Preparation of monodisperse polystyrene microspheres: effect of reaction parameters on particle formation, and optical performances of its diffusive agent application

Chen, Ching Wen; Chen, Chuh‐Yung

doi:10.1007/s00396-009-2098-9

Cited by 17 publications

(13 citation statements)

References 31 publications

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“…As shown in Figure , plates with different thicknesses reach maximum haze at a surface area of 100 cm 2 for the silicone microsphere‐filled LDM plate and at 200 cm 2 for the acrylic microsphere‐filled LDM plate. The phenomenon of LDMs achieving maximal haze at a specific threshold of total light‐diffusing particle surface area has also been reported . According to the literature, the diffusing properties are determined by the surface area of the light‐diffusing agents and are less related to the particle size or size distribution, although the particle size and size distribution of light‐diffusing particles are important factors that influence the diffusing properties of LDMs.…”

Section: Resultsmentioning

confidence: 99%

“…The phenomenon of LDMs achieving maximal haze at a specific threshold of total light‐diffusing particle surface area has also been reported . According to the literature, the diffusing properties are determined by the surface area of the light‐diffusing agents and are less related to the particle size or size distribution, although the particle size and size distribution of light‐diffusing particles are important factors that influence the diffusing properties of LDMs. Additionally, when a specific type of light‐diffusing agent is used, LDMs with the same light‐diffusing particle surface area will exhibit the same haze and transmittance, although the particles may have different particle sizes or particle size distributions …”

Section: Resultsmentioning

confidence: 99%

“…Additionally, when a specific type of light-diffusing agent is used, LDMs with the same lightdiffusing particle surface area will exhibit the same haze and transmittance, although the particles may have different particle sizes or particle size distributions. [11][12][13] The difference in the refractive indices of the light-diffusing agent and matrix in LDMs is another important factor that determines the diffusing properties of these materials. As the refractive index difference increases, the amount of scattered light increases; as a result, a smaller diffusing surface area is required to achieve maximal haze.…”

Section: Dispersion Of Microspheres In the Matrixmentioning

confidence: 99%

“…[1][2][3][4]9,10 In the composites prepared by this method, the diameter and relative refractive index of the diffusing agent are critical for the light-diffusing properties. 1,2,[11][12][13] If a light-diffusing agent with suitable diameter and relative refractive index is selected, the forward scattering of the LDM will be increased, resulting in both high haze and high transmittance.…”

Section: Introductionmentioning

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: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Dispersion Of Microspheres In the Matrixmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…The disadvantage of emulsion polymerization is however that emulsifiers often pollute the core‐shell type composites and negatively impact their smoothness and morphology 22. Such disadvantages can be overcome through dispersion polymerization that does not use emulsifiers 23–26. A continuous and dense polymer layer coating was demonstrated in the case of polystyrene coating of Fe 3 O 4 particles using dispersion polymerization 27.…”

Section: Introductionmentioning

confidence: 99%

Polystyrene‐coated alumina powder via dispersion polymerization for indirect selective laser sintering applications

Cardon¹,

Deckers²,

Verberckmoes³

et al. 2012

J of Applied Polymer Sci

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A promising method for the manufacture of complex 3D ceramic parts is selective laser sintering (SLS). SLS of alumina components can be done either directly or indirectly. In this article, the indirect method is used by using polystyrene coated alumina particles. One of the methods to produce these alumina powders is dispersion polymerization. In this research, it is described how the alumina powder has been developed and tested. The powder has been characterized to define its processability within the SLS process. Used techniques include SEM (morphology), STA/TGA (overall mass loss), DSC (glass transition temperature T g ), and laser diffraction (particle size distribution). The investigated SLS process parameters were the preheating temperature, laser power, scan spacing, and scan speed. STA/TGA has proven that polystyrene-coated alumina powders are suitable for SLS process, while DSC results were judged to be a good source of complementary data on preheating temperature of alumina/polystyrene powders. SLS experiments showed that single layer green parts can be produced. By using the optimized SLS parameters, it was demonstrated that different 3D geometries can be produced with the polystyrene coated alumina powders.

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Preparation of polypropylene microspheres for selective laser sintering via thermal‐induced phase separation: Roles of liquid–liquid phase separation and crystallization

Wang

Liu

Chu

et al. 2016

J Polym Sci B Polym Phys

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Although selective laser sintering (SLS) has been widely applied in many fields, more research work is needed to develop proper polymer microspheres for SLS. Thermalinduced phase separation (TIPS) is a facile way but rarely reported to prepare the polymer microspheres. The roles of liquid-liquid phase separation (LLPS) and crystallization in the TIPS process are not clear. In this study, proper polypropylene (PP) microspheres for SLS are successfully prepared via TIPS with xylene. The diameters and morphologies of these PP microspheres can be regulated easily by changing the PP concentration and the quench temperature. The large undercooling drives the solution into the metastable LLPS region and produces PP microspheres with smooth surfaces. The PP crystallization occurs both on the LLPS interface and inside the polymer-rich phase when the solution is quenched to a temperature near the binodal line, and the tiny bent lamellae are formed on the microsphere surface. At higher temperature only PP crystallization occurs, which results in the formation of PP particles consisting of packed lamellae. The PP microspheres prepared here are suitable for SLS and promote the development of SLS potentially.

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Preparation of monodisperse polystyrene microspheres: effect of reaction parameters on particle formation, and optical performances of its diffusive agent application

Cited by 17 publications

References 31 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

Polystyrene‐coated alumina powder via dispersion polymerization for indirect selective laser sintering applications

Preparation of polypropylene microspheres for selective laser sintering via thermal‐induced phase separation: Roles of liquid–liquid phase separation and crystallization

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