Fabrication of super‐ductile PP/LDPE blended parts with a chemical blowing agent

Zhou, Ying‐Guo; Su, Bei; Turng, Lih‐Sheng

doi:10.1002/app.44101

Cited by 21 publications

(22 citation statements)

References 40 publications

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“…The fillers that have been widely used for reinforcement purpose are organic fillers, ZnO, kaolin, CaCO 3 (CC), rice husk ash (RHA), etc. CC is one of the most commonly used inorganic fillers in thermoplastics such as poly(vinyl chloride) and PP .…”

Section: Introductionmentioning

confidence: 99%

Interfacial strengthening of polypropylene composites via bimodal porosity in Rice husk ash: Comparison with calcium carbonate reinforcement

Sharma

Lohia²,

Sharma³

et al. 2018

J of Applied Polymer Sci

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Polypropylene is used in the textile industry in the manufacturing of plastic yarns, tapes, etc., but its low tensile strength and Young's modulus limits its associated applications. Composites of polypropylene with reinforcement of CaCO3 and rice husk ash were processed by compression molding. Bimodal porosity in rice husk ash particles has shown an improved interfacial anchoring effect via capillary effect resulting in enhanced mechanical properties, whereas such an effect is not observed with CaCO3 reinforcement in polypropylene matrix. On reinforcement with 10 wt % of each of rice husk ash and CaCO3, thermal decomposition temperature of polypropylene (333.3 °C) shifted to higher value of 415.9 °C and polypropylene Young's modulus (749.5 MPa) increased to 789.5 MPa (by 5.3%), but tensile strength decreased from 23.5 to 21.2 MPa (by 2.3 MPa only). The isolated contribution of CaCO3 and rice husk ash has been delineated, and resulting interfacial strengths have been quantified using analytical models. Rice husk ash has shown a stronger interfacial anchoring and can effectively replace CaCO3 as reinforcement for achieving improved mechanical and thermal properties of polypropylene composites. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 46989.

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Section: Introductionmentioning

confidence: 99%

Interfacial strengthening of polypropylene composites via bimodal porosity in Rice husk ash: Comparison with calcium carbonate reinforcement

Sharma

Lohia²,

Sharma³

et al. 2018

J of Applied Polymer Sci

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show abstract

“…They found out that PP/LDPE blend tends to create super-ductile parts using the chemical foaming method. They also found out a close relationship between morphological structures which were influenced by the packing pressure and time, dosage of the blowing agent and ratio of the composition and mechanical properties [5].…”

Section: Introductionmentioning

confidence: 89%

Optimization of fall height setting for drop weight tested polypropylene

Hylova

Maňas

2017

MATEC Web Conf.

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Abstract. This study deals with polypropylene (PP) which was subjected the drop-weight test. PP is a semicrystalline thermoplastic polymer which is commonly used in many indoor applications and also in the automotive industry in the car interiors. The injection moulded PP samples were subjected the penetration test at different fall heights and the results were subsequently evaluated and discussed. It was found out that the fall heights from 100 to 230 J are suitable for PP penetration, but the optimal one is 100 J. Higher heights are not needed because of increasing power consumption of the test device.

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“…31 To improve the foamability of pure linear PP resin, several strategies have been proposed. [32][33][34][35][36][37][38][39][40][41][42] These efforts can be roughly classified into three categories: (a) incorporation of micro/ nanoparticles or fibers into the PP matrices facilitating cell nucleation, 32,33 (b) blending with other polymers to improve the foaming effect, [34][35][36][37][38][39][40] and (c) self-modification by branching and crosslinking to improve the foamability. 42,43 These efforts to improve the foamability generally originated from the material composition.…”

Section: Introductionmentioning

confidence: 99%

Combining foam injection molding with batch foaming to improve cell density and control cellular orientation via multiple gas dissolution and desorption processes

Zhou

Chen

2020

Polymers for Advanced Techs

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In contrast to solid parts fabricated through conventional injection molding (CIM), foamed parts manufactured via foam injection molding (FIM) exhibit substantial variations in mechanical properties, which are attributed to differences in the cellular structure. In this study, parts with different cellular structures are fabricated via FIM, during which the gas dissolution and desorption processes are controlled by subjecting the gas‐laden melt to reciprocating compression and expansion operations. The results suggest that the cell density can be drastically improved by rapidly decreasing the pressure caused by the mold opening and that the cell orientation obviously occurs in the direction perpendicular to the mold‐opening direction. Moreover, the cell density and cellular orientation can be adjusted by utilizing appropriate mold opening and closing operations, leading to improvements in the resultant ultimate mechanical properties. In particular, the foamed samples fabricated with controlled mold opening‐closing operations exhibit excellent tensile strength and strain‐at‐break, indicating that samples containing a high density of cells oriented along the tensile test direction facilitate the formation of superductility and an increase in tensile strength. Hence, a method that combines FIM with batch foaming has been proposed for improving the cellular structure and controlling the cellular orientation.

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Fabrication of super‐ductile PP/LDPE blended parts with a chemical blowing agent

Cited by 21 publications

References 40 publications

Interfacial strengthening of polypropylene composites via bimodal porosity in Rice husk ash: Comparison with calcium carbonate reinforcement

Interfacial strengthening of polypropylene composites via bimodal porosity in Rice husk ash: Comparison with calcium carbonate reinforcement

Optimization of fall height setting for drop weight tested polypropylene

Combining foam injection molding with batch foaming to improve cell density and control cellular orientation via multiple gas dissolution and desorption processes

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