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optical plastics PMMA and PS features
1, poly methacrylic acid 甲脂（Polymethyl methacrylate 简称PMMA, 也称Acrylic（亚克 force ））, rate nd=1.491, color dispersion 系数Vd=57.2, rate 约92%, accelerated aging rear 240H透 rate still can to 92%, in outer use 10 year rear drop to 88%, can 透 波 long 270nm above outer light. PMMA can X射线 and Y射线, its thin sheet/slice can 透 α射线 and β射线, is can absorption in 子线. PMMA density is 1.19kg/m3, in 20℃时 平均 water absorption is 2%, PMMA 线形膨胀系数 is 8.3*10-5 K-1, PMMA玻璃化转变 temperature degree is 105℃（120℃）, temperature degree is 180℃. PMMA currently 于广泛 by used for manufacturing versus machine, 摄录一体 machine, machine, light 盘读出头以 and use and made system in non 球面透镜 and 反射镜, also use manufacturing 菲涅尔透镜, micro 透镜数组, 隐形眼镜, 人工晶体, light 纤, light sheet/plate and other parts.
2, polystyrene (PS) (Polystyrene 简称PS,也称Styrene)
PS resistant property can 都不如PMMA, it rate high, nd=1.59-1.660, 阿贝系数 small Vd=30.8, therefore PS color dispersion large. PS透 rate is 88%, di rate relatively large, in cationic light function lower polystyrene (PS) easy 变黄, wet property small is 0.02%. PS heat deflection temperature (HDT) is 70-98℃, and formulation and rear has 关, it most high use temperature degree is 60-80℃, PS thermal conductivity temperature degree 发生变化, therefore can as good cold hot material. PS is most resistant polymer 之一, need combined property can 发生变化 must add very a large amount of can. PS remove and PMMA组 formed Color Difference outer also used for made light parts. is improvement PS property can, development 出一 改良 product types,如由70% polystyrene (PS) and 30% and acrylic copolymer formed new optical plastics NAS, types copolymer is acrylonitrile — styrene copolymer is SAN, main/primary use in engineering plastics products, optical upper main/primary used as 窗口, basic maintain PS transparent degree,但 still has trend,nd=1.567, most high use temperature degree 75-90℃, heat deflection temperature (HDT) 82-105℃,线形膨胀系数(6.5—6.7)* 10-5 K-1, density is 1.06kg/m3-1.08kg/m3.
above inner main/primary 参考百 degree 百科 and 百 degree 文库.
