Preparation and properties of polystyrene/magnesium hydroxide thermal conductive light diffusion material

doi:10.19491/j.issn.1001-9278.2024.11.002

Abstract

Abstract:

In this study， a thermal conductive light diffusion material with good optical and thermal conduction was prepared by blending polystyrene （PS） and magnesium hydroxide （MH） as an inorganic filler to match the refractive index. The comprehensive performance of the PS/MH thermal conductive light diffusion materials were regulated through adjusting the content of MH and employing the MH with a multi⁃particle size for compounding based on the experimental results obtained from the measurements on their micro⁃morphology， optical properties， thermal conductivity and mechanical properties. The results indicated that there was an MH thermal conductivity network formed in the matrix with an increase in the MH content. The transmittance of the thermal conductive light diffusion materials decreased gradually， their haze increased and tended to be stable， and their thermal conductivity was significantly improved. When 30 wt% MH with a multi⁃particle size content was incorporated， the resultant PS⁃30⁃3 thermal conductive light diffusion material obtained optimal comprehensive performance， its transmittance and haze reached 75.9 % and 92.70 %， respectively， and its thermal conductivity reached 0.52 W/（m·K）， which is 10 times as much as that of pure PS ［0.05 W/（m·K）］.

Key words: thermal conductive light diffusion material, polystyrene, magnesium hydroxide, property regulation

CLC Number:

TQ325.2

LIN Zhenbin, ZHU Huihao, WANG Yu, XIE Linsheng, LI Guo, MA Yulu. Preparation and properties of polystyrene/magnesium hydroxide thermal conductive light diffusion material[J]. China Plastics, 2024, 38(11): 8-13.

Figures/Tables 12

样品	PS	MH⁃1	MH⁃2	MH⁃3
PS	100	—	0	—
PS⁃10	90	—	10	—
PS⁃20	80	—	20	—
PS⁃30	70	—	30	—
PS⁃40	60	—	40	—
PS⁃30⁃1	70	20	10	—
PS⁃30⁃2	70	—	20	10
PS⁃30⁃3	70	10	10	10

Tab.1. Preparation scheme of the PS/MH thermally conductive light diffusion materials with different proportion

Fig.1. SEM images of the PS/MH thermally conductive light diffusion materials with different MH contents

Fig.2. Schematic diagram of the optical diffusion performance test platform

Fig.3. Photos of scattering spot of the PS/MH thermally conductive light diffusion materials with different MH contents

Fig.4. Changes of optical properties of the PS/MH thermally conductive light diffusion materials with MH contents

Fig.5. Changes of thermal conductivity of the PS/MH thermally conductive light diffusion materials with MH contents

Fig.6. Changes of mechanical property of the PS/MH thermally conductive light diffusion materials with MH contents

Fig.7. SEM images of the PS/MH thermally conductive light diffusion materials with multi⁃particle size MH compound

Fig.8. Optical properties of the PS/MH thermally conductive light diffusion materials with multi⁃particle size MH compound

样品	MH浓度/μm^-3
PS⁃30	1.11×10^-3
PS⁃30⁃1	3.73×10^-4
PS⁃30⁃2	7.26×10^-3
PS⁃30⁃3	6.89×10^-3

Tab.2. MH concentration in the PS/MH thermally conductive light diffusion material with multi⁃particle MH compound

Fig.9. Thermal conductivity of the PS/MH thermally conductive light diffusion materials with multi⁃particle size MH compound

Fig.10. Mechanical properties of the PS/MH thermally conductive light diffusion materials with multi⁃particle size MH compound

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