聚苯硫醚共混合金的研究进展

本文简述了特种工程塑料聚苯硫醚（PPS）与其它多种高聚物的共混改性，分别介绍了PPS／PA、PPS／PEEK、PPS／PSF、PPS／TLCP、PPS／PF、PPS／PBT、PPS／PES、PPS／PC、PPS／PEK－C、PPS／PS以及其它PPS共混合金在国内外的研究进展及其生产应用，其中重点论述了PPS与聚四氟乙烯（PTFE）树脂的共混改性及其该共混合金的性能与用途。并展望了PPS合金的发展。     

用X射线法测定聚对次苯基硫醚的结晶度Ⅰ.

本文报导用 X-衍射的分段连续累积计数以测定PPS结晶度的方法.按此法测出PPS原粉的结晶度约为75%.在空气中360℃恒温6小时后,PPS即氧化交联成无定形固体.由于热处理条件不同,PPS原粉中仍可能保持一定的结晶度,即有“夹生”现象.     

RHEOLOGICAL BEHAVIOR OF POLYPHENYLENE SULFIDE/POLYAMIDE-66 BLENDS

Blends of polyphenylene sulfide (PPS) containing trace amounts of branching and/orcross-linking in chain and Polyamide-66(PA-66) have been prepared by melt blending. Therheological behavior of PPS/PA-66 blends has been studied by means of capillary rheo-meter, and compared with PPS. The effects of shear rate, shear stress and temperature onthe flow of PPS/PA-66 blends and PPS are discussed. The non-Newtonian indexes andthe activation energies of viscous flow are obtained. The results show that the apparentviscosity of PPS/PA-66 blends is not sensitive to shear rate and stress, but decreases withthe elevation of temperature. On the contrary, the apparent viscosity of the PPS decreasesobviously with the increasing of shear rate and shear stress, but it is increased by theelevation of temperatue.     

聚酰亚胺对高性能树脂共混体系界面的反应增强

研究了以5-降冰片烯-2,3-二羧酸单甲酯为端基的PMR型聚酰亚胺(POI)作为界面介质对部分相容的聚醚砜/聚苯硫醚(PES/PPS)、聚醚醚酮/聚醚砜(PEEK/PES)共混体系的界面性质、形态结构及结晶行为的影响.结果表明,POI可以有效地增强两相间的界面粘结,显著降低PPS/PES共混物中PPS分散区的尺寸,改善两组分间的相容性.在熔融共混过程中,POI从本体向界面扩散并同PPS,PES产生交联和/或接枝,POI同PPS的反应活性远高于PES,但POI与PES发生反应.POI是PPS结晶的有效成核剂.     

聚苯硫醚的结晶形态及碳纤维的界面效应研究

本工作应用偏光显微镜、化学蚀刻及扫描电子显微镜等技术,研究了经不同方式热处理的聚苯硫醚(PPS)的结晶形态和不同碳纤维及玻璃纤维对PPS诱发结晶的能力及横晶的形态。并研究了这些不同结构形态的PPS的抗化学腐蚀性以及碳纤维的界面效应对它的影响。     

环状苯硫醚七聚体的分离与表征

聚苯硫醚(PPS)工业化生产中除了获得PPS外,还会产生较多的副产物,如氯化钠、低聚物等,其中副产的低聚物以浆料形式存在.这些副产物不能直接排放,否则会造成严重的环境污染.就PPS低聚物浆料而言,充分认识其组成是其资源化利用的关键.     

用X射线衍射分峰法研究固相热处理对聚苯硫醚结晶行为的影响

本文应用电子计算机对固相热处理的聚苯硫醚(PPS)粉末的X射线衍射图谱进行分峰处理。结果表明,固相热处理使PPS粉末的结晶度下降,同时其平均晶粒体积和垂直于分子链轴方向的晶粒基平面面积增大。与热分析的结果对比,讨论了PPS在固相热处理过程中所发生的物理与化学过程。     

聚苯硫醚的红外光声光谱研究

聚苯硫醚(PPS)树脂作为基体材料与碳纤维等增强剂制成的复合材料的各种应用在日益增加。但目前仍缺乏树脂基复合材料的基本物理、化学研究。本工作用光声光谱术探讨PPS基体的光谱性质,为进一步搞清以PPS为基的复合材料的微观机理,从而对复合材料的工艺过程和应用提供理论依据。     

聚苯硫醚合成新进展

聚苯硫酸(Polyphenylene Sulfide简称PPS)是一种性能优异的耐高温热塑性工程塑料,本文综述了近年来的主要的七种PPS的合成方法。     

INVESTIGATIONS ON THE CRYSTALLINE MORPHOLOGIES OF POLYPHENYLENE SULFIDE AND THE CARBON FIBRE SURFACE EFFECTS

By the use of polarized light microscopy, chemical etching and scanning electron micro-scopy, the erystalline morphologies of polyphenylene sulfide (PPS) have been studied. Thecrystalline morphologies of PPS are greatly affected by the curing conditions. Either gra-phite fibres and carbon fibres, or glass fibres, possess the ability of inducing the transcry-stallization of PPS at different degrees. The corrosive resistance of PPS resin is not onlyrelated with its chemical structure, but also with its aggregation structure, and furthermorewith the "interface effects" of carbon fibres in the composites.     

间接电解氧化法合成正丁醛

提出了一种合成正丁醛的新方法———间接电解氧化法 .在陶瓷隔膜电解槽中 ,用Pb/PbO2 作阳极 ,石墨作阴极 ,将Mn2 + 氧化成Mn3 + ,然后用Mn3 + 作氧化剂对正丁醇进行氧化获得正丁醛 ,还原所得的Mn2 + 可循环利用 .电解的优选条件为 :C硫酸 =4 .0mol/L ,电流密度 80 0A/m2 ,CMn(II) =0 .5mol/L ,温度t=2 0℃ .     

Phase separation in semicrystalline blends of poly(phenylene sulfide) and poly(ethylene terephthalate). II. Effect of poly(phenylene sulfide) homopolymer solubilization of PPS‐graft‐PET copolymer on morphology and crystallization behavior

The morphology and crystallization behavior of poly(phenylene sulfide) (PPS) and poly(ethylene terephthalate) (PET) blends compatibilized with graft copolymers were investigated. PPS‐blend‐PET compositions were prepared in which the viscosity of the PPS phase was varied to assess the morphological implications. The dispersed‐phase particle size was influenced by the combined effects of the ratio of dispersed‐phase viscosity to continuous‐phase viscosity and reduced interfacial tension due to the addition of PPS‐graft‐PET copolymers to the blends. In the absence of graft copolymer, the finest dispersion of PET in a continuous phase of PPS was achieved when the viscosity ratio between blend components was nearly equal. As expected, PET particle sizes increased as the viscosity ratio diverged from unity. When graft copolymers were added to the blends, fine dispersions of PET were achieved despite large differences in the viscosities of PPS and PET homopolymers. The interfacial activity of the PPS‐graft‐PET copolymer appeared to be related to the molecular weight ratio of the PPS homopolymer to the PPS segment of the graft copolymer (M_H/M_A). With increasing solubilization of the PPS graft copolymer segment by the PPS homopolymer, the particle size of the PET dispersed phase decreased. In crystallization studies, the presence of the PPS phase increased the crystallization temperature of PET. The magnitude of the increase in the PET crystallization temperature coincided with the viscosity ratio and extent of the PPS homopolymer solubilization in the graft copolymer. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 599–610, 2000     

SOLUTION PROPERTIES OF LADDER-LIKE POLYMER POLYPHENYLSILSESQUIOXANES

Solution properties of ladder-like polymer polyphenylsilsesquioxane (PPS) were studied by measurement of intrinsic viscosity, small angle laser light scattering and gel permeation chromatography. It was found that PPS can be modeled with a wormlike continuous cylinder rather than a wormlike coil. A plot of (M~2/[η])~(1/3) vs. M~(1/2) was employed in obtaining the persistence length (2λ)~(-1) and effective hydrodynamic diameter. When MW≤5×10~5, Mark-Houwink equation is adequate in describing the relationship between MW and [η] with αabout unity. This implies that PPS chain is semi-stiff. For GPC experiments, it was shown that universal calibration can be applied in PPS. When molecular weights of PPS are sufficiently high, their molecular weight distributions are often very broad.     

纳米花状MnO_2/PPS功能复合滤料的制备及其NH_3-SCR脱硝性能研究

首先采用表面活性剂十二烷基硫酸钠(SDS)对聚苯硫醚(PPS)滤料进行表面活化,由于SDS亲水基团(SO_4~–)与溶液中的H~+发生静电吸附作用,使得之后高锰酸钾在PPS滤料表面原位生成纳米花状二氧化锰,制得nf-MnO_2/PPS复合滤料;并通过探讨高锰酸钾与滤料的质量比、反应时间对nf-MnO_2/PPS复合滤料结构及性能的影响,从而得到最佳制备条件.并利用场发扫描电子显微镜(FESEM)、透射电子显微镜(TEM)、X-射线光电子能谱(XPS)、脱硝活性测试等分析手段对该复合滤料的结构和性能进行了研究;在其基础上利用原位聚合法,在复合滤料表面形成聚吡咯包覆层,制得nf-MnO_2/PPy@PPS复合滤料,并通过多种测试分析手段对改性滤料的结构和性能进行了研究.最后,脱硝测试结果显示,由最佳条件制备出的nf-MnO_2/PPS表现出了最优异的脱硝活性,其在80~180℃时的NO转化率达到36%~100%,nf-MnO_2/PPy@PPS表现出了更好的结合强度和催化稳定性能,但脱硝活性有所下降.     

聚苯硫醚及其聚醚砜共混物结晶动力学的研究

本文采用DSC方法,研究了聚苯硫醚及其聚醚砜共混物的等温结晶动力学。结果表明,经α-氯代萘处理后的聚苯硫醚原粉结晶速率常数有明显提高;聚苯硫醚/聚醚砜共混物的Avrami指数较纯聚苯硫醚低,共混物的结晶速率常数随共混组成变化出现最低值;共混物存在明显的二次结晶现象,t_(?)与t_(max)之间存在线性关系。     

Theoretical study of EPR spectra for Mn2+ ion in [Mg(H2O)6]SnCl6 single crystal

The relationship between the impurity structures and the electron paramagnetic resonance (EPR) parameters D, (a-F) have been studied by diagonalizing the complete energy matrices for Mn2+ ion in [Mg(H2O)6]SnCl6 single crystal in a trigonal ligand field within a weak-field-representation. It is shown that the local lattice structure around Mn2+ ion in [Mg(H2O)6]SnCl6 exhibits an elongation distortion which is different at 290 K and 77 K. The local structure parameters R=2.223+/-0.027A, theta=52.966+/-0.004 degrees and R=2.205+/-0.030A, theta=53.155+/-0.047 degrees for Mn2+ ion in [Mg(H2O)6]SnCl6 are determined at different temperatures 290 K and 77 K, respectively, and EPR parameters D and (a-F) can also get a satisfactory explanation simultaneously.     

Synthesis, crystal structure and magnetic properties of a novel manganese(II)-nitronyl nitroxide-azido(μ_(1,1) and μ_(1,3)) one-dimensional complex

A novel one-dimensional manganese(Ⅱ) complex containing nitronyl nitroxide radical [Mn2(IM2-py)2(Ac)2((μ1.1-N3)(μ1,3-N3) . EtOH]n was synthesized and characterized structurally and magnetically. It crystallizes in the monoclinic space group p21/n. Each Mn(Ⅱ) ion is six-coordinated in a distorted octahedral environment. The two N atoms of the nitronyl nitroxide radical and the two O atoms of acetate ligands are in the equatorial plane, whereas the two different azido bridging ligands are in trans axial position. Mn(Ⅱ) ions are linked by nitrogen atom of μ1,1-azido and oxygen atoms of two carboxy groups to form a Mn-Mn unit. Mn-Mn units are linked by azido ligands through u1,3 bridging style to form a one-dimensional chain. The compound is connected by the coordination bonds,π-π interactions and hydrogen bonds as a three-dimensional structure. Magnetic susceptibility data support that there are stronger antiferromagnetic interactions between the radical and Mn(Ⅱ) ion, weak antiferromagnetic inter     

Mechanical degradation of filter polymer materials: Polyphenylene sulfide

Polyphenylene sulfide (PPS) is known as a material resistant to high temperature and chemicals; however, there are arguments on the durability of PPS non-woven fabrics to chemicals, such as nitric acid (HNO₃), sulfuric acid (H₂SO₄), and hydrochloric acid (HCl). Therefore, this work aims at investigating the degradation of PPS non-woven fabrics in HNO₃, H₂SO₄ and HCl, and at confirming acid durability of PPS non-woven fabrics. In addition, this paper also studies the interaction among these three acids by measuring the retention of strength in binary or tertiary mixtures of these three acids. A discussion has been made on the acceleration/retardation of PPS degradation by the interactive effects, and also on the chemistry related to the degradation by these acids. Furthermore, there is a linear relationship between the nitric acid concentration and the proportion of carbon in the remaining PPS structures after 100 h of acid exposure. Also, this proportion of carbon is a good indicator of the retained strength in PPS fabrics.     

一维链状锰配合物的合成、结构及磁性研究

合成了邻硝基苯磺酰化丙氨酸配体2-NBS-AlaH (1)(2-NBS-AlaH=邻硝基苯磺酰化丙氨酸)及其锰的配合物[Mn(4，4′-bipy)(H₂O)₄]₂[(4，4′-bipy)₂(H₂O)₃(2-NBS-Ala)₄] (2)。通过X-射线单晶衍射测定了其结构：配体通过氢键形成了一维链状结构；配合物2中，4，4′-bipy把锰离子连成了一维链状结构。磁性研究表明，配合物由于分子间的自旋耦合呈现出弱的铁磁性。