线性高分子聚苯硫醚的合成及溶助剂循环利用的研究

采用均匀设计法研究合成线性高分子聚苯硫醚(PPS)树脂。研究了反应温度、反应时间、原料配比、溶剂用量以及助剂用量等因素对产品得率的影响。实验数据经过多元逐步回归分析,找出其最佳工艺条件:前期反应温度为210.9℃,反应时间为2.8 h;后期反应温度为270℃,反应时间为2.5 h,n(Na2S.9H2O)∶n(对二氯苯)=1.1∶1,V(N-甲基吡咯烷酮)∶n(对二氯苯)=550 mL∶1 mol,m(助剂)∶n(对二氯苯)=20 g∶1 mol。按照此反应条件下反应得到线性高分子聚苯硫醚树脂,其重均相对分子质量接近60 000,平均收率在93.7%以上。不需繁琐的回收工艺,即同时实现了助剂和溶剂的可循环利用,多次循环利用后产品的收率仍高于91.2%。并用热分析、红外分析、元素分析对产品进行了表征。     

A/O-MBR处理聚苯硫醚生产废水试验研究

采用A/O一体式膜生物反应器处理高含量、难降解的聚苯硫醚(PPS)生产废水。结果表明,处理PPS废水原水时,系统COD去除率受到一定程度的影响,平均去除率为91%,氨氮去除率较差;而处理PPS废水处理站厌氧出水时较稳定,出水COD小于69mg/L,平均为27mg/L,平均去除率为97%;出水TN受m(COD)/m(TN)的影响,去除率在38%～55%内;出水pH在7.59～7.92,SS的质量浓度<5 mg/L,色度为16倍。系统处理的PPS厌氧出水可达到PPS生产回用水要求,膜组合清洗能够有效的恢复膜通量。研究结果可为PPS生产废水有效处理并回用提供了新思路。     

芳纶纳米纤维毡/聚苯硫醚高温超过滤材料的制备及其性能

以N,N-二甲基乙酰胺/氯化锂(DMAc/LiCl)为溶剂溶解间位芳纶纤维,采用高压静电纺丝技术制备直径为100～500 nm的芳纶纳米纤维毡,与聚苯硫醚(PPS)针刺非织造布复合后形成高温超过滤材料。结果表明,芳纶纳米纤维毡具有良好的强度和耐高温性能,复合纤维毡对粒径位于0.1～0.6μm之间超微粒子的过滤效率达到99.9%,明显高于普通PPS非织造布的过滤效率(70%),但纳米芳纶/PPS复合高温超过滤非织造布的压降随芳纶纳米纤维膜厚度的增加而迅速下降,这是因为芳纶纳米纤维膜中纤维尺寸和孔径较小,导致过滤时阻力明显增加。     

Study on Morphology and Non-isothermal Crystallization Behavior of Poly（phenylene sulfide）/Poly（ethylene-co-cyclohexane 1,4-dimethanol terephthalate） Blend

A binary alloy consisting of poly(phenylene-sulfide) (PPS)/ poly(ethylene terephthalate-co-1,4-cyclohexanedimethanol) (PETG) was prepared by the melt blending technology using a twin-screw extruder. The morphology and crystallization behavior of the alloy material were investigated by means of SEM, POM and DSC. The SEM study of the alloy samples revealed that PPS and PETG comprised an incompatible system and the interface structure of two phases could be observed distinctly when the composition of the binary alloy was being changed. The POM results had revealed that incorporation of PETG into PPS could lead to formation of larger spherulite crystals in the course of PPS crystallization, but small and grainy spherulite crystals appeared with further increase in the PETG concentration. The DSC analyses revealed that addition of PETG to the alloy composition could shift the PPS crystallization temperature towards the high-temperature region.     

PPS/PETG合金非等温结晶动力学研究

采用双螺杆熔融共混工艺制备得到了聚苯硫醚（PPS）/聚对苯二甲酸乙二醇-1,4-环己二甲醇酯（PETG）二元合金PPS/PETG,采用不同降温速率的DSC实验对PPS/PETG合金的非等温结晶动力学进行了研究。结果表明,加入PETG后可使PPS的结晶温度向高温方向移动。采用Avrami及莫志深方法对PPS/PETG合金的非等温结晶动力学参数进行了计算。结果表明PPS/PETG合金可以产生较为明显的二次结晶现象,Avrami指数偏低,其中莫志深方法比较适用PPS/PETG合金的非等温结晶动力学过程。     

Effects of nucleating agents on the porous structure of polyphenylene sulfide via thermally induced phase separation

The different molecular weight Polyethylene glycol (PEG) was chosen to be the nucleating agent to investigate the effects of nucleating agents on the porous structure of polyphenylene sulfide (PPS) via thermally induced phase separation (TIPS). The pore structures were changed with the addition of PEG, due to the different mechanism on pattern formation. Moreover, some effecting factors, such as the molecular weight and concentration of PEG, were used to control the pore structure and size. With addition of nucleating agent, it can be estimated that the pore size (radius) should be about 0.5 ～ 0.05 μm and the porosity should be above 70%. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

PPS基纳米复合介质制备与性能研究

采用化学沉淀法制备了平均粒径约30 nm的TiO2粉料,以聚苯硫醚树脂为基复合纳米无机粉料,结合螺杆挤出与模压等工艺制备了复合介质基板,借助SEM、EDS、DTA-TGA分别对合成的纳米粉料及树脂基复合料进行了微观结构表征与分析,用带状线方法对PPS基无机复合介质基板微波复介电常数进行了测量。获得了相对介电常数为6.0～13.0,且损耗低的高性能新型微波复合介质材料。     

三维电极法对聚苯硫醚合成废水的预处理试验研究

以石墨电极为阴极,RuO2-IrO2-SnO2/Ti电极为阳极,处理后的柱状活性炭组成三维电极体系对实际PPS合成废水进行预处理,并与二维电极法进行处理效果比较。分析废水在不同浓度下的处理效果,研究废水在电解过程中主要有机物的降解变化情况。结果表明:三维电极对废水CODCr去除效果上明显优于二维电极,CODCr最大去除率达46.5%;氨氮和色度去除率分别达到了62.9%和52%;废水B/C由0.15提高到0.44,可生化性显著提高;废水CODCr的去除过程符合二级动力学方程;通过GC-MS分析,表明废水中存在苯环类化合物及具有碳链结构的无机物,电解反应后废水中氯苯、二氯苯类物质得以彻底去除。     

磺化热压PPS非织毡的性能研究

利用磺化反应及热压处理改善聚苯硫醚(PPS)非织毡的亲水性和离子交换能力,讨论了时间、温度、热压压力等不同反应条件对PPS亲水性及离子交换能力的影响.实验结果表明,在磺化反应温度为80℃,反应时间为1.5h的磺化反应条件及热压压力为9 MPa条件下,不仅PPS非织毡的亲水性和离子交换能力得到了显著的改善,同时还保留了较好的力学性能和耐腐蚀性.     

Microcellular foaming of poly(phenylene sulfide)/poly(ether sulfones) blends using supercritical carbon dioxide

Microcellular foaming of poly(phenylene sulfide)/poly(ether sulfones) (PPS/PES) blends presents a promising approach to produce high‐performance cellular materials with tailored microstructures and enhanced properties. This study investigated the effects of multiphase blend composition and process conditions on the foaming behaviors and final cellular morphology, as well as the dynamic mechanical properties of the solid and microcellular foamed PPS/PES blends. The microcellular materials were prepared via a batch‐foam processing, using the environment‐friendly supercritical CO₂ (scCO₂) as a blowing agent. The saturation and desorption behaviors of CO₂ in PPS/PES blends for various blend ratios (10 : 0, 8 : 2, 6 : 4, 5 : 5, 4 : 6, 2 : 8, and 0 : 10) were also elaborately discussed. The experimental results indicated that the foaming behaviors of PPS/PES blends are closely related to the blend morphology, crystallinity, and the mass‐transfer rate of the CO₂ in each polymer phase. The mechanisms for the foaming behaviors of PPS/PES blends have been illustrated by establishing theoretical models. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42634.