以双酚A双(二苯基磷酸酯)(BDP)和全氟丁基磺酸钾(PPFBS)为阻燃剂,甲基丙烯酸甲酯-丁二烯-苯乙烯三元嵌段共聚物(MBS)为增容增韧剂;采用熔融共混挤出的方法,通过调节聚碳酸酯(PC)的含量,制备高耐热无卤阻燃聚碳酸酯(PC)/丙烯腈-丁二烯-苯乙烯(ABS)合金.结果表明,当质量分数8％的BDP和0.05％的PPFBS复配时,材料的阻燃等级可以达到2.0 mmV-0;PC含量为85％时,材料的热变形温度可以达到102.5℃,同时,具有优异的力学性能.

A rare-earth phosphor powder filled polycarbonate ( PC) resin was prepared by melt-extrusion method and rolled into a fluorescent PC film by open mill.X-ray diffraction, scanning electron microscope and fluorescence spectroscopy was applied to characterize the structure and performance of the phosphor powder and the fluorescent PC film.The fluorescent PC film was combined with the blue LED chip and its color and luster properties were measured by optical spectrometer.The results showed that the rare-earth phosphor powder filled PC resin exhibited good compatibility between rare-earth phosphor powder and PC resin.The phosphor powder could uniformity dis-persed in the PC resin.The rare-earth phosphor powder with larger size crystal was conducive to maintain a stable crystal structure and morphology in the processing.The excitation-emission wavelength of the phosphor could be re-mained after processing.However, the optical efficiency of the white LED was significantly influenced by the parti-cle size of the phosphor.The color rendition index was gradually increased, with increasing of relative proportion of blue light and yellow light in the synthetic white light.

文章通过点胶法和荧光树脂法制备了两种白光LED,对其色温、显色指数及光效等性能进行了对比研究.结果表明:挤出加工过程对0754荧光粉的晶体结构破坏明显,从而导致荧光树脂法白光LED光效低于点胶法白光LED光效,但对YAG-5荧光粉晶体结构影响不大,荧光粉在荧光树脂中的良好分布明显提高了白光LED的综合性能.荧光粉浓度为30％,荧光树脂厚度0.2 mm时,白光LED光效最大;荧光树脂白光LED工作5000 h后仍能保持较高光效,耐老化性能良好.

以磷酸三苯酯(TPP)与氰尿酸三聚氰胺盐(MCA)为复配阻燃剂,经过熔融挤出法制备了无卤阻燃聚苯醚与聚苯乙烯合金(MPPO)材料,通过增加聚苯醚(PPE)和通用聚苯乙烯(GPPS)的含量以及加入DENGKA树脂(IP树脂),改善了该无卤阻燃体系的热变形性能,并对比了复合体系的熔体流动性的变化.结果表明,加入质量分数为10％的IP树脂,能很好地提高无卤阻燃MPPO体系的热变形温度,同时,改善复合体系熔体流动性.

Nowadays,Glass fiber(GF) reinforced polypropylene(PP) composites have been widely applied in electronic and automobile field,but its performance are still lower than AS/GF composites,can’t be used in the wind wheel of air conditioning.Based on preliminary study of PP/grafted PP(g-PP) /GF composites,four types of powder reinforced materials were applied to the composites,study of the effects of type and content of powder reinforced materials and nuclear agent on the mechanical properties,melt flow rate(MFR) and heat distortion temperature(H.D.T.) of the composites were carried out.Result showed that the four types of selected powder reinforced material can effectively improve the mechanical properties of the composites,and the effect of CaSO4whisker was the best.When the weight ratio of CaSO4 whisker to PP was 1∶4,the mechanical properties of the PP/g-PP/27 % GF/CaSO4 composite have completely reached AS/GF composite level.Nuclear agent can further improve the reinforce effect of CMS777 and ZC3000A on the PP/g-PP /27 % GF composites.The new hybrid reinforced composites were expected to replace AS/GF composites and could be used in the wind wheel of air conditioning.

A glass fiber(GF) reinforced composites were prepared by introducing the grafted polypropylene(g-PP) to polypropylene(PP)/GF composites.Effects of the g-PP dosage and GF content on the mechanical properties,heat distortion temperature and melting flow rate of PP/GF composites were studied in detail.The study showed that mechanical properties and heat distortion temperature of PP/GF composite could be improved significantly by the g-PP,tensile strength of PP/g-PP/GF composites were closed to AS/GF composite when the g-PP content was adequate,impact strength and heat distortion temperature are much higher,the g-PP had no significant effect on its melt fluidity.Brittle-ductile transition of PP/GF composites was happened when appropriate amount of the g-PP was added Crystallization temperature of PP/GF composites was improved and spherocrystal sizes were reduced by the g-PP The new glass fiber reinforced composites are expected to replace AS/GF composites and could be used in the wind wheel of air conditioning.

With ABS-g-MAH,POE-g-MAH and SMA as compatibilizers,the influence of the compatibilizers′species,content of compatibilizers,content of toughening agents and screw speed of extruder on the mechanical properties of PA6/ABS alloy were investigated.The experiment result indicated that ABS-g-MAH was the most effective compatibilizer for PA6/ABS alloy and the notched impact strength of the alloy with 20%ABS-g-MAH was the highest.PA6/ABS alloy with excellent mechanical properties was obtained by using ABS-g-MAH and POE-g-MAH as compatibilizers and toughening agent separately.The notched impact strength of PA6/ABS alloy would be increased when the screw speed of extruder reduced.

In this study the effect of screw configuration on the mechanical properties of glass fiber reinforced PA66/PA6 alloy at given processing temperature,screw speed,and feed speed was investigated.By adjusting the screw configuration,the tensile,bending,and impact strengths of the glass fiber reinforced PA66/PA6 alloy were increased from 56 MPa,100 MPa,and 64 J/m to 169 MPa,238 MPa,and 136 J/m,respectively.

The effect of different screw assemblies on the extruding process and mechanical properties of glass fiber reinforced styrene-acrylonitrile copolymer(AS) was studied,and a suitable type of screw assembly for reinforced AS was designed.The results showed that the proper screw assembly could improve the extruding process and upgrade the mechanical properties of the reinforced AS.By improving melting and shear effect of the screw assemblies,the tensile strength and flexural strength of glass fiber reinforced styrene-acrylonitrile copolymer were improved obviously,from 105MPa and 115MPa to 116MPa and 125MPa respectively.Moreover,it ensured the production of equipment.The quality of product met the requirements of home appliances manufacturing enterprises at home and abroad.

Effect of melting temperatures on heterogeneous nucleation of polypropylene (PP) nucleated with different nucleating agents was investigated by DSC. For the pure PP, the peak temperature of crystallization was little change with increasing the melting temperature, indicating that nucleation of PP is thermal stable. For the PP nucleated with an organic phosphate (PPA), the peak temperature of crystallization and heat of crystallization of PP were higher than that of pure PP and were little influenced with increasing the melting temperatute. For PP nucleated with two kinds of sorbitol derivatives (PPB and PPD), the peak temperature of crystailization and heat of crystallization of PP decreased with increasing the melting temperature. These results indicate that the thermal stability of heterogeneous nucleation of PP nucleated with nucleating agent A is higher than that of nucleating agent B and D.

The non-isothermal crystallization behavi or and melting characteristics of polypropylene(PP) nucleated by different nucle ating agents were studied by DSC. Compared with pure PP, nucleated PP shows a hi gher crystallization temperature, more narrow half-height width of crystalliz ation peak, a little higher melting point and degree of crystallinity, wider hal f-height width of melting peak; but the shape symmetry of their crystallization peaks is worse. The dependence of crystallization temperatures of nucleated sam ples on the cooling rate is weaker than pure PP. According to the supercooling degree and the difference of the crystallization temperature between PP and nucl eated PP, the order of nucleating effect of nucleating agents: A＞D.

用差示扫描量热计(DSC)研究了聚丙烯(PP)中不同类型成核剂的异相成核作用的热稳定性,观察到随扫描次 数增加,纯PP的成核作用稳定,降温结晶温度基本不变.而有机磷酸盐类成核剂成核PP的结晶温度比纯PP的高, 而且异相成核作用受DSC扫描次数的影响也很小.但山梨醇类成核剂成核PP的异相成核作用随DSC扫描次数增加,结晶温度逐步降低,表明其异相成核作用对热不稳定.