PPEK/PPS共混物流变性能的研究

通过熔融挤出的方法制备了含不同比例的二氮杂萘酮结构的聚芳醚酮（PPEK）和聚苯硫醚（PPS）共混物，并用毛这流变仪研究了该共混物的流变性能。在所研究的温度和剪切速率范围内，当PPS窗户低时，PPEK／PPS共混物溶体为典型的假塑性流体，而当PPS含量为60％时，共混物则近似为牛顿流体。PPS的混入极大地降低了PPEK的熔体粘度，而且在一定范围内，随PPS含量的增加，可有效地改善挤出物外观。同时考察了剪切速率，实验温度等对共混物流变性能的影响。     

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。     

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。     

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。     

茂金属聚乙烯（mPE）／高压聚乙烯（LDPE）共混熔体的流变学

研究了不同比例共混的茂金属聚乙烯（mPE)和高压聚乙烯（LDPE）熔体的流变行为,讨论了共混物组成、剪切速率和剪切应力以及温度对熔体流变曲线、熔体粘度和膨胀比的影响,mPE的加工提供了理论依据。不同共混比的熔体均为假塑性流体,且熔体假塑性随LDPE含量增大而增强。熔体流动活化能随LDPE组成的增加逐渐增大,粘度对温度的敏感性增强,共混物的非牛顿指数随LDPE的增加而降低,改善了mPE的加工性能。     

PP/PET共混熔体的流变性能研究

以PP-g-AA作增容剂,研究了PP/PET共混熔体的流变行为。讨论了温度、剪切速率以及PET和增容剂含量对熔体表观粘度、非牛顿指数等方面的影响。结果表明,PP/PET共混物熔体表观粘度随剪切速率的增大而降低,随PET及增容剂含量的增加而下降,随温度的升高而下降。PET和增容剂的加入,在共混熔体中起到了增塑剂的作用。     

聚甲醛/聚氧化乙烯共混体系流变行为的研究

将聚甲醛(POM)与聚氧化乙烯(PEO)熔融共混,制备改性聚甲醛,用熔体指数仪和高压毛细管流变仪研究了POM、PEO及POM/PEO共混体系的流变性能.试验结果表明随PEO含量增加,共混体系熔体指数(MFI)减小.POM表观黏度对温度的敏感性大于PEO,对剪切速率的敏感性小于PEO.随PEO含量增加,共混体系的温度敏感性下降,剪切敏感性增大.在热塑加工中,可通过改变剪切速率,调节熔体黏度,从而控制共混物形态结构.     

聚砜／聚苯硫醚共混物的动态黏弹行为及力学性能研究

研究了聚砜/聚苯硫醚（PSF／PPS）共混物的动态流变特征、共混物动态热力学行为及力学性能，并分析了相容性与力学性能的关系。结果表明，PPS的加入显著改善了共混物的流动性，共混物的黏度随PPS含量和温度的上升而下降，对剪切速率的变化不敏感；共混体系呈一定界面相互作用的两相体系，其相容性依赖于组成比例。当PSF/PPS为3／7（质量比，下同）时共混体系相容性最好，相应地表现出最好的综合力学性能，尤其是冲击强度比PPS提高了64％。     

PC/UHMWPE共混物的流变性能

采用熔融共混的方法 ,制备了两种不同配比的PC/UHMWPE共混物。采用毛细管流变仪和熔融指数仪研究了PC/UHMWPE共混物的流变行为 ,结果表明 :PC/UHMWPE共混物熔体的流变行为呈假塑性流体的特征 ,表观粘度随剪切速率的增加而减小 ,随温度的升高而降低 ;共混物熔体的粘度大于纯PC的粘度。采用悬浮体系模型讨论了两种共混物的流变行为     

聚苯硫醚的流变性能研究

采用毛细管流变仪研究了纤维级聚苯硫醚(PPS)的流变性能。结果表明,PPS在剪切速率为150～400s~(-1)时,会出现剪切增稠现象;剪切速率在400～1000 s~(-1)时,PPS熔体为假塑性流体,PPS的非牛顿指数随温度的升高而逐渐趋近于1,PPS熔体的表观粘度与温度之间的关系符合Arrhenius方程,PPS熔体的粘流活化能随剪切速率的增大而减小,减小的速度随剪切速率的增大而变慢。     

Effect of blending on the multiple melting behavior of polyphenylene sulfide

The effects of melting time (t_melt) and annealing time (t_a) at a temperature closer to the melting point of polyphenylene sulfide (PPS) on the multiple melting behavior of neat PPS, and PPS component in their blends have been investigated by differential scanning calorimetry (DSC). It is found that double endotherm peak of PPS annealed at 275°C for less than three hours is different from that annealed for twelve hours. Double endotherm peak of PPS in PEEK/PPS blends shifts to lower temperature, and the intensity of the upper melting peak decreases significantly by addition of polyether ether ketone (PEEK). An additional third melting peak could be observed. The temperature of third melting peak is above 310°C and increases as the t_a and PEEK content are increased. For PEK-C/PPS blends, the lower and upper melting temperatures of the PPS component are higher than that of neat PPS annealed at 275°C for twenty-three hours. © 1996 John Wiley & Sons, Inc. J Appl Polym Sci 63: 1001–1008, 1997     

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。     

Investigation on the crystallization behavior of poly(ether ether ketone)/poly(phenylene sulfide) blends

The morphology of nonisothermally crystallized poly(phenylene sulfide) (PPS) and its blend with poly (ether ether ketone) (PEEK) have been observed by polarized optical microscope (POM) equipped with a hot stage. The nonisothermal crystallization behavior of PPS and PEEK/PPS blend has also been investigated by differential scanning calorimetry (DSC). The maximum crystallization temperature for PEEK/PPS blend is about 15°C higher than that of neat PPS, and the crystallization rate, characterized by half crystallization time, of the PEEK/PPS blend is also higher than that of the neat PPS. These results indicate that the PEEK acts as an effective nucleation agent and greatly accelerates the crystallization rate of PPS. The Ozawa model was used to analyze the nonisothermal crystallization kinetics of PPS and its blends. The Avrami exponent values of neat PPS are higher than that of its blend, which shows that the presence of PEEK changed the nucleation type of PPS from homogeneous nucleation to heterogeneous nucleation. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

PPS／PEEK熔融共混物DSC多次扫描研究

借助ＤＳＣ研究ＰＰＳ／ＰＥＥＫ共混物熔融时间，ＰＥＥＫ粒径及ＰＰＳ组分对共混物中ＰＥＥＫ结晶熔融行为的影响，结果表明，ＰＥＥＫ粒径由５００～１０００μｍ减小至２００～５００μｍ时，ＰＥＥＫ与ＰＰＳ相互作用增大，ＰＥＥＫ的结晶峰由单峰分裂为双峰，其高温结晶峰向高温移动，峰强随熔融时间延长而减弱，低温结晶峰向低温移动，峰强随熔融时间延长而增大，熔融时间延长时，退火后ＰＥＥＫ的低温熔融峰强增大，而高温熔     

Effect of high-performance polymers on crystallization and multiple melting behavior of poly(phenylene sulfide)

The crystallization and multiple melting behavior of poly(phenylene sulfide) (PPS) and its blends with amorphous thermoplastic bisphenol A polysulfone (PSF) and phenolphthalein poly(ether ketone) (PEK-C), crystalline thermoplastic poly(ether ether ketone) (PEEK), and thermosetting bismaleimide (BMI) resin were investigated by a differential scanning calorimeter (DSC). The addition of PSF and PEK-C was found to have no influence on the crystallization temperature (T_c) and heat of crystallization (ΔH_c) of PPS. A significant increase in the value of T_c and the intensity of the T_c peak of PPS was observed and the crystallization of PPS can be accelerated in the presence of the PEEK component. An increase in the T_c of PPS can also be accelerated in the BMI/PPS blend, but was no more significant than that in the PEEK/PPS blend. The T_c of PPS in the PEEK/PPS blends is dependent on the maximum temperature of the heating scans and can be divided into three temperature regions. The addition of a second component has no influence on the formation of a multiple melting peak. The double melting peaks can also be observed when PPS and its blends are crystallized dynamically from the molten state. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 637–644, 1998     

耐热树脂共混物的界面增容研究

研究了ＰＭＲ型聚酰亚胺（ＰＩ）增容聚芳醚酮（ＰＥＫ－Ｃ）／聚苯硫醚（ＰＰＳ）共混物的热学性能、力学性能及其形态结构,对ＰＭＲ型ＰＩ在ＰＥＫ－Ｃ／ＰＰＳ共混物中所起的增容作用机理进行了初步的探讨,实验发现,热固性聚合物预聚物可用于增容热塑性聚合物共混体系,这种增容方法有其特殊性和新颖性,增容后的ＰＥＫ－Ｃ／ＰＰＳ共混物的力学性能得以改善。     

熔融共混PPS／PEEK中PPS组分的结晶行为

采用熔融共混法制备结晶／结晶共混体系ＰＰＳ／ＰＥＥＫ，并用差示扫描量热法研究了不同ＰＥＥＫ含量和不同ＰＥＥＫ粒径对ＰＰＳ／ＰＥＥＫ共混物中ＰＰＳ组分结晶行为的影响。随ＰＥＥＫ含量的增加ＰＰＳ的结晶温度提高，结晶峰宽增加。这是由于在降温过程中ＰＥＥＫ先结晶，可充当ＰＰＳ熔体结晶的异相晶核，使ＰＰＳ结晶温度提高，且随着ＰＥＥＫ含量增加，异相晶核密度增大，但ＰＥＥＫ晶区的存在阻碍了ＰＰＳ的结晶生长过程，