聚苯硫醚的增强增韧研究

将玻璃纤维和弹性体同时添加到聚苯硫醚(PPS)树脂中.通过双螺杆挤出机制备出聚苯硫醚复合材料;就玻璃纤维和弹性体对聚苯硫醚的增强增韧效果进行了研究,结果表明:玻纡对聚苯硫醚的增强效果比较明显,当玻纤质量分数达到20%时,共混体系的拉伸强度提高1倍,达到110 MPa;但玻纤对聚苯硫醚的增韧效果比较有限,当玻纤质量分数达到30%时,体系的冲击强度达到最大.弹性体EMG对聚苯硫醚具有很好的增韧作用,当其质量分数达到12%时,共混体系的缺口冲击强度达到18.2 kJ/m2;但同时体系的拉伸强度有一定程度的F降.     

聚苯硫醚/高密度聚乙烯/玻纤复合材料增韧研究

以马来酸酐接枝聚乙烯( PE-g-MAH)作为界面增容剂,将聚苯硫醚(PPS)、高密度聚乙烯(PE-HD)和玻璃纤维(GF)在转矩流变仪中混炼制得复合材料,并对其冲击性能、断面形貌及增韧机理进行了分析.结果表明,PPS基体中添加PE-HD与GF可有效提高复合材料的缺口冲击强度,且随PE-HD含量的增加显著提高.随着PE...     

聚苯硫醚复合材料的增强与增韧

介绍了聚苯硫醚(PPS)树脂的物化性能，对近年来PPS复合材料的增强、增韧以及加工性能改性等方面的研究进展进行了简要的述评。     

玻纤增强聚苯硫醚复合材料制备工艺与性能的研究

研究了玻璃纤维(GF)增强聚苯硫醚的双螺杆挤出及注塑成型工艺，探讨了螺杆剪切元件、注塑机料筒温度、试样热处理等加工工艺参数对复合材料性能的影响以及GF用量对复合材料力学性能的影响。结果表明：挤出机螺杆剪切块的数目决定了GF在基体中的尺寸和分散程度，当剪切块组数为5时复合材料具有较好的综合力学性能和制品外观；注塑温度为310℃时复合材料的综合力学性能更加优越；在实验条件下，成型后热处理反而使复合材料的力学性能略有下降；随GF用量的增加，复合材料的力学性能先升后降。     

增强增韧聚苯硫醚复合材料研制及其应用

以玻璃纤维为增强体系,加入相容剂和其他添加剂,制备了一种增强增韧聚苯硫醚(PPS)复合材料,探讨了玻璃纤维、相容剂加入对复合材料性能的影响。结果表明,当PPS、玻璃纤维、相容剂质量比为51:40:9时,制备的复合材料有较好的力学性能和耐热性能。     

玻璃纤维布增强聚苯硫醚复合材料的性能研究

研究玻璃纤维布增强聚苯硫醚复合材料及高岭土填充GF／PPS复合材料力学性能的变化。研究表明：玻璃纤维布增强复合材料的拉伸强度和冲击强度与其含量有关。用偶联剂处理过的高岭土填充GF／PPS复合材料，改善了高岭土与聚苯硫醚的相空性及分散性，从而提高了材料的冲击强度     

玻纤增强聚苯硫醚（FR—PPS）的加工及应用

本文论述了聚苯硫醚的特点及性能。介绍了玻纤增强聚苯硫醚制作方法,比较了单螺杆挤出机包复回挤玻纤增强聚苯硫醚方法和双螺杆挤出机直接玻纤增强聚苯硫醚方法的各自优缺点。讨论了玻纤增强聚苯疏醚的加工特点和应用领域。     

玻璃纤维增强聚乳酸复合材料的增韧改性研究

通过双螺杆挤出共混的方式制备了玻璃纤维增强聚乳酸复合材料,并采用乙烯/醋酸乙烯共聚物(EVA)、马来酸酐接枝乙烯辛烯共聚物(POE-g-MAH)、马来酸酐接枝高密度聚乙烯(HDPE-g-MAH)增韧剂对该复合材料进行了增韧改性,系统研究了玻璃纤维添加量、增韧剂用量对复合材料力学性能的影响,并结合扫描电镜等仪器对其增强及增韧改性的机理进行了研究。结果表明:EVA,POE-g-MAH,HDPE-g-MAH不仅改善复合材料的冲击性能,而且所制备的复合材料的拉伸强度、弯曲强度也得到了一定程度的提高;与HDPE-g-MAH相比,EVA与POE-g-MAH对复合材料表现出更佳的增强增韧效果。     

碳纤维布增强聚苯硫醚复合材料的性能研究

研究碳纤维布的含量、表面处理方法及填料等对聚苯硫醚复合材料性能的影响。结果表明，随着碳纤维布含量的增加，复合材料的拉伸强度、冲击强度提高；碳纤维布经过表面处理后与聚苯硫醚的粘接强度大大提高，其中用丙酮浸泡的效果好于高温热处理；填料硅灰石经偶联处理后加入复合材料中，可提高材料的力学性能和耐热性。     

聚苯硫醚流变行为研究

采用高压毛细管流变仪研究了进口聚苯硫醚(PPS)树脂的流变性能,分析了剪切速率、温度对PPS树脂流变行为的影响。结果表明,PPS树脂的非牛顿指数均小于1;在低剪切速率下,PPS树脂的表观黏度对温度的依赖程度高于高剪切速率下的依赖程度;PPS树脂的黏流活化能随剪切速率的增加呈减小趋势,其结构黏度指数随温度升高而减小。     

聚苯硫醚皮芯复合纤维的性能研究

以聚苯硫醚(PPS)树脂和聚对苯二甲酸乙二醇酯(PET)树脂为原料,采用复合纺丝技术,制得PPS-PET皮芯复合纤维。对纯PPS纤维和PPS-PET复合纤维分别进行了紫外线照射、热处理和耐酸碱处理,对比了两者处理后的力学性能变化,验证了复合纤维应用的可行性。试验结果表明:PPS-PET皮芯复合纤维的耐热性能略低于PPS纤维;而经过同等强度的紫外光辐照后,PPS-PET皮芯复合纤维的强度保持率是PPS纤维的2倍左右;在试验条件下经过酸、碱浸泡后,PPS-PET皮芯复合纤维的强度保持率与PPS纤维相比未表现出明显差异。性能研究结果表明:通过复合纺丝,PPS纤维的综合性能有所改善。     

聚甲基乙烯基硅氧烷增韧聚苯硫醚的力学性能研究

通过熔融共混制备了聚苯硫醚/无苯基聚甲基乙烯基硅氧烷(PPS/NPMVS)共混物及聚苯硫醚/单苯基聚甲基乙烯基硅氧烷(PPS/SPMVS)共混物,并对该共混物体系的微观形貌及力学性能进行了分析表征。结果表明,弹性体在共混物中均匀分散,弹性体的加入对PPS基体起到明显的增韧效果;当弹性体的含量为3 %（质量分数,下同）时,2种共混材料的增韧性能最佳,PPS/NPMVS共混材料的断裂伸长率相对于PPS基体提高了3.9倍,PPS/SPMVS共混材料的断裂伸长率相对于PPS基体提高了2.4倍;当NPMVS含量为10 %时,PPS/NPMVS共混材料的冲击强度相对于PPS基体提高了1.8倍,当SPMVS含量为3 %时,PPS/SPMVS共混材料的冲击强度相对于PPS基体提高了1.4倍。     

超支化聚苯硫醚与线性聚苯硫醚的对比表征

以2,4-二氯苯硫酚为原料,采用一步法合成超支化聚苯硫醚。笔者运用红外光谱、拉曼光谱、荧光光谱、示差扫描量热分析、热重分析、广角X-射线衍射、溶解实验等分析手段,对超支化聚苯硫醚和线性聚苯硫醚的基本性能进行了对比。由于两者结构上的差异,使得两者表现出不同的特性。超支化聚苯硫醚具有三取代苯结构,具有很强的荧光效应、完全的不结晶、溶于有机溶剂、热降解温度低于线性聚苯硫醚约60℃等特性。广角X-射线衍射谱图也和结晶、无定型线性聚苯硫醚有很大不同。     

Kinetics of the thermal degradation of hyperbranched poly(phenylene sulfide)

An advanced heat‐resistant hyperbranched poly(phenylene sulfide) (HPPS) had been subjected to dynamic thermogravimetric analysis (TGA) in nitrogen. The presence of a single peak in the DTG cures suggested that weight loss occurs in a single stage. The thermal decomposition kinetics had been analyzed by applying the Kissinger, Friedman and Ozawa‐Flynn methods. The E values determined for the hyperbranched PPS using these analyses were found to be 183.1, 189.2, 193.9 kJ mol^?1, respectively. Coats‐Redfern method was used to discuss the probable degradation mechanisms. The solid‐state decomposition mechanism followed by the degradation stage of HPPS was Phase boundary controlled mechanism (R₁). © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Molecular weight determination of poly(phenylene sulfide ether)

Poly(phenylene sulfide ether) and poly(phenylene sulfoxide ether sulfide ether) (PPSOESE) were successfully prepared and their structures were proved by several analytical techniques in the present work. The molecular weight (MW) of PPSOESE, a soluble polymer in common organic solvent at room temperature, was determined by gel permeation chromatography. Based on the conversion reaction of the two polymers, the MW of PPSE was calculated and correlated with its intrinsic viscosity. As a result, the Mark‐Houwink equation for PPSE was concluded. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

玻纤增强PPESK复合材料及其性能研究

以溶液共混-共沉淀的方式制备了玻纤增强含二氮杂萘联苯结构的聚醚砜酮(PPESK)复合材料；考察了两种长度的玻纤对GF／PPESK复合材料力学性能的影响，并以较长的玻纤为例，通过SEM对复合材料的形态进行观察，用DSC和TGA对其热性能进行分析，同时分析偶联剂在复合材料中的作用。结果表明：较长的玻纤更有利于提高复合材料的力学性能；当GF含量为20％时，两种GF／PPESK复合材料的力学性能都达到最大。偶联剂的加入对于改善玻纤与PPESK的界面粘结、提高玻纤对PPESK的增强效果具有重要作用。随着玻纤含量的增加，复合材料的玻璃化转变温度和热降解温度都不同程度地提高。     

Study on Polymerization Conditions and Structure of Poly(phenylene Sulfide Sulfone)

High molecular weight linear poly(phenylene sulfide sulfone)s (PPSS) were prepared by aromatic nucleophilic substitution reaction at atmospheric pressure. Influences of various polymerization conditions, such as solvent, catalyst, molar ratio, reaction temperature and time, on the molecular weight of PPSS were examined. The intrinsic viscosity of PPSS obtained under optimum synthesis conditions according to orthogonal experiments was 0.55 dl/g. The results of FT-IR, ¹H-NMR, UV spectrum and Raman spectrum confirmed the linear chain nature of product. The maximum UV absorption of PPSS increased with the increase of its intrinsic viscosity. X-ray diffraction and SALS studies indicated that some local ordered structures formed in the samples annealed between 220 ^○C∼240 ^○C for 4 h. The improvement in thermal performance of PPSS of high molecular weight was confirmed by DSC and TGA experiments.     

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     

Studies on the thermal properties of poly(phenylene sulfide amide)

Thermal properties of poly(phenylene sulfide amide) (PPSA) prepared using sodium sulfide, sulfur, and thiourea as sulfur sources which reacted with dichlorobenzamide (DCBA) and alkali in polar organic solvent at the atmospheric pressure, were studied. The glass transition temperature (T_g), melting point temperature (T_m), and melting enthalpy (ΔH_m) of the related polymers were obtained by use of differential scanning calorimetry analysis. The results are: T_g = 103.4–104.5°C, T_m = 291.5–304.7°C, and ΔH_m = 104.4–115.4 J/g. Thermal properties such as thermal decomposition temperature and decomposition kinetics were investigated by thermogravimetric analysis under nitrogen. The initial and maximum rate temperatures of degradation were found to be 401.5–411.7°C and 437–477°C, respectively. The parameters of thermal decomposition kinetics of PPSAs were worked out to be: activation energy of degradation was 135 to 148 kJ/mol and the 60-s half-life temperature was 360 to 371°C. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 66: 1227–1230, 1997