PMMA及AS在ABS高胶粉增韧回收ABS改性中的应用研究

利用聚甲基丙烯酸甲酯(PMMA)及丙烯腈-苯乙烯共聚物(AS)对经丙烯腈-丁二烯-苯乙烯(ABS)高胶粉增韧的回收ABS进行改性.研究表明,PMMA及AS均可以提高共混物的拉伸强度、弯曲强度及硬度,而冲击强度呈下降趋势,但除冲击强度及熔体质量流动速率外,添加PMMA的共混体系的力学性能等方面的指标优于添加AS的体系.     

ABS/AS复合材料的制备及其在乒乓球中的应用

制备了丙烯腈-丁二烯-苯乙烯树脂/苯乙烯-丙烯腈共聚物(ABS/AS)复合材料,研究了AS的用量对复合材料力学性能、耐热性、表面光泽度及耐磨性的影响。结果表明:随着AS用量的增加,复合材料的邵氏硬度D和冲击强度逐渐增大,维卡软化点逐渐升高,接近于AS的维卡软化点110oC;AS的加入改善了样品的表面光泽度,在AS用量为15%时达到最大值,继续添加AS,样品的表面光泽度下降。随着AS用量的增加,ABS/AS复合材料的耐磨性有所改善。SEM结果表明,AS可以与ABS形成较好的黏合作用,摩擦外力对于材料表面的形貌影响较小。     

橡胶含量对ABS树脂性能的影响

采用聚丁二烯接枝苯乙烯-丙烯腈共聚物(PB-g-SAN)与苯乙烯-丙烯腈共聚物(SAN)熔融共混,制备了一系列丙烯腈-丁二烯-苯乙烯共聚树脂(ABS),考察了橡胶含量对该ABS树脂物理力学性能的影响。结果表明:随着橡胶含量的增加,ABS树脂的拉伸强度、弯曲强度、弯曲模量、熔体流动速率、热变形温度、密度和硬度均有所降低,而缺口冲击强度和断裂伸长率提高。因此可通过调节橡胶含量来制备具有不同物理力学性能的ABS树脂,以满足不同的应用需要。     

丙烯腈含量对ABS树脂性能的影响

通过乳液接枝聚合法合成丙烯腈-丁二烯-苯乙烯共聚物(ABS)接枝粉料,与苯乙烯-丙烯腈共聚物(SAN)树脂熔融共混得到ABS树脂。探究丙烯腈含量对ABS树脂性能的影响。结果表明：随着丙烯腈含量增加,ABS树脂的拉伸强度、冲击强度、耗散因数、体积电阻率、维卡软化温度以及两相之间相容性上升,但熔体流动速率、表面电阻率、介电常数下降。     

ABS/PMMA合金制备及性能

采用双螺杆挤出机熔融共混的技术方法,以中国石油吉林石化公司自产丙烯腈-丁二烯-苯乙烯共聚物(ABS)及聚甲基丙烯酸甲酯(PMMA)为原料,研究不同工艺条件对ABS/PMMA合金性能的影响。结果表明,熔融共混后,ABS与PMMA形成了新合金。同时考察了加入苯乙烯三元共聚物(MBS)对ABS/PMMA合金相容性的影响,结果表明,加入MBS后可有效改善合金的相容性。     

高光免喷涂ABS/PMMA合金研究进展

综述了高光免喷涂丙烯腈-丁二烯-苯乙烯塑料(ABS)/聚甲基丙烯酸甲酯(PMMA)合金的研究进展,介绍了ABS和PMMA的种类和配比对合金性能的影响,以及增容剂在改善ABS和PMMA界面相容性、提高合金力学性能和表面硬度方面的作用。并介绍了PC等塑料和无机填料等在ABS/PMMA合金中的应用以及对合金性能的影响。     

PMMA/SAN/ABS共混物的结构与性能研究

采用乳液聚合技术合成丙烯腈-丁二烯-苯乙烯(ABS)接枝粉料,将制得的ABS接枝粉料与聚甲基丙烯酸甲酯(PMMA)/苯乙烯-丙烯腈共聚物(SAN)熔融共混,制备透明ABS树脂。研究了体系橡胶含量,接枝粉料壳层组成,基体组成对透明ABS树脂结构与性能的影响。结果表明,随着体系橡胶含量的增加,共混物的冲击强度增大,透光率略有降低;壳层组成为75/25的共混物具有较高的韧性和透明性;随着基体PMMA/SAN组成的增加,共混物的冲击强度基本不变,而透光率先增大后减小。透射电子显微镜(TEM)研究表明,壳层组成为75/25的橡胶粒子能均匀地分散在基体中。     

ABS/PMMA共混物在注塑成型加工中性能和微观结构的变化

以丙烯腈-丁二烯-苯乙烯共聚物/聚甲基丙烯酸甲酯(ABS/PMMA)共混物为研究对象,以注塑成型加工工艺条件为主要研究内容,考察了工艺条件的改变对共混物力学性能和微观结构的影响,并确定了适宜的加工工艺条件。研究结果表明:注射温度对ABS/PMMA共混物的弯曲强度有较大的影响,而对冲击性能和拉伸性能的影响不明显;注射压力对共混物的冲击性能有所影响,而对其拉伸性能的影响不明显。     

胶含量对SAN/ABS共混物的结构与性能的影响

采用乳液聚合技术合成聚丁二烯胶乳,然后在聚丁二烯胶乳粒子上接枝苯乙烯和丙烯腈单体制备ABS粉料,通过熔融共混法制备了苯乙烯-丙烯腈/丙烯腈-丁二烯-苯乙烯(SAN/ABS)共混物。对共混物进行了力学性能测试,结果表明:随着橡胶含量的增加,共混物的断裂伸长率先上升后下降,冲击强度增大。采用转矩流变仪和扫描电镜(SEM)对共混物的加工流变性能和共混物的相形态进行了表征,结果表明:胶含量为25%时,加工流动性较好,橡胶粒子能较均匀地分散在基体中,能较好地改善体系的抗冲击性。     

ABS/SAN/中粘度PMMA三元共混物的性能研究

制备不同配比的丙烯腈－丁二烯－苯乙烯（ABS）／苯乙烯－丙烯腈（SAN）／中粘度聚甲基丙烯酸甲酯（PMMA）合金，分别测试其缺口冲击强度、拉伸强度、热变形温度、熔体流动指数等，结果表明：ABS／SAN可以引发中粘度PMMA产生大量的银纹，从而大幅度提高共混物的冲击强度；引入中粘度PMMA可以提高ABS／SAN的耐热性能；添加中粘度PMMA，合金的流动性能呈现下降的趋势。     

防划伤高光ABS/PMMA合金的制备及其性能探讨

以ABS为主要原料与PMMA共混来改善ABS的表面光泽度,添加无机填料TiO2和BaSO4来改善ABS/PMMA合金的表面硬度,探讨了PMMA和无机填料含量对ABS/PMMA合金力学性能、光学性能和硬度的影响。结果表明:合金的表面光泽度和硬度随着PMMA含量的增加而增大,但过多的PMMA会降低合金的冲击性能,当PMMA/ABS=30/70时,合金综合性能最佳;加入无机填料后,合金的表面硬度上升,表面光泽度、拉伸强度和冲击强度下降。     

Miscible and immiscible blends of ABS with PMMA. II. Mechanical and surface properties

Mechanical and surface properties of injection-molded specimens for miscible and immiscible blends of ABS with PMMA were investigated. Regardless of miscibility, hardness, modulus, and strength of the blends generally showed a smooth variation with composition, with the possible exception of impact strength. In miscible blends, impact strength decreased smoothly with PMMA; however, in immiscible blends, a drastic drop to less than the half that of ABS was obtained at 10 wt % PMMA. Compounding at higher temperature gave decreased modulus and strength and increased impact strength. Surface gloss decreased with PMMA addition in the miscible system and increased in the immiscible system up to 50 wt % PMMA. From contact-angle and FTIR measurements, it is suggested that the surface properties are governed by miscibility and the viscosity ratio of the components. © 1993 John Wiley & Sons, Inc.     

CPVC/PMMA共混体系的性能研究

制备了氯化聚氯乙烯/聚甲基丙烯酸甲酯(CPVC/PMMA)共混材料,研究了PMMA的引入对CPVC/PMMA共混体系的力学性能、耐热性能、表面光泽度、加工流动性和微观结构的影响。结果表明:适量PMMA的引人,使CPVC/PMMA共混体系的缺口冲击强度和光泽度较纯CPVC显著提高,耐热性能亦有所改善,而拉伸强度下降不明显;塑炼过程中,CPVC/PMMA共混体系熔体的平衡扭矩降低,凝胶化时间减少。当PMMA含量为15 phr时,CPVC/PMMA共混体系具有最佳综合性能,此时该共混体系的缺口冲击强度为5.4 kJ/m2,拉伸强度为53.5 MPa,表面光泽度为82.3%,热变形温度为102.4℃,平衡扭矩为20.1 N·m。     

Poly(methyl methacrylate) toughened by ethylene‐vinyl acetate copolymer: Physico‐mechanical,thermal, and chemical properties

Blends of poly(methyl methacrylate) (PMMA) with different composition viz., 5, 10, 15, and 20 wt % of ethylene‐vinyl acetate (EVA) copolymer were prepared by extrusion in a corotating twin screw extruder. These prepared PMMA/EVA blends have been characterized for physicomechanical properties such as density, surface hardness, izod impact strength, tensile strength, tensile elongation, and tensile modulus. The chemical aging and heat aging tests were performed on the blends by exposing them to different chemical environments and to 80°C for 168 h respectively. The influence of chemical aging and heat ageing on the mechanical performance of PMMA/EVA blends has been studied. The PMMA/EVA blends were also characterized for thermal properties such as vicat softening point (VSP) and melt flow index (MFI). That means significant improvement in impact strength of PMMA was noticed after incorporation of EVA into PMMA matrix and it lies in the range 19.1–31.96 J/m. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Ethylene Methacrylate (EMA) Co-polymer Toughened Polymethyl Methacrylate Blends: Physico-mechanical,Optical, Thermal and Chemical Properties

Polymethyl methacrylate (PMMA) was blended with ethylene methacrylate (EMA) copolymer in different compositions by melt mixing technique using Haake Rheochord twin screw extruder. The physico-mechanical, thermal, optical and chemical properties of PMMA/EMA blends were investigated with special reference to the blend compositions. The impact strength of the blends was found to increase significantly with increase in EMA content, without affecting the optical properties significantly. Optical micrograph images of the blends reveals that the rubbery phase dispersed as domains in the continuous PMMA matrix at 5 and 10 wt. % addition of EMA. The PMMA/EMA, 80/20 blend was found to exist as co-continuous system. Attempts have been made to correlate changes in morphology with mechanical properties. The influence of chemical ageing and heat ageing on the mechanical performance of PMMA/EMA blends has been studied. Four composite models such as series model, parallel model, Hapin-Tsai and Kerner's model have been used to fit the experimental tensile strength, tensile modulus and surface hardness.     

ABS／SMA及ABS／SMA／PMMA的性能研究

研究了ABS／SMA和ABS／SMA／PMMA共混体系,确定了配比与合金的拉伸强度、冲击强度、断裂伸长率、模量、热变形温度、熔体流动速率等关系。结果表明：①ABS中引入SMA可以显著提高耐热性能,但同时合金的缺口冲击强度严重降低;②ABS中引入SMA可使合金的流动性能提高;③ABS／SMA体系中引入第三组分PMMA可以大幅度提高共混物的缺口冲击强度,同时使合金的耐热性能有所提高。     

HTPB/液化MDI型PU与PMMA的共混研究

用同步聚合法制备了一系列HTPB／液化MDI型PU与PMMA的共混材料，分别用FTIR、DSC、SEM和拉力实验机对共混材料的反应进度、玻璃化转变温度、力学性能和微观形态进行了考查和研究；结果表明，体系中PMMA优先于PU聚合，共混材料的玻璃化转变温度Tg2随PMMA质量分数的增加略呈上升趋势；材料的拉伸强度和硬度均随体系中PMMA质量分数的增加而增大，断裂伸长率则逐渐减小；体系微观呈两相分离，当PMMA占50％时，相畴最小。     

Effect of ultrasonic oscillations on weld line strength of PS,PMMA, and their blends

The effect of ultrasonic oscillations on the weld line strength of amorphous polystyrene (PS), polymethyl methacrylate (PMMA), and PS/PMMA (20/80, 50/50, 80/20) blends at various temperatures was investigated. By facilitating the molecular diffusion across the weld line, the introduction of ultrasonic oscillations could evidently improve the weld line strength of PS, PMMA, and their blends. The different effects on the weld line strength of PS/PMMA (20/80, 50/50, 80/20) blends were investigated. The ultrasonic oscillations could greatly increase the weld line strength of PS/PMMA (80/20) by ～ 70%, but was less efficient to PS/PMMA (50/50, 20/80) blends, due to the great difference of weld line morphologies of these blends. The dispersed phase of PS/PMMA (80/20) in the weld line was spherical while two different morphologies in the weld line of PS/PMMA (50/50) were observed. And the stripe‐like morphology of PS perpendicular to the flow direction in the weld line of PS/PMMA (20/80) is responsible for the little effect of ultrasonic oscillations. The fractured surfaces of PS, PMMA, and PS/PMMA (80/20) with weld line became much rougher due to the introduction of ultrasonic oscillations. The morphology study of PS/PMMA (80/20) showed that the spherical dispersed phase of PS/PMMA at the skin turned smaller under ultrasonic oscillations. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2990–2997, 2006