阻燃PC／ABS共混体系的动态力学分析

通过熔融共混法制备了阻燃PC／ABS复合材料,分析了其动态力学性能,探讨不同相容剂、不同ABS组份等因素对复合材料的储存模量（E′）、损耗模量（E″）、损耗因子（tanδ）等动态力学参数的影响。结果发现使用丙烯酸树脂和苯乙烯马来酸酐无规共聚物组成的复合相容剂能够较好地改善阻燃PC／ABS的相容性,在玻璃化温度附近E′和E″适中;材料有着良好的刚性和韧性,综合力学性能优良。研究结果可为进一步优化阻燃PC／ABS产品配方提供依据。     

阻燃PC/ABS合金的研制及其在电器上的应用

通过对3种增容剂增容PC／ABS合金性能的测试对比,选用了1种效果最佳的增容剂制备PC／ABS合金．用十溴联苯醚和三氧化二锑作为阻燃体系,对阻燃PC／ABS合金的力学性能、热性能、阻燃性能进行了检测。结果表明,当PC：ABS：增容剂：阻燃体系为70：30：8：15时,阻燃PC／ABS合金的综合力学性能最好,阻燃性能达到UL 94V-0级．该合金已用于生产防火电器开关、插座面板系列产品。     

Investigation on phosphorus halogen‐free flame‐retardancy systems in short glass fiber‐reinforced PC/ABS composites under rapid thermal cycle molding process condition

In this study, standard test specimens with flame‐retarded short glass fiber‐reinforced PC/ABS materials were fabricated under rapid thermal cycle injection molding condition by selecting a potassium perfluorobutane sulfonate flame retardant specially used for PC, FR2025, and two kinds of aryl phosphorus halogen‐free flame retardants, UN707 and PX‐220. The flame‐retardancy effect of the above different flame retardants on the studied systems was compared through combustion tests of the specimens. Meanwhile, the thermal and mechanical properties of flame‐retarded composites were studied by using the thermogravimetry analysis, dynamic mechanical thermal analysis (DMTA), and universal testing machine. The results show that the “candlewick effect” of fibers exacerbates the fire behavior of composites. With the increase of the aryl phosphorus halogen‐free flame retardants, the flame‐retardancy effect of composites is obviously improved, and the maximum thermal degradation rate of composites is significantly decreased. The UL94 combustion rating is improved, and the time of residual flame is substantially reduced with the increase of PC content under the same content of flame retardant. The DMTA results show that the flame retardants have a reinforcement action on PC/ABS matrix. However, the macroscopic mechanical properties are slightly decreased in the glass fiber‐reinforced composites because of the destructive effect of the flame retardants on the interface compatibility between matrix and fibers; the scanning electron microscopic micrographs of tensile fracture fully prove this action mechanism of flame retardants. In addition, the addition of toughener and antidripping additive significantly affects the flame retardancy and mechanical properties of composites. POLYM. COMPOS., 36:1653–1663, 2015. © 2014 Society of Plastics Engineers     

Interactive effect of ammonium polyphosphate and montmorillonite on enhancing flame retardancy of polycarbonate/acrylonitrile butadiene styrene composites

The effect of two flame retardants [ammonium polyphosphate (APP) and montmorillonite (MMT)] was studied in relation to flame retardancy, mechanical properties and physical characteristics of polycarbonate (PC)/acrylonitrile butadiene styrene (ABS) blends. Moreover, the possible synergistic effect of these two flame retardant additives on the macromolecular blends was studied as well. Based on this research, it was revealed that APP- and MMT-raised loading has significantly increased the limiting oxygen index (LOI) of the resulting PC/ABS blends, which is due to the intumescence effect provoked by the incorporation of these flame retardant fillers. Incorporation of APP improved the LOI through intumescence effect while the addition of MMT led to intercalation of PC/ABS polymer matrix into the interlayer galleries of MMT particles. Besides, higher APP loading in PC/ABS blends has significantly promoted the formation of carbonaceous char residues as evidenced in TGA analysis, which indicates that addition of higher APP could improve thermal stability of PC/ABS blends. To improve the tensile strength and elongation-at-break, APP loading of 25 phr in PC/ABS blends together with various MMT loading would be suitable to ensure good dispersion and interfacial adhesion between the polymer chains and the additives. However, it is important to control the loading level of MMT as its excessive incorporation could result in flame-retarded PC/ABS blends with brittle behavior, showing weaker mechanical properties.     

磷酸酯类阻燃剂在PC／ABS合金中的应用

文章研究了磷酸酯类阻燃剂RDP、BDP以及它们与TPP的协同作用对PC／ABS合金的阻燃性能、热失重行为以及力学性能的影响。结果表明,PC／ABS合金的LOI随着阻燃和的增加而增加,当阻燃剂RDP和BDP添加量均为15％时,LOI达到最大值,分别为363％和35．3％,且均达FV-0级。通过热重分析表明,阻燃PC／ABS比纯PC／ABS合金的分解速率小得多。研究还表明,阻燃剂的协同作用使PC／ABS合金的阻燃性能优于添加单一阻燃剂的PC／ABS合金的阻燃性能。     

阻燃PC/ABS共混体系动态流变性能的研究

通过熔融共混法制备了阻燃PC/ABS复合材料,研究了其流变特性,探讨相容剂、剪切频率等因素对复合材料的动态储能模量、剪切损耗模量、损耗因子和复合黏度等动态流变参数的影响。结果表明:使用由丙烯酸树脂和苯乙烯-马来酸酐无规共聚物组成的复合相容剂,在加工条件下即角频率(ω)为12.6rad/s时,体系的复合黏度(η*)远小于PC的η*。     

分子筛对无卤阻燃PC/ABS合金性能的影响

采用分子筛与磷酸酯类阻燃剂(P-2)复配制备了高耐热、无卤阻燃聚碳酸酯(PC)/丙烯腈-丁二烯-苯乙烯塑料(ABS)合金.研究了4A分子筛、13X分子筛与P-2复配对Pc/ABs合金阻燃性能、力学性能、热稳定性能的影响.结果表明,分子筛与P-2的复配能有效地缩短PC/ABS合金余焰燃烧时间;分子筛使PC/ABS合金体系...     

无卤阻燃PC/ABS合金的研究进展

综述了近年来国内外采用无卤阻燃剂阻燃PC／ABS合金的研究进展。介绍了PC／ABS合金无卤阻燃剂的分类、阻燃机理及存在的一些问题和解决方法。重点介绍了有机磷系阻燃剂及其对PC／ABS合金的阻燃性能、热分解和机械性能等的影响,并指出了今后的研究重点和发展方向。     

PC/ABS合金的力学性能的研究

利用双螺杆挤出机对PC／ABS进行共混,并探讨了PC的质量分数、三种相容剂以及阻燃剂对PC／ABS合金性能的影响。结果表明,拉伸强度随PC含量增加而升高,弯曲强度与弯曲模量则下降,冲击强度则呈现先降后升的趋势;不同相容剂的加入对PC／ABS合金的力学性能均有不同程度的提高;三种阻燃剂中氮磷复合阻燃合金的效果最好。     

溴系阻燃剂阻燃ABS的制备及电性能研究

研究了十溴二苯醚(DBDPO)、四溴双酚A双(2,3-二溴丙基)醚(TBAB)及其复配对ABS阻燃性能及电性能的影响。结果表明,DBDPO与TBAB对ABS的阻燃有协同作用,在DBDPO与TBAB总用量固定为15％的条件下,两者的质量比为2：l时,氧指数达到最大值,为32．4。DBDPO及TBAB对ABS电性能均有一定损害,使ABS的电绝缘性能及电气强度降低、介电常数及介电损耗因数增加。     

无卤阻燃PC/ABS合金

通过阻燃性能、力学性能测试及场发射扫描电镜(FE-SEM)分析,研究相容剂、增韧剂、磷酸酯阻燃剂对PC/ABS合金阻燃及力学性能的影响,结果表明:相容剂A使ABS在PC中的颗粒尺寸减少,对PC/ABS体系相容性最好,但对合金的冲击性能提高有限.丙烯酸酯类增韧剂B的加入显著提高了PC/ABS合金的韧性.磷酸酯类阻燃剂虽然对PC/ABS合金具有很好的阻燃效果,但极大降低了合金的冲击性能,不同的加工工艺对合金的力学性能影响很大.     

复合阻燃剂/PET共混物的流变性研究

将复合阻燃剂/PET共混改性,其质量比为2%～7%。研究表明,复合体系为非牛顿假塑性流体,其表观黏度随剪切速率的增大而减小;随着复合阻燃剂含量增大,共混物非牛顿流动指数下降,剪切速率上升,流变性能改善;共混物的黏流活化能为78.3 kJ/mo1,黏温依赖性与普通PET相似。     

成分因素对PC/ABS合金暴露在烷基苯中力学性能的影响研究

通过万能拉伸试验机检测聚碳酸酯/丙烯腈?丁二烯?苯乙烯共聚物（PC/ABS）合金置于烷基苯后拉伸应变和拉伸强度的变化,研究了烷基苯对其力学性能的影响规律。结果表明,经过60 ℃烷基苯浸渍处理30 d后,分别添加了马来酸酐接枝低密度聚乙烯（PE?g?MAH）、马来酸酐接枝ABS（ABS?g?MAH）、甲基丙烯酸缩水甘油酯接枝乙烯?1?辛烯共聚物（POE?g?GMA）的PC/ABS的断裂拉伸应变变化率下降了58.8 %、25.4 %和41.3 %;相比于ABS,PC组分是导致断裂拉伸应变下降的一个关键因素;有效的相容剂能延长PC/ABS合金在类烷基苯溶剂中保持力学性能稳定性的时间;阻燃剂分散在PC/ABS体系中,在烷基苯渗透作用下更容易发生韧?脆行为转变。     

ABS/Nano-ATH复合材料性能研究

采用熔融共混法制备出了丙烯腈-丁二烯-苯乙烯共聚物(ABS)/纳米氢氧化铝(nano-ATH)复合材料,研究了nano-ATH的用量对复合材料力学性能和阻燃性能的影响,并利用扫描电镜分析了nano-ATH在ABS基体中的分散情况。结果表明:随着nano-ATH用量的增加,ABS/nano-ATH复合材料的冲击强度和拉伸强度均是先升后降,分别在nano-ATH含量为10%和5%时达到最大值;nano-ATH的加入可以提高ABS复合材料的阻燃性能和弯曲模量,但随其用量的增加,nano-ATH在ABS基体中的分散性逐渐变差。     

回收PC/ABS机壳材料的改性

为了实现聚碳酸酯(PC)/丙烯腈–丁二烯–苯乙烯塑料(ABS)回收资源的合理化应用,对回收PC/ABS机壳材料进行了增韧及阻燃改性研究。结果表明,回收PC/ABS机壳材料的加工温度越高,性能越差。在回收PC/ABS机壳材料中添加增韧剂能明显提高回收料的韧性,且添加具有增容作用的甲基丙烯酸甲酯–丁二烯–苯乙烯共聚物(MBS)比高胶粉增韧效果更明显,添加5%的MBS后综合力学性能最佳。添加阻燃剂能有效提高回收料的阻燃性能,同时添加十溴二苯乙烷的阻燃效果优于有机磷酸酯类阻燃剂。当添加质量分数5%十溴二苯乙烷时,回收PC/ABS材料的性能最佳,缺口冲击强度为10.9 k J/m~2,同时也可以达到1.6 mm的UL94 V–0级别。     

无卤阻燃PC/ABS合金性能及应用

通过非等温热失重方法对无卤阻燃剂双酚A双磷酸二苯酯(BDP)和Sb2O3及其复配体系,以及采用该类阻燃剂的聚碳酸酯(PC)/(丙烯腈/丁二烯/笨乙烯)共聚物(ABS)合金的热分解行为进行了研究;同时,对采用该类阻燃剂的PC/ABS合金的力学性能、阻燃性能进行了研究,并通过扫描电镜对加入BDP的PC/ABS合金的微观结构进行了研究.结果表明,BDP/Sb2O3为7/3、质量分数为10%时,合金的综合性能优良,氧指数达到29.5%,缺口冲击强度达到84.23 kJ/m2>;BDP对PC/ABS合金具有一定的增容效果.合金可用于汽车行业、电子电器等行业.     

Flame retardancy,thermal, rheological,and mechanical properties of polycarbonate/polysilsesquioxane system

The polymethylphenylsilsesquioxane (PMPSQ) microspheres were used as an additive for the injection‐molding of polycarbonate (PC) in order to obtain a flame retardant polymer and to damage the other properties of PC as low as possible. The results showed that PMPSQ microspheres were a kind of effective flame retardant by the LOI test and the flame retardancy of PC increased with the increase of PMPSQ content. Thermogravimetric analysis suggested that the PMPSQ could induce crosslinking reactions and accelerate the thermal degradation of PC, sequentially promote the formation of the residue char during degradation. Differential scanning calorimetry measurement showed that the glass transition temperature of PC/PMPSQ system was decreased with the increase of PMPSQ content, which maybe caused by the enlarged free volume of PC‐rich phase. The rheological behaviors including dynamic and steady modes, combined with the analysis of scanning electron microscopy photographs, exhibited that the dispersion and compatibility of PMPSQ in the PC matrix decreased the viscosity of the systems and the addition of PMPSQ microspheres improved the processability of PC, but still there exist aggregation of PMPSQ microspheres in PC matrix, which gave a higher impact strength but a lower flexural modulus and elongation at break than pure PC. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

磷酸酯与纳米蒙脱土协同阻燃PC/ABS合金的研究

研究了多芳基磷酸酯PX220与纳米蒙脱土复配阻燃剂对聚碳酸酯(PC)/丙烯腈-丁二烯-苯乙烯(ABS)合金的阻燃性能、热失重行为、力学性能及热变形温度的影响;并采用锥形量热仪对合金材料的燃烧性能进行测定。结果表明:PX220添加量为10份,纳米蒙脱土添加量2份时,PC/ABS合金的极限氧指数达到29%,燃烧性能达到UL 94V-0级。锥形量热仪分析结果表明:复配阻燃PC/ABS合金的热释放速率峰值、平均热释放速率、总释放热、平均有效燃烧热和平均质量损失速率都大幅下降,说明PX220与纳米蒙脱土具有非常好的协同阻燃作用。     

Compatibility enhancement of ABS/polycarbonate blends

The effects of blend composition, melt viscosity of poly(acrylonitrile-butadiene-styrene) (ABS), and compatibilizing effect of poly(methyl methacrylate) (PMMA) on mechanical properties of ABS/polycarbonate (PC) blends at ABS-rich compositions were studied. As the content of PC was increased, impact strength and Vicat softening temperature (VST) were increased. As the melt viscosity of ABS was increased near to that of PC, finer distribution of dispersed PC phase and consequent enhanced impact strength and VST were observed. The compatibilizing effect of PMMA can be ascer-tained from the enhanced properties of ¼-inch notch impact strength, VST, tensilestrength, and the morphology observed by a scanning electron microscope. The improved adhesion of the ABS/PC interface by PMMA changed the fracture mechanism and reduced the notch sensitivity of blends. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 533–542, 1998     

Effect of matrix SAN in ABS/PMMA blends

The effect of the molecular weight and acrylonitrile (AN) content of the styrene–acrylonitrile copolymer (SAN) on the morphology, mechanical properties, and rheological properties of acrylonitrile–butadiene–styrene terpolymer/poly(methyl methacrylate) (ABS)/PMMA (60/40 by weight) blends were studied. When the AN content of matrix SAN (32%) was close to that of graft SAN (30%) AN, rubber particles existed separately. However, with matrix SAN having 35% AN, rubber particles showed tendency to agglomerate each other. With increasing molecular weight of matrix SAN, impact strength, ultimate elongation, and abrasion resistance of the blend generally increased. Yield strength increased with molecular weight at a constant AN content of matrix SAN, and it decreased with the decrease of AN content in spite of the increasing molecular weight of SAN. Melt properties, rather than the morphological and mechanical properties, were more sensitive to the AN content, rather than the molecular weight of matrix SAN. © 1994 John Wiley & Sons, Inc.