-screw, investigating its functional reaction and the grafting degree influenced by the rotation of the twin-screw, observing the influence on its mechanical property. The results showed that the increase of grafting degree made the interface phase produce a firm chemical coupling, which improved the tensile-strength and flexural strength of the composites. The produced interfacial stress from the shrinkage of specimen melts in injection molding process can strain-induce the forming of the extended-chain crystals in the matrix and obviously improve the notched impact strength of the composites.

scholarly journals Effects of the molding process on properties of bamboo fiber/epoxy resin composites

BioResources ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. 7416-7427
Author(s):  
Jiangjing Shi ◽  
Yanping Zou ◽  
Wenfu Zhang ◽  
Hong Chen
Keyword(s):  
Epoxy Resin ◽  
High Performance ◽  
Thermomechanical Analysis ◽  
Fiber Composites ◽  
Filament Winding ◽  
Bamboo Fiber ◽  
Advanced Technology ◽  
Resin Composites ◽  
Molding Process ◽  
Epoxy Resin Composites

Filament winding is an advanced technology for fabrication of high-performance composites. Pressure-free fabrication can be achieved for non-planar composites with complicated shapes using resin-immersed twisting fibers. In this study, twisted bamboo fiber (TBF) composites were prepared by a filament winding processing (FWP). Short bamboo fiber (SBF), long bamboo fiber (LBF), and TBF composites were prepared by hot pressing (HP) and resin transfer molding (RTM). The results showed that the bamboo fiber/epoxy resin composites were positively related to the fiber size. The bamboo fiber/epoxy resin composites fabricated by FWP exhibited optimal shear performance, while those generated by RTM exhibited optimized bending performance. Dynamic thermomechanical analysis revealed that composites made by FWP had optimized interfaces. The FWP mechanism of bamboo fiber composites was resin immersion and alignment of TBF; upon resin immersion the TBF were coated by resin and could not enter the internal tubes or parenchyma tissues of the TBF. The TBF was aligned by winding equipment. After heated solidification of the resin, several bubble pores were distributed on both sides of the TBF, whose positions remained static over time. The filament winding processing for bamboo fiber composites enhanced their performance and could lead to the applications in bamboo fibers composites.

scholarly journals Study on Reinforced Modification of Polylactic Acid by New Hyperbranched Polyamide

2021 ◽  
Author(s):  
Jianjian Sun ◽  
Yansong Huang ◽  
Yu juan Jin ◽  
Lu Wang ◽  
Huafeng Tian
Keyword(s):  
Polylactic Acid ◽  
Raw Materials ◽  
Extrusion Process ◽  
Injection Molding Process ◽  
Molding Process ◽  
Twin Screw ◽  
Chemical Crosslinks ◽  
One Step ◽  
The Impact ◽  
Hyperbranched Polyamide

Abstract In order to achieve enhanced physical performance of polylactic acid (PLA), the hyperbranched polyamide (HBPA) was synthesized by "one-step" as raw materials, and added as a modifier to the PLA matrix. The HBPA/PLA blend was prepared through the twin screw extrusion process and the injection molding process. The results showed that, compared with pure PLA, the tensile strength of HBPA/PLA blends increased by 41.8% while the elongation at break and the impact strength basically unchanged. The addition of HBPA does not affect the glass transition temperature (Tg) and crystallization of PLA significantly, but can improve the thermal deformation temperature of PLA. HBPA acted as a nucleant for PLA during iso-temperature crystallization. HBPA could form hydrogen bonds and chemical crosslinks with PLA, thus exhibits excellent reinforcing effect for PLA.

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