PPESK／PTFE共混物摩擦行为研究

采用溶液共混法制备了不同质量比的新型含二氮杂萘酮结构聚芳醚砜酮（PPESK）与聚四氟乙烯（PTFE）共混物。利用磨损试验机对该共混体系进行摩擦性能研究测试。结果表明，在干摩擦条件下，PPESK中共混加入PTFE可以明显降低其磨损量，当PTFE质量分数为20％时，摩擦系数达到最小。同时采用扫描电镜、扫描探针显微镜对共混物摩擦表面及摩擦副表面进行观察，分析了该共混体系的磨损机理。研究表明，负荷、共混组分等因素对摩擦形貌均有较大影响，在不同摩擦条件下摩擦机理不同。黏着磨损和犁耕磨损随着负荷的增加由明显转变为不明显；随着共混物中PTFE含量增加，由犁耕磨损和黏着磨损变为以黏着磨损为主。     

羟基化PPESK复合膜的制备及性能研究

采用NaBH₄对杂萘联苯聚芳醚砜酮(PPESK)支撑膜进行羟基化亲水改性，通过间苯二胺和均苯三甲酰氯的界面聚合反应制备复合膜。利用傅里叶变换红外光谱仪(FT-IR)、水接触角仪、扫描电子显微镜(SEM)和X射线光电子能谱仪(XPS)研究羟基化改性对膜表面的形貌结构、原子组成的影响，并测定复合膜对2 000 mg·L^-1 Na₂SO₄水溶液的分离性能。结果表明：羟基化改性的PPESK-OH支撑膜的亲水性增强；PPESK-OH复合膜的聚酰胺层的交联度较高；PPESK-OH复合膜和PPESK复合膜的脱盐率接近，PPESK-OH复合膜的水通量较PPESK复合膜增大了约38%。     

注塑级PPES/PPS共混合金热性能及结晶性能的研究

通过熔融挤出、注塑成型的方法制备了配比不同的含二氮杂萘酮结构的聚芳醚砜(PPES)和聚苯硫醚(PPS）的共混物，对材料的热性能及结晶性能进行了研究。热失重研究表明，在所组成范围内PPS的加入并未降低共混物的热性能，但使共混物的热变形温度有所降低；PPES的加入使PPS的结晶受到阻碍，当PPES质量分数达80％时，PPS产生了晶格缺陷，从而不能形成完善的球晶，退火过程有利于提高共混物的热变形温度，使PPS形成更完善的球晶。     

PPESK/ABS共混物流变性能的研究

以溶液共沉淀的方法制备了含二氮杂萘联苯结构的聚醚砜酮(PPESK)／ABS共混物，用毛细管流变仪测定了共混物的流变性能。在实验条件下，PPESK/ABS共混物熔体属假塑性非牛顿流体，其熔体粘度随ABS含量的增加，温度的升高，剪切速率的增大而下降，ABS的加入有利于改善PPESK的加工流动性及制品外观。     

PPES/PPS共混物的性能研究

采用熔融挤出、注射成型的方法制备了含二氮杂萘酮结构聚醚砜（PPES）和聚苯硫醚(PPS)共混物,对共混物的熔融加工性能、相容性以及力学性能能进行了研究。结果表明,共混物的熔体流动速率随着PPS含量的增加而增加,且当PPS含量较少时,共混物的熔体流动速率即有大幅度的上升;该共混物为热力学不相容体系;随着PPS含量的增加,共混物的力学性能先降低后上升,且当PPS含量约为30 %（质量分数,下同）时,共混物的力学性能最低。     

含二氮杂萘酮结构聚芳醚酮和聚芳醚砜研究进展

综述了含二氮杂萘酮结构的聚芳醚酮和聚芳醚砜的结构性能及其合成、改性、应用研究进展。     

PPESK／PS共混物流变性能的研究

以溶液共沉淀的方法制备了含二氮杂萘联本结构的聚芳醚砜酮（PPESK）。聚苯乙烯（PS）共混物，用毛细管流变仪测定了共混物的流为性能。结果表明，在本实验条件下，PPESK／PS共混物熔体属假塑性非牛顿汉体，其熔体粘度随PS含量的增加、温度的升高、剪切速率的增大而下降。PS的加入有利于改善PPESK的熔融加工流动性。     

PBAT／PVB共混物相容性及性能的研究

本研究以价格低廉的聚乙烯醇缩丁醛（PVB）边角回收料作为生物可降解材料——聚己二酸／对苯二甲酸丁二酯（PBAT）的改性材料,并对材料的结构和性能进行了研究。力学性能测试表明：以离聚体作为相容剂,在相容剂含量为1份,PVB用量为60phr时,改性材料也依然可以保持比较好的性能。DSC表明：低含量PVB使得PBAT的结晶温度向高温方向偏移,结晶度也随之降低。SEM表明：相容剂的加入大大地改善了两者之间的相容性。不同相容剂的强弱顺序依次为：离聚物〉EMH4210〉EMH3210〉POE-g-MAH。     

PPESK／PPS共混物流变性能的研究

以溶液共混－共沉淀的方式制备了含二氮杂萘联苯结构的聚醚砜酮／聚苯硫醚共混物,用毛细管流变仪考究了共混物的流变行为,讨论了剪切速率,温度和组成对体系流变性能的影响。结果表明,共混体系属于假塑性流体,少量聚苯硫醚的加入,可以明显降低体系的表观粘度,提高ＰＰＥＳＫ的加工性能。     

PPESK/TK/石墨复合材料的摩擦磨损性能研究

以含二氮杂萘联苯型聚醚砜酮(PPESK)树脂为基体,以石墨和钛酸钾晶须(TK)为填料,采用物理混合、热压模塑的方法制备了PPESK/TK/石墨复合材料。研究了石墨和TK含量对复合材料摩擦磨损性能的影响,利用扫描电镜观察了磨面的形貌。结果表明,石墨和TK均能显著改善聚合物材料的摩擦磨损性能,并具有明显的协同作用。石墨对降低材料的摩擦系数起主导作用,仅以石墨为填料,材料的摩擦系数可降低至纯树脂的1/3;而TK对复合材料的磨损性能起到了明显的改善作用,当TK和石墨比例为3∶1时,材料的磨损率可降至最低,比纯树脂降低了两个数量级。扫描电镜观察结果表明材料的磨损机理主要为磨粒磨损、粘着磨损和轻微的疲劳磨损。     

Miscibility Studies of PVC / ELNR Blends

Summary Liquid natural rubber of two different molecular masses, viz., and 9500, each with epoxidation of 20 and 50 mol % (L-ELNR-20, L-ELNR-50, and H-ELNR-20, H-ELNR-50) were prepared and blended with polyvinyl chloride (PVC). Miscibility of these blend systems was studied with special reference to blend ratio, mol % of epoxidation and effect of molecular mass of the liquid rubber by various techniques such as stress – strain measurement, SEM studies and DSC analysis. It was observed that PVC/L-ELNR-50 and PVC/H-ELNR-50 systems were homogenous and miscible compared to PVC/L-ELNR-20 and PVC/H-ELNR-20 blends and the maximum modification in properties was found for the former systems. Results of blends with 20 mol % epoxidised liquid rubber showed that the components are only partially miscible and hence they are heterogeneous systems. Miscibility achieved with an increase in mol per cent epoxidation of the liquid rubber is explained on the basis of the higher polar interaction between the blend components. Analysis of the blends also revealed that the lower molecular mass epoxidised rubber is aiding better property modifications than the higher molecular mass rubber. This is explained by the fact that rubber with lower chain length provides greater penetration into the PVC interstices enabling better solubilisation of the PVC segments.     

Phase Morphology and Miscibility of iPP/PcBR Blends

Isotactic polypropylene/poly(cis-butadiene) rubber (iPP/PcBR) blends were prepared by melt mixing. Phase morphology of the blends was investigated by scanning electronic microscopy (SEM). It was found that the dispersed phase spread in continuous phase in a form of spherical particles. The size of the dispersed phase increased as its content increased. The phase-inversion region was the composition of 50/50 and 40/60 vol% in the blends. In the phase-inversion region, a double continuous phase was formed. The glass transition temperatures (T _g ) of iPP, PcBR and blends were analyzed by dynamic mechanical analysis (DMA). The blend compositions exhibited two distinct glass transition temperatures corresponding to the iPP-rich and PcBR-rich phases, respectively. The approach of these two peaks with increasing PcBR content indicated partial miscibility between the iPP and PcBR, which was verified by the equilibrium melting point depression of blends.     

Miscibility,Mechanical and Thermal Properties of Melt-Mixed Poly(trimethylene terephthalate)/Polypropylene Blends

This study examined the miscibility, mechanical and thermal properties of melt-mixed blends of PTT(poly(trimethylene terephthalate)) with PP(isotatic polypropylene). DMA and SEM results indicated that the PTT/PP blends are immiscible. Revealed from TGA analyses, the blends with a higher PP content showed a higher degradation temperature. A complex melting behavior was observed for the blends. The isothermal crystallization kinetics of the blends was analyzed from 200°C to 210°C using the Avrami equation. The WAXD results showed that the crystal structure of PTT remained unchanged in the blends. Nevertheless, the PP rich blends possessed lower tensile strength and higher elongation at break.     

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.     

Miscibility and Crystallization Behaviors of Polyamide 6/Polytetrafluoroethylene Blends

Summary: The miscibility and crystallization behaviors of polyamide 6 (PA 6)/polytetrafluoroethylene (PTFE) blends, prepared via reactive extrusion, are systematically investigated by means of wide‐angle X‐ray diffraction (WAXD), differential scanning calorimetry (DSC), and dynamic mechanical thermal analysis (DMTA). WAXD measurements show that no co‐crystallization occurred between two components, while DSC and DMTA measurements suggest that a certain degree of miscibility between them might exist due to the formation of some copolymers during the reactive extrusion.

DMTA curves for the pure PA 6 sample and PA 6/PTFE blends with various compositions.     

mLLDPE流变与加工特性的研究

主要研究国产mLLDPE加工特性,通过流变试验确定mLLDPE的临界剪切速率范围,并在mLLDPE中加入加工助剂,消除mLLDPE的熔体破裂现象,利用mLLDPE与LDPE共混,增强mLLDPE熔体强度,提高膜泡稳定性。