Effect of crystallite size of zinc oxide on the mechanical, thermal and flow properties of polypropylene/zinc oxide nanocomposites

Esthappan, Saisy Kudilil; Nair, Ajalesh B.; Joseph, Rani

doi:10.1016/j.compositesb.2013.08.010

Cited by 62 publications

(24 citation statements)

References 21 publications

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“…Moreover, the silicone light‐diffusing agent improves the thermal decomposition activation energy of LDM compared to that of neat PC, although it undergoes a smaller change at the decomposition onset temperature compared to neat PC. The improvement of the silicone LDM's thermal stability is attributed to the good intrinsic thermal stability of the silicone agent, in agreement with the previously reported thermal stability results for polymer/inorganic particle composites …”

Section: Resultssupporting

confidence: 91%

“…The improvement of the silicone LDM's thermal stability is attributed to the good intrinsic thermal stability of the silicone agent, in agreement with the previously reported thermal stability results for polymer/inorganic particle composites. [16][17][18][19] The thermal stability of LDMs is important for their subsequent application. Because of its good thermal stability, the silicone LDM is amenable to being formed into a tubular or panel cover for a tubular LED lamp or panel lamp through a single-screw extrusion molding process at a relatively slow speed.…”

Section: Thermal Stability Of the Ldmsmentioning

confidence: 99%

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Light‐diffusing materials for LED illumination applications: Comparing the effectiveness of two typical light‐diffusing agents

Ouyang

Chen

et al. 2015

J of Applied Polymer Sci

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Light-diffusing materials (LDMs) are the primary lampshade materials used for indoor light-emitting diode (LED) illumination. In this work, two varieties of typical LDMs filled with acrylic or silicone diffusing agents were fabricated via a twin-screw extruder, and the influences of the particle size, refractive index and light-diffusing surface area of the light-diffusing agents on the properties of the LDMs, including their light-diffusing properties, thermal stability and mechanical properties, were explored in depth. The results indicated that both acrylic and silicone light-diffusing agents can be dispersed evenly in a polycarbonate (PC) matrix. The light-diffusing surface area and refractive index are the main factors that influence the diffusing properties of LDMs. Compared with the silicone LDM, the acrylic LDM exhibited higher transmittance but poorer thermal stability and impact strength, making this material suitable for a rapid injection molding process to form half-sphere covers that combine high haze and transmittance for LED light bulbs. Silicone LDMs exhibit good stability and impact strength, favoring a slow single-screw extrusion molding process to prepare tubular or panel covers for tubular LED lamps and panel lamps. In this study, a method for producing LDMs with both high transmittance and high haze is reported.

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Section: Resultssupporting

confidence: 91%

Section: Thermal Stability Of the Ldmsmentioning

confidence: 99%

Light‐diffusing materials for LED illumination applications: Comparing the effectiveness of two typical light‐diffusing agents

Ouyang

Chen

et al. 2015

J of Applied Polymer Sci

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“…Incorporation of ZnO was studied by various researchers to enhance their composite properties, such as antibacterial , UV absorbers , hardness, wear‐resistance , and thermal degradability . Esthappan et al recorded an improvement in the thermal stability of PP by the addition of ZnO, which attributes to an increment in the onset of degradation. In the medical point of view, bacterial infection is among the main complication related to implanted medical device with 3,000–6,000 implant failure cases per year that make up 1.5%–2.5% from the total orthopedic procedures .…”

Section: Introductionmentioning

confidence: 99%

The effects of hybrid fillers on thermal, mechanical, physical, and antimicrobial properties of ultrahigh-molecular-weight polyethylene-reinforced composites

et al. 2015

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The effects of hybrid filler of zinc oxide and chitosan (chitosan-ZnO) on thermal, flexural, antimicrobial, chemical resistance, and hardness properties of ultrahighmolecular-weight polyethylene (UHMWPE) composites with varying concentration of zinc oxide (ZnO) and further hybridized by chitosan (CS) were successfully studied. The composites were prepared using mechanical ball milling and followed by hot compression molding. The addition of ZnO to the UHMWPE matrix had lowered the melting temperature (T m ) of the composite but delayed its degradation temperature. Further investigation of dual filler incorporation was done by the addition of chitosan to the UHMWPE/ZnO composite and resulted in the reduction of UHMWPE crystallization. The flexural strength and modulus had a notably high improvement through ZnO addition up to 25 wt% as compared to neat UHMWPE. However, the addition of chitosan had resulted in lower flexural strength than that of 12 wt% ZnO UHMWPE composite but still higher than that of neat UHMWPE. It was experimentally proven that the incorporation of ZnO and chitosan particles within UHMWPE matrix had further enhanced the antimicrobial properties of neat UHMWPE. Chemical resistance was improved with higher ZnO content with a slight reduction of mass change after the incorporation of chitosan. The hardness value increased with ZnO addition but higher incorporation of chitosan had lowered the hardness value. These findings have significant implications for the commercial application of UHMWPE based products. It appears that these hybrid fillers (chitosan-ZnO)-reinforced UHMWPE composites exhibit superior overall properties than that of conventional neat UHMWPE. POLYM. COMPOS., 00:000-000, 2015.

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“…Recently, it has been noted that also some metallic nucleating agents having nanometric dimensions can influence the polyolefin chains during the crystallization process [15][16][17][18][19]. In the above cited works, the formation of b polymorph was a result of a simultaneous effect of metallic nanoparticles and physical factors (shear forces) [16][17][18][19]. Therefore, a direct role of metallic nucleating agents in the formation of b polymorph isotactic polypropylene remains an open question.…”

Section: Nanocz¹stki Srebra W Izotaktycznym Polipropylenie Cz II Mmentioning

confidence: 99%

Silver nanoparticles in isotactic polypropylene. Part II. Molecular modelling of polypropylene chains arrangement on the surface of silver nanoparticles

2015

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Molecular modelling (MM) was used to explain the mechanism of formation of polymorphic b form of isotactic polypropylene (iPP) at the surface of the silver nanoparticles (nAg). Geometrical optimization of iPP chains and unit cell of Ag systems was made with the use of MM+ force field in vacuum. According to the results, the arrangement of methyl groups in the (110) contact plane implies a lateral packing of helices with a periodicity a » 19 Å, which is a characteristic feature of the complicated packing of helices in b iPP. Partial charges calculated on the basis of the hybrid potential BLYP revealed the possibility of electrostatic interactions between hydrogens from methyl groups and silver atoms at the edge of unit cell. Analysis of the optimized iPP/Ag system confirmed that the formation of the polymorphic b iPP can be explained by the epitaxial mechanism.

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Effect of crystallite size of zinc oxide on the mechanical, thermal and flow properties of polypropylene/zinc oxide nanocomposites

Cited by 62 publications

References 21 publications

Light‐diffusing materials for LED illumination applications: Comparing the effectiveness of two typical light‐diffusing agents

Light‐diffusing materials for LED illumination applications: Comparing the effectiveness of two typical light‐diffusing agents

The effects of hybrid fillers on thermal, mechanical, physical, and antimicrobial properties of ultrahigh-molecular-weight polyethylene-reinforced composites

Silver nanoparticles in isotactic polypropylene. Part II. Molecular modelling of polypropylene chains arrangement on the surface of silver nanoparticles

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