相容剂SEBS-g-MAH对回收HIPS、ABS的共混物流变性能的影响

以苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物接枝马来酸酐(SEBS-g-MAH)为相容剂制备了回收高冲击强度聚苯乙烯(HIPS)和丙烯腈-丁二烯-苯乙烯共聚物(ABS)的共混物。利用熔体质量流动速率试验机和毛细管流变仪分析研究了该HIPS/ABS/SEBS-g-MAH共混物的流变行为。结果表明:在测试温度、应力条件下,该HIPS/ABS/SEBS-g-MAH共混物均为假塑性流体;随着相容剂SEBS-g-MAH用量的增加,共混物的非牛顿指数和黏流活化能均先增大后减小,且在相容剂SEBS-g-MAH用量为15 phr时达到最大值。     

PA6/ABS的结构与力学性能研究

采用熔融共混法制备了苯乙烯-马来酸酐共聚物(SMA)增容的聚酰胺6/丙烯腈-丁二烯-苯乙烯共聚物(PA6/ABS)共混物,用扫描电镜(SEM)对PA6/ABS共混物结构进行了表征.结果表明,随着SMA含量的增加,PA6/ABS共混体系的橡胶相粒径减小.橡胶颗粒的多分散系数保持不变,基体层厚度逐渐减小;PA6/ABS共混体系的脆韧转变温度随SMA含量的增加先减小后增加.     

ABS/HIPS共混材料的改性研究

研究了(丙烯腈/丁二烯/苯乙烯)共聚物(ABS)与高抗冲聚苯乙烯(HIPS)质量比对ABS/HIPS共混材料力学性能和加工流动性的影响,并着重对质量比分别为80/20和70/30的两种ABS/HIPS共混材料进行了改性研究。结果表明,氯化聚乙烯(PE-C)、(苯乙烯/丁二烯/苯乙烯)嵌段共聚物(SBS)和K树脂对ABS/HIPS共混材料有不同程度的增容增韧改性作用。如采用9份PE-C与3份SBS并用改性的ABS/HIPS(70/30)共混材料的拉伸强度为27.04MPa,冲击强度为32.60kJ/m2,比改性前约提高2.7倍。转矩流变仪分析表明,PE-C、SBS和K树脂改性的ABS/HIPS共混材料加工流动性和稳定性良好。维卡软化温度测试表明,改性后ABS/HIPS共混材料的耐热性能略有降低,但影响不大。扫描电子显微镜照片清晰反映出改性后ABS与HIPS两相的相容性得到了改善。     

相容剂种类对PA6/ABS合金性能的影响

采用苯乙烯-马来酸酐(SMA)、苯乙烯-丙烯腈-马来酸酐(SAMAH)和苯乙烯-丙烯腈-甲基丙烯酸(SAMAA)三种共聚物增容尼龙6/丙烯腈-丁二烯-苯乙烯共聚物(PA6/ABS)共混物,利用双螺杆挤出机制备出PA6/ABS合金,对其结构及其性能进行了表征和探讨。结果表明,三种相容剂均可有效地增容PA6/ABS合金,改善ABS在PA6中的分散,大幅度提高了缺口冲击强度;通过差示扫描量热(DSC)分析发现PA6/ABS的结晶度降低,结晶速率变慢;同时通过流变实验发现PA6/ABS共混物为假塑性流体,三种相容剂均提高了其表观黏度。     

不同改性剂对ABS复合材料力学性能的影响

通过在丙烯腈-丁二烯-苯乙烯共聚物(ABS)中添加不同的改性剂制备ABS复合材料。采用动态力学分析仪,扫描电子显微镜等分析了不同改性剂对ABS复合材料力学性能的影响。结果表明:与未改性的ABS相比,ABS/苯乙烯-马来酸酐共聚物(SMA)复合材料的拉伸强度为51.5 MPa,提高了6.8%;SMA作为相容剂提高了热塑性聚氨酯弹性体(TPU)粒子与ABS树脂之间的界面黏结强度,使得ABS/SMA/TPU复合材料的力学性能得以提高,其拉伸强度达到52.2 MPa,ABS/SMA/ABS高胶粉复合材料的冲击强度为29.3 kJ/m~2,提高了34.4%,综合力学性能较为理想。     

PA6/ABS/SMA/OMMT共混物的结构与性能研究

研究了有机蒙脱土(OMMT)对尼龙6(PA6)/丙烯腈-丁二烯-苯乙烯(ABS)/苯乙烯-马来酸酐共聚物(SMA)合金体系聚集态结构及性能的影响。实验表明:OMMT的加入提高了PA6/ABS合金体系的强度及模量,但加入OMMT后共混物的韧性有所下降。TEM的分析结果表明:对PA6/ABS/SMA/OMMT共混物,OMMT用量小于2份时,PA6/ABS/SMA/OMMT共混物中OMMT基本以剥离形态分布。     

PET/ABS/SMA共混物流变性能的研究

以苯乙烯接枝马来酸酐共聚物(SMA)为增容剂对聚对苯二甲酸乙二醇酯(PET)/丙烯腈-丁二烯-苯乙烯(ABS)共混物进行研究;采用熔体质量流动速率试验机和毛细管流变仪研究了PET/ABS/SMA共混物的流变行为,并对其lgγw～lgτw、lgηa～lgγw、lgηa～1/T曲线进行了分析。结果表明:在260～266℃及剪切应力为24.5～73.5 MPa时,PET/ABS/SMA共混物均为假塑性流体;增容剂SMA的加入明显地降低了共混物的非牛顿指数(n),并且使PET的黏流活化能(ΔE)较大幅度的升高,但过量的SMA会使ΔE下降。随着SMA的增加,共混物的黏度先增加后减小,SMA用量达到5%时,达到最大值。     

BR/EVA/HIPS TPV的制备和性能研究

采用苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)改善BR/乙烯-乙酸乙烯酯共聚物(EVA)/高抗冲聚苯乙烯(HIPS)共混物的界面相容性,通过动态硫化法制备BR/EVA/HIPS TPV,并对其性能进行研究.结果表明:未加入SBS的BR/EVA/HIPS共混物未表现出橡胶类弹性体特征,而加入适量SBS的共混物表现出典型橡胶类弹性体特征;当SBS用量为8～12份时,BR/EVA/HIPS TPV的综合物理性能较好,拉伸断面平滑,界面相容性良好.     

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.     

PA6/ABS共混物性能研究

将聚酰胺6（PA6）与市售的丙烯腈-丁二烯-苯乙烯（ABS）树脂共混,制备PA6/ABS共混物。研究了ABS树脂的用量对PA6/ABS共混物力学性能的影响;采用苯乙烯及丙烯腈共聚物（SAN）和ABS粉料熔融共混制得不同胶含量的ABS/SAN共混物。研究了不同胶含量的ABS/SAN共混物对PA6/ABS共混物力学性能的影响。在PA6/ABS/SAN共混物中引入苯乙烯-丙烯腈-马来酸酐共聚（SAM）树脂取代部分SAN树脂,研究了SAM树脂的加入及引入顺序的不同对共混物性能的影响。结果表明, ABS树脂的用量在50%～60%左右时共混物性能最佳。随ABS/SAN共混物胶含量提高,共混物的拉伸强度、弹性模量、弯曲强度和弯曲模量逐渐降低。随SAM树脂替代SAN量增加,共混物的拉伸和弯曲性能先降低后增加。但共混物熔体流动速率降低明显,而SAM树脂的引入顺序对共混物的力学性能影响不大。     

Super HIPS: improved high impact polystyrene with two sources of rubber particles

Significant improvements in impact strength were achieved in polystyrene blends that combined conventional HIPS particles in combination with particles produced by compositional quenching. A commercial HIPS was solvated and blended with additional polystyrene, rubber and diblock copolymer, and the mixture was flash devolatilized to give the end-product. Impact strengths of injection and compression molded samples and tensile properties are reported. It is known that the best impact modified polystyrene obtained by compositional quenching, here called aHIPS, has smaller and lower modulus rubber particles than conventional HIPS, and has more than twice the impact strength of conventional HIPS. The novel blends of HIPS and aHIPS reported here exhibit synergism, the impact strength of the blend being higher than expected as a linear average of the component properties. The rubber phase volume including occlusion was held at 23%. An interior optimum in rubber efficiency (i.e. Izod impact per unit weight of rubber) was observed when 75% of the phase volume was derived from HIPS while an interior minimum was observed when 25% of the phase volume was derived from HIPS. The elongation at break and tensile impact strength exhibited a form of negative synergism, indicating that conventional HIPS is superior in low speed tests and aHIPS is better in high speed tests such as Izod.     

超韧PA6/ABS合金的制备

以苯乙烯-马来酸酐（SMA）共聚物为增容剂，考察了ABS及SMA的含量对PA6／ABS共混体系的力学性能的影响；并利用SEM研究了PA6／ABS冲击断面的相结构。研究表明：SMA是PA6／ABS共混体系的有效增容剂。随着其含量的增加，分散相ABS粒子的尺寸减小，分散更加均匀，能显著地改善PA6／ABS共混物的冲击、拉伸和弯曲性能。在该共混体系中，ABS含量的增加能够大幅度地提高PA6／ABS共混物的冲击韧性；但当ABS含量超过10％时，将使PA6／ABS共混物的拉伸和弯曲性能明显下降。SMA的添加量为0．5％，且质量比为90／10的PA6／ABS共混体系能保持较好的加工性能，制备的PA6／ABS合金具有最佳的综合力学性能和超高韧性．Izod缺口冲击强度高达1200J／m。     

Compatibilization of high‐impact polystyrene/high‐density polyethylene blends by styrene/ethylene–butylene/styrene block copolymer

Compatibilization of polymer blends of high‐impact polystyrene (HIPS) and high‐density polyethylene (HDPE) blend by styrene/ethylene–butylene/styrene (SEBS) was elucidated. Polymer blends containing many ratios of HIPS and HDPE with various concentrations of SEBS were prepared. The Izod impact strength and elongation at break of the blends increased with increases in SEBS content. They increased markedly when the HDPE content was higher than 50 wt %. Tensile strength of blends increased when the SEBS concentration was not higher than 5 pphr. Whenever the SEBS loading was higher than 5 pphr, the tensile strength decreased and a greater decrease was found in blends in which the HDPE concentration was more than 50 wt %. The log additivity rule model was applied to these blends, which showed that the blends containing the HIPS‐rich phase gave higher compatibility at the higher shear rates. Surprisingly, the blends containing the HDPE‐rich phase yielded greater compatibility at the lower shear rates. Morphology observations of the blends indicated better compatibility of the blends with increasing SEBS concentration. The relaxation time (T₂) values from the pulsed NMR measurements revealed that both polymer blends became more compatible when the SEBS concentration was increased. When integrating all the investigations of compatibility compared with the mechanical properties, it is possible to conclude that SEBS promotes a certain level of compatibilization for several ratios of HIPS/HDPE blends. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 742–755, 2004     

环保型阻燃低烟高抗冲聚苯乙烯合金

研究了PPO、SBS、EPDM对HIPS的增韧效果,结果表明HIPS/PPO/SBS/EPDM的组成比例为60/30/5/5时,能使HIPS合金悬臂梁缺口冲击强度达到32.8kJ/m^2。通过添加磷系复合阴燃剂,HIPS合金阴燃性能达到FV-0级,烟密度等级67.35,悬臂梁缺口冲击强度10.1kJ/m^2,实现了无卤阴燃;添加对环境友好的溴系复合险燃剂,HIPS合金氧指数可高达32%,具有良好的综合性能。     

Impact strength and melt viscosity of bisphenol-a polycarbonate and styrene-maleic-anhydride copolymer blends

Mixtures of 90, 80, and 70 percent by weight bisphenol-A-polycarbonate (PC) and 10, 20, and 30 percent by weight styrene maleic anhydride (SMA) copolymer were melt-blended in a single screw extruder. Differential scanning calorimetry (DCS) and scanning electron microscopy (SEM) were used to determine the miscibility of the blends. The viscosity, as a function of shear rate and temperature, was measured by an Instron capillary viscometer. The notched impact strength as a function of temperature was measured by an Izod impact tester. The results of DSC showed two glass transition temperatures which merged slightly towards each other, indicating marginal miscibility of these blends. There was a decrease in viscosity as the fraction of SMA copolymer was increased. The most significant decrease occurred with the initial addition of SMA copolymer. The viscosity also decreased with increases in temperature. The impact strength of the blends was also dependent on SMA copolymer content. The blends showed six to ten times lower impact strengths at room temperature than the 100 percent polycarbonate. SEM analysis helped to determine the reason why the impact strength was lower for the blends. High magnification showed the presence of SMA copolymer inclusions dispersed throughout the PC matrix. These inclusions, which increased in size as SMA copolymer content was increased, acted as defects in the system.     

Compatibilization of polyethylene/poly(propylene)/polystyrene blends

The compatibilization of mixtures of polyolefins or of polyolefins with polystyrene using either liquid polybutadiene (l-PB)/organic peroxide or styrene-butadiene-styrene (SBS) block copolymers was investigated. Tensile impact strength was chosen as a measure of compatibility. Binary blends LDPE/high-impact polystyrene (HIPS) and LDPE/poly(propylene) (PP) as well as LDPE/HDPE/PP/HIPS blends were prepared by blending in the chamber of a Brabender Plasticorder. Composition of the blends corresponds to real commingled plastic waste. It was found that l-PB-based compatibilizer enhanced the impact strength of LDPE/HIPS blends with LDPE contents higher than 60 wt.-% only. Also SBS copolymer enhanced the impact strength of LDPE/PP blends with LDPE contents higher than 40 wt.-%. Both the compatibilizers substantially increased the toughness of LDPE/HDPE/PP/HIPS blends with composition similar to the municipal plastic waste.     

Compatibilization of poly(lactic acid)/high impact polystyrene interface using copolymer poly(stylene‐ran‐methyl acrylate)

In this work, a surfactant‐free emulsion polymerization method was utilized to synthesize poly(styrene‐ran‐methyl acrylate) (PSMA) at a styrene/(methyl acrylate) mole ratio of 75/25 with the aim to compatibilize high impact polystyrene (HIPS)/poly(lactic acid) (PLA) interface. HIPS/PLA blends with different PSMA contents were prepared. Their phase morphologies, mechanical properties, and rheological and crystallization behaviors were investigated using scanning electron microscopy, tensile tests, rotational rheometry, and differential scanning calorimetry. The rheological results showed that the complex viscosity, storage moduli, and loss moduli of PLA/HIPS blends were enhanced with increasing PSMA content. A decrease in the degree of crystallinity of PLA in PLA/HIPS blends with the addition of PSMA was observed in the differential scanning calorimetry results. It was also revealed that the addition of a small amount of PSMA can effectively improve the compatibility and thus the interfacial adhesion of the PLA/HIPS blends, thereby reducing the size of the HIPS dispersion phase. When 1 wt % of PSMA was used, compared with the PLA/HIPS blends without PSMA, the tensile strength and notched Charpy impact strength of PLA/HIPS blends were improved by 95.3% and 104.8%, respectively. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 45799.     

HIPS回收料的增韧改性研究

高抗冲聚苯乙烯(HIPS)是由弹性体改性聚苯乙烯制成的热塑性材料,HIPS是最便宜的工程塑料之一.而对于HIPS回收料来说,其性能相对于新料降低了很多,特别是冲击强度.本研究主要是通过添加SBS、蒙脱土、SMA对HIPS回收料进行增韧改性,同时采用多组对比的方法对HIPS回收料的性能进行比较,研制出综合性能达到甚至超越...     

PA6/POE/SWR-3A超韧共混改性的研究

采用SWR-3A（POE—g—MAH）作为增容剂，研究了POE对PA6／POE／SWR-3A共混物的力学性能、耐热性和流变性能的影响。结果表明：在12．5份增容剂SWR-3A存在的条件下，随着POE 8150用量增大，共混物的缺口冲击强度不断增大，而拉伸强度、维卡耐热温度、表观粘度降低。当POE 8150用量超过12．5份时，共混物达到超韧。在PA6／POE／SWR-3A共混体系中，SWR-3A具有增容和增韧的双重作用。     

POM／COPA二元及POM／COPA／EVA三元共混物的研究

研究了聚甲醛供聚酰胺（POM/COPA）二元及聚甲醛／共聚酰胺／乙烯-醋酸乙烯酯共聚物（POM／COPA／EVA）三元共混物，探讨了COPA、EVA用量对共混体系性能的影响。结果表明，C1DPA的加入使共混物的熔融温度（Tm）增大；当COPA含量为4％（质量分数，下同）时，00PA能够较均匀地分散于POM基体中，共混物缺口冲击强度出现最大值，比纯聚甲醛提高了约63．3％，而拉伸强度变化不大，POM／COPA共混物具有较理想的综合力学性能。EVA的加入使共混物缺口冲击强度和拉伸强度均呈下降趋势。