Polycarbonate composites with high light transmittance, haze, and flame retardancy based on a series of incomplete-cage
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Polycarbonate composites with high light transmittance, haze, and flame retardancy based on a series of incomplete-cage oligomeric silsesquioxanes Xiaolu Wu1, Xiaoxia Wang1, Zhaolu Qin1, and Wenchao Zhang1,* 1
National Engineering Technology Research Center of Flame Retardant Material, School of Materials, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, People’s Republic of China
Received: 27 May 2020
ABSTRACT
Accepted: 12 August 2020
A series of incomplete-cage polyhedral oligomeric silsesquioxanes (DVPOSSs) bearing vinyl groups (–CH=CH2) and phosphorus-containing groups (DOPO) have been synthesized through a hydrolytic condensation reaction. FTIR, NMR, and MALDI–TOF MS have been used to identify the structures of the DVPOSSs, which include T9, T10, and T11 cage structures. Polycarbonate (PC)/DVPOSSs composites can be achieved through simple twin-screw extrusion. The addition of DVPOSSs improves the haze of PC/DVPOSSs composites, while maintaining the high transmittance of PC control. The thermal properties and fire behavior of the PC/DVPOSSs composites have been investigated by TGA, DSC, cone calorimetry, and LOI and UL-94 tests. PC/DVPOSSs-2 and PC/DVPOSSs-4 attained a V-0 rating in 3.2-mm and 1.6-mm samples. The pyrolysis and flameretardant mechanisms of the PC/DVPOSSs composites have been assessed on the basis of TGA–FTIR, cone calorimetry, and char layer morphology results. The main flame-retardant mechanism is that DVPOSSs induce early decomposition of the PC matrix and increase char formation, rapidly extinguishing the flame and causing an obvious reduction in heat release rate.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Introduction Polycarbonate (PC) is the fastest growing general engineering plastic among the top five engineering plastics [1–3]. Due to its high transparency, good Handling Editor: Chris Cornelius.
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https://doi.org/10.1007/s10853-020-05235-9
dimensional stability, and high impact resistance, PC has become one of the most commonly used materials for transparent products, such as automotive lighting and light-emitting diode (LED) display diffuser sheets [4].
J Mater Sci
LED is a kind of solid-state semiconductor device that can convert electric energy into visible light [5]. At present, LED lamps have become the most important lighting system and display light source due to its good color reduction, durability, low power consumption, and environmental protection [6, 7]. LED is essentially a strong and concentrated point light source [8]. In real life, it is necessary to use light diffusion material (LDM) to convert strong light source into uniform and soft plane light source, so as to improve brightness uniformity and visual comfort, so as to achieve good application effect [9, 10], that is to reduce glare effect. This kind of light-diffusing material needs to be made of materials with high haze and high transparency. PC is used as LDM because of its high
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