Comparison of the effect of ethylene and hexene-1 co-monomers on the composition, microstructure, rheology, thermal and mechanical behaviour of randomized polypropylene hetero-phasic block co-polymers

RSC Advances ◽  
2016 ◽  
Vol 6 (106) ◽  
pp. 104438-104450 ◽  
Author(s):  
S. Omidreza Mousavi ◽  
Y. Jahani ◽  
H. Arabi
Keyword(s):  
Impact Strength ◽  
Isotactic Polypropylene ◽  
Mechanical Behaviour ◽  
Interfacial Interaction ◽  
Phasic Block

Ethylene and hexene-1 co-monomers were applied to isotactic polypropylene reactor alloys to compare the effect of the co-monomer type on their interfacial interaction and impact strength.

Mechanical and flame retardant properties of isotactic polypropylene/magnesium oxysulfate whisker composite

2017 ◽  
Vol 31 (4) ◽  
pp. 514-534 ◽  
Author(s):  
Li Dang ◽  
Xueying Nai ◽  
Xin Liu ◽  
Donghai Zhu ◽  
Yaping Dong ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Interfacial Interaction ◽  
Flexural Behavior ◽  
Cone Calorimetry ◽  
Melt Mixing ◽  
Suppression Effect ◽  
Peak Heat Release Rate ◽  
Magnesium Oxysulfate ◽  
Flame Retardant Properties ◽  
Better Than

Isotactic polypropylene (iPP) composites containing magnesium oxysulfate whisker (MOSw) or lauric acid-modified MOSw (LA-MOSw) were prepared via melt mixing in a torque rheometer. Scanning electron microscopy pictures showed that the interface between MOSw and iPP matrix was defined, whereas a vague interface was seen in the iPP–LA-MOSw composites. Mechanical properties of these two groups of composites were investigated in terms of tensile, notched impact, and flexural behavior aspects for the purposes of studying toughening effect of MOSw and LA-MOSw. Tensile results showed that yield strength of composites further reduced with the presence of LA, indicating the decrease in interfacial interaction bewteen iPP matrix and MOSw. As such, LA-MOSw performed better than MOSw in toughening of iPP matrix. Flexural strength and modulus of iPP–MOSw composites increased sharply with the increase in MOSw content, while less dependence on the LA-MOSw content indicated that MOSw was deemed beneficial to increase the stiffness. In addition, flammability properties were investigated by cone calorimetry experiment. The results showed that the peak heat release rate apparently reduced with addition of MOSw or LA-MOSw. Besides, iPP–LA-MOSw composites showed higher specific extinction area values than iPP–MOSw composites, which meant the weaker smoke suppression effect of LA-MOSw. It was chiefly because of the incomplete combustion caused by the continuous and complete charred (MgO) shield. The presence of LA was another possible reason.

The effect of specific nucleation on tensile mechanical behaviour of isotactic polypropylene

2004 ◽  
Vol 40 (7) ◽  
pp. 1317-1323 ◽  
Author(s):  
Miroslav Raab ◽  
Jaroslav Ščudla ◽  
Jan Kolařı́k
Keyword(s):  
Isotactic Polypropylene ◽  
Mechanical Behaviour

Micro-Structure and Mechanical Property of Polypropylene Composites Filled with Modified Attapulgite

2012 ◽  
Vol 174-177 ◽  
pp. 1384-1387
Author(s):  
Li Li Xu ◽  
Chang Hua Liu ◽  
Sheng Peng Liu
Keyword(s):  
Impact Strength ◽  
Chemical Structure ◽  
Interfacial Interaction ◽  
Micro Structure ◽  
Polypropylene Composites ◽  
Propyl Methacrylate ◽  
Izod Impact Strength ◽  
Izod Impact ◽  
Modified Attapulgite ◽  
Scanning Electron

Organified Attapulgites (AT) were grafted with 3-(trimethoxysilyl) propyl methacrylate ( KH570 ) on the surface of AT particles. Then, the modified AT (AT-g-KH570) and untreated AT particles were compounded with polypropylene (PP) to prepare PP/AT-g-KH570 and PP/AT composites respectively. The morphology, chemical structure and mechanical properties of the composites were also investigated with scanning electron microscopy (SEM), Fourier-transform infrared spectra (FTIR) and mechanical testing. The FTIR results showed that the KH570 is grafted on the AT particles. The tensile strength and izod impact strength of PP/AT-g-KH570 composites were improved obviously than those of PP/AT composites. The izod impact strength of PP/AT-g-KH570 composites show the maximum and was enhanced 50 % at 1 wt% loading, which contributed to homogeneous dispersion of particles and enhanced the interfacial interaction between modified AT particles and PP matrix.

scholarly journals Evaluation of Dispersion Methods and Mechanical Behaviour of Glass Fibre Composites with Embedded Self-Healing Systems

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1642
Author(s):  
Ionut Sebastian Vintila ◽  
Sorin Draghici ◽  
Horia Alexandru Petrescu ◽  
Alexandru Paraschiv ◽  
Mihaela Raluca Condruz ◽  
...  
Keyword(s):  
Impact Strength ◽  
Thermal Cycling ◽  
Glass Fibre ◽  
Mechanical Behaviour ◽  
Epoxy Matrix ◽  
Impact Testing ◽  
Self Healing ◽  
Dispersion Method ◽  
Fibre Composites ◽  
The Impact

The present paper is focused on evaluating the most suitable dispersion method in the epoxy matrix of two self-healing systems containing dicyclopentadiene (DCPD) and 5-ethylidene-2-norbornene (ENB) monomers encapsulated in a urea-formaldehyde (UF) shell, prior to integration, fabrication and impact testing of specimens. Both microstructural analysis and three-point bending tests were performed to evaluate and assess the optimum dispersion method. It was found that ultrasonication damages the microcapsules of both healing systems, thus magnetic stirring was used for the dispersion of both healing systems in the epoxy matrix. Using magnetic dispersion, 5%, 7%, 10%, 12% and 15% volumes of microcapsules were embedded in glass fibre composites. Some of the samples were subjected to thermal cycling between −20 °C and +100 °C for 8 h, to evaluate the behaviour of both healing systems after temperature variation. Impact test results showed that the mechanical behaviour decreases with increasing microcapsule volume, while for specimens subjected to thermal cycling, the impact strength increases with microcapsule volume up to 10%, after which a severe drop in impact strength follows. Retesting after 48 h shows a major drop in mechanical properties in specimens containing 15% MUF-ENB microcapsules, up to total penetration of the specimen.

Structures and Properties of Isotactic-Polypropylene/Synthesized Micro Cellulose Tray: Effects of Micro Cellulose Loading

2012 ◽  
Vol 626 ◽  
pp. 716-720
Author(s):  
Pongpat Sukhavattanakul ◽  
Lerpong Jarupan ◽  
Chiravoot Pechyen
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Thermal Properties ◽  
Cotton Fabric ◽  
Isotactic Polypropylene ◽  
Interfacial Interaction ◽  
Morphological Properties ◽  
Structures And Properties ◽  
Reinforcing Agent ◽  
Twin Screw

Cellulose was derived from cotton fabric waste. Composites of microcellulose fibers (MC) and isotactic polypropylene (i-PP) was prepared by melting and mixing, and maleic anhydride grafted polypropylene (MA-g-PP) was used as compatibilizer. The MC was blended in different ratios up to 20 phr with i-PP using corotating twin-screw compounder and then a forming of trays was done by injection molding. Effects of MC on mechanical properties of i-PP were investigated. Changes in mechanical and morphological properties with different MC loading were discussed. The composite of i-PP/MA-g-PP/MC rendered better results in comparison with the i-PP/MC composite. The compressive strength and modulus of i-PP/MC composites increased with the addition of 20 phr MC. The i-PP/MA-g-PP/MC-20phr composites showed higher compressive strength and modulus than the i-PP/MC-20 phr without MA-g-PP due to increased interfacial interaction between MC and i-PP matrix. Thermal properties of i-PP/MC composites with and without MA-g-PP were not significantly different from pure i-PP. In conclusion, MC derived from cotton fabric waste could be used as a reinforcing agent for manufacturing thermoplastic.

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