ABS／PMMA合金性能的研究

制备了不同配比的ABS/PMMA合金,分别研究了PMMA含量、粘度对合金的缺口冲击强度、拉伸强度、热变形温度、熔体流动速率等性能的影响。结果表明：ABS中引入PMMA可以提高耐热性能;ABS与PMMA共混能提高PMMA的力学性能特别是缺口冲击强度,当ABS/PMMA中PMMA为20%时,共混物具有最优的力学性能;一般情况下,ABS/PMMA合金的流动性介于ABS和PMMA的流动性之间,采用高粘度PMMA的合金性能较佳。     

环状ABS/SBS试样疲劳破坏断口分析

采用(丙烯腈/丁二烯/苯乙烯)共聚物/(苯乙烯/丁二烯/苯乙烯)共聚物(ABS/SBS)材料成型了圆环状试样,使用自行设计的试验装置对环状试样进行疲劳试验,分析比较在环状下的断口形态学,测试出不同含量SBS对ABS环状试样在不同应力和频率下的裂纹扩展速度及断口形貌.从而获得了比标准试样更准确的填料特性对材料不同加工条件疲劳性能的影响情况.最后提出在不同条件下提高材料疲劳强度的方法.     

制备工艺对PVC／ABS合金聚集态结构与性能的影响

通过正交设计研究了制备工艺(转速、温度、时间)对PVC/ABS合金聚集态结构与性能的影响.结果表明:转速和温度对合金ABS分散相的粒径尺寸及分布影响最大,时间对PVC/ABS合金冲击强度影响最大,温度因素对PVC/ABS合金的拉伸强度影响最大.当转速为60 r/min,温度为190℃,时间为220 s时,制备的PVC/ABS合金具有较理想聚集态结构和优异的综合力学性能.     

CPVC／PVC与CPVC／ABS合金加工性能研究

研究了聚氯乙烯(PVC)与丙烯腈-丁二烯-苯乙烯共聚物(ABS)用量对氯化聚氯乙烯(CPVC)/PVC、CPVC/ABS合金最低塑化温度Tmin、塑化时间t、平衡扭矩TQ等加工性能以及体系的热稳定性的影响;同时对合金的耐热性能进行了分析.结果表明,随着体系中PVC、ABS用量的增加,CPVC/PVC、CPVC/ABS合金的Tmin、t和TQ降低,而体系的热稳定性增加.     

不同组成ABS对ABS／PMMA合金性能的影响

选用两种不同牌号的ABS树脂与PMMA共混，对其组成与性能的关系进行了详细的研究。试验结果表明，不同组成的ABS对ABS/PMMA混合物的光学性能、力学性能以及流变行为的影响都有显著的不同．     

ABS与PMMA的共混合金及性能研究

使用双螺杆挤出机制备不同配比的ABS/PMMA合金,考察了ABS/PMMA合金的力学性能,并通过维卡软化温度和溶体流动速率考察了ABS/PMMA合金的加工性能。结果表明:一定范围内随着ABS占比增加,ABS/PMMA合金的韧性及冲击强度增加、拉伸和弯曲强度下降、加工性能提高,ABS最优占比为20%。     

ABS树脂冲击性能表征方法研究

ABS树脂冲击性能测试标准主要采用ASTM D256和ISO 180,对应测试样条的尺寸差异较大,不同测试标准和测试条件下得到的试验结果往往没有可比性。通过对比ASTM、ISO两种标准下ABS树脂的冲击性能,研究不同注塑工艺对测试结果的影响,确定影响产品冲击性能表征的关键因素。结果表明:ASTM标准下的1/4'样条的冲击强度和ISO标准下的样条的冲击强度接近,ASTM标准下的1/8'样条的冲击强度测试值大于前两者;不同注射温度、注射速度和注射压力对ABS冲击强度测试值影响显著,并且不同牌号ABS树脂对上述工艺参数的敏感度不同。     

注塑工艺对PC/ABS合金电镀性能的影响研究

对聚碳酸酯(PC)/丙烯腈-丁二烯-苯乙烯(ABS)合金采用使用不同的注塑工艺注塑后电镀。研究了注塑工艺对PC/ABS合金粗化性能和镀层结合力的影响。结果表明:注塑工艺对PC/ABS合金的粗化性能和镀层结合力影响较大,注塑温度过低、压力和速度过高以及模具温度过低都会降低PC/ABS合金的粗化性能和镀层结合力。     

耐热抗冲PC/ABS合金的研究

通过共混挤出的方法制备不同PC含量的合金,研究了不同PC含量对PC/ABS和PC/ABS/MBS合金力学性能和热变形温度的影响,探讨了PC/ABS/SAN/MBS四元共混体系的效果,结果表明:PC含量与合金的拉伸强度和热变形温度成正比关系,当PC含量60%时冲击韧性最佳,MBS对合金有增容增韧作用,可明显提高合金的冲击性能,但会使合金的刚性和耐热能力下降,在PC/ABS/MBS的基础上,保持PC与MBS用量,使用SAN替换40%的ABS,制备的PC/ABS/SAN/MBS四元共混合金可在保持冲击强度的同时大幅提高合金的拉伸强度和热变形温度,使合金具有更优异的综合性能。     

流动改性剂PSAM／ZrP的制备及其对PC／ABS性能的影响

用熔融挤出的方法制备了聚碳酸酯(PC)/丙烯腈-丁二烯-苯乙烯共聚物(ABS)/有机修饰磷酸锆(PSAM/ZrP)复合材料,考察了PSAM/ZrP用量对PC/ABS合金力学性能和加工性能的影响.结果表明:加入PSAM/ZrP能改善PC/ABS复合材料的流动性能,且并未引起PC/ABS摩尔质量的降低,随着PSAM/ZrP用量的增加,复合材料的模量有所提高,但复合材料的冲击性能略有下降.     

ABS工程塑料管爆破压力测试研究

设计、制造了塑料管常温及高温水压爆破测试装置 ,对ABS管进行了不同温度下的水压爆破试验 ,得到了ABS管的爆破压力。数据经分析处理后 ,绘制出ABS工作压力与温度的设计曲线 ,该曲线可应用工程设计 ,也可为我国制订ABS管和管件标准提供依据。     

ABS管的性能与应用

用改性后的ABS树脂生产的ABS管具有较高的刚性，冲击性能及硬度，抗老化，耐磨，耐磨蚀，适用范围广，可采用胶接，法兰连接及螺纹连接等方式连接，与其它塑料管及金属管相比有着明显的优势。在建筑煨等领域已得到了广泛应用，用户反映其质量良好。     

ABS工程塑料管爆破压力的测试

本文设计、制造了塑料管常温及高温水压爆破测试,装运地ABS管进行了不同温度下的水压爆破试验,得到了ABS管的爆破压力,数据经分析处理后,绘制出ABS工作压力与温度的设计曲线,该曲线可应用于设计,也可以为我国制订ABS管和管件标准提供依据。     

Evaluation of the formability of plastic/Zn22Al/plastic sandwiched structures by gas blowing

For the manufacturing of electromagnetic interference (EMI) shielding enclosures for portable 3C (computer, communication, and consumer electronics) products, a superplastic Zn22Al thin sheet is inserted in between plastic plates and formed by in-mold blowing with gas pressure. In order to evaluate the formability of a plastic/Zn22Al/plastic sandwiched structure, free bulging tests are conducted in the temperature range between 135°C and 200°C in an infrared furnace. The results show that the ABS/Zn22Al/ABS sandwiched structure can be free bulged at 150°C with 0.21 MPa of gas pressure at a forming rate similar to that of the monolithic Zn22Al sheet. The PC/Zn22Al/PC sandwiched structure cannot be effectively bulged until the forming temperature is raised to 185°C. The optimized forming condition for PC/Zn22Al/ABS is either at 150°C with a gas pressure of 0.35 MPa or at 165°C and a gas pressure setting of 0.21 MPa. Also, the thickness distributions for Zn22Al and a variety of plastic/Zn22Al/plastic specimens after free bulging at various temperatures with various gas pressures are placed in comparison in this study.     

深海玻纤增强柔性管截面结构设计及强度分析

在深海石油开采中,使用传统的钢制管道作为海底管道和立管,存在耐腐蚀性差、重量大以及柔性小等不足。热塑性玻纤增强柔性管具有重量轻、强度高、柔性好以及耐腐蚀性强等优点,逐步成为海洋管道发展的趋势。针对南海500 m海深油井使用玻纤增强柔性管进行增强层截面结构设计,依据DNVGL-RP-F119规范和美国船级社相关规范,针对柔性管增强层缠绕角度及缠绕层数,依据经验建立±30°~±75°缠绕角度和20层~40层缠绕层数的组合模型。利用ABAQUS有限元软件进行30 MPa内压、60 t拉力和5 MPa外压三种载荷工况下的强度分析,得到满足上述载荷工况的最优缠绕角度为±60°;再进行90MPa爆破压力及拉伸与外压组合工况下的强度校核,最后得到能够满足技术指标要求的增强层最优缠绕角度为±60°和最少缠绕层数为36层。     

Influence of ABS type on morphology and mechanical properties of PC/ABS blends

The morphology and the mechanical properties of polycarbonate (PC) blends with different acrylonitrile–butadiene–styrene (ABS) materials were investigated. PC/ABS blends based on a mass-made ABS with 16% rubber and large (0.5–1μm) rubber particles are compared to blends based on an emulsion-made ABS with 50% rubber and small, monodisperse (0.12 μm) rubber particles over the full range of blend compositions. The blends with the bulk ABS showed excellent impact strength for most compositions, and those containing 50 and 70% PC exhibited ductile to brittle transition temperatures below that of PC. The blends with the emulsion ABS showed excellent toughness in sharp notch Izod impact tests at room temperature and in standard notch Izod impact tests at low temperatures near the T_g of the rubber. By melt blending the various ABS materials with a styrene–acrylonitrile (SAN 25) copolymer, materials with lower rubber concentrations were obtained. These materials were used in blends with PC to make comparisons at constant rubber concentration of 5, 10, and 15%. The results of this investigation show that brittle ABS materials can produce tough PC–ABS blends. It is apparent that small rubber particles toughen PC–ABS blends at lower rubber concentrations and at lower temperatures than is possible with large rubber particles. However, additional work is needed to understand the nature of toughening in these PC–ABS blends with different rubber phase morphologies. It is of particular interest to understand the exceptional ductility of some of the blends at low temperatures. © 1994 John Wiley & Sons, Inc.     

Creep modeling of ABS pipes at variable temperature

One of the characteristic behaviors of plastic (or viscoelastic) materials is the creep phenomenon, which is defined as the continuing deformation under a constant load with time. Although research on creep of plastic pipes has been widely carried out in other plastics, little work has been reported for creep in ABS (acrylonitrile‐butadiene‐styrene) pipes at high temperatures. In this paper, the generalized Kelvin series of formulae, which consists of six Kelvin elements, a power model, as well as logarithmic regressions, are applied to the experimental data measured from creep tests under constant bending stresses at different temperatures for two ABS resins. The least‐squares method was used to adjust the Kelvin model parameters, and a Levenberg‐Marquardt non‐linear least‐squares regression procedure was used to determine the creep parameters in the power model. This led to empirical formulae for creep compliance defined as the reciprocal of the creep modulus. This creep modulus can provide a means to evaluate the long‐term structural properties for different resins used in pipe production.     

确定短ABS塑料圆管爆破压力的经验公式

针对ABS工程塑料圆管的使用安全,基于有足够强度和刚度的端部结构可提高ABS圆管爆破压力的有关试验数据,推导得到确定短ABS工程塑料圆管爆破压力的经验公式,以及区分长、短圆管的临界长度计算公式。     

高密度聚乙烯管耐氯氧化试验系统设计

为了研究高密度聚乙烯（PE?HD）管的耐氯氧化性能，基于ASTM F2263标准，设计了一种封闭循环试验系统，可在流动状态下通过改变温度、压力和有效氯含量加速试样的氧化失效。结果表明，该系统可独立测试24根DN 20的PE?HD管状试样，可编程逻辑控制器（PLC）作为控制主机可以控制管路的压力、温度和流量，再加上耦合各传感器，可实现可视化的人机界面，内置的报警系统可保证试验的安全可靠。本试验系统可用于对PE?HD输水管的耐氯氧化性能进行评价。     

Analysis of ductile and brittle failures from creep rupture testing of high-density polyethylene (HDPE) pipes

A comprehensive analysis of ductile and brittle failures from creep rupture testing of a wide spectrum of HDPE pipes was conducted. The analysis indicates that the ductile failure of such pipes is primarily driven by the yield stress of the polymer (or pipe). Examination of ductile failure data at multiple temperatures indicates a systematic improvement in performance with increasing temperature. It is proposed that testing at higher (above-ambient) temperatures leads to progressive relaxation of the residual stresses in the pipe; this causes the pipe to perform better as residual stresses are known to help accelerate the fracture process. Finally, our investigation indicates no correlation, whatsoever, between brittle failures in pressurized pipes and the PENT (Pennsylvania edge-notch tensile test; ASTM F1473) failure times. Therefore, one has to be extremely cautious in interpreting the true value of the PENT test when developing polymers and pipes for high-performance pressure pipe applications.