共查询到20条相似文献,搜索用时 531 毫秒
1.
聚对苯硫醚,聚间苯硫醚及共聚物的合成与表征 总被引:2,自引:0,他引:2
用硫磺,对二氯苯和间二氯苯为原料,在极性有机溶剂六甲基磷酰三胺中合成了聚对苯硫醚,聚间苯硫醚及其共聚物。用裂解气相色谱,红外光谱,X-射线衍射及热分析对所得聚合物的结构和热性能进行了初步研究。结果表明:p-PPS和m-PPS都是结晶性聚合物,间位结构引入到p-PPS的结构中明显地破坏了p-PPS的高度结晶性,降低了耐热性,但最大失重速率处温度却无多大变化。这一共聚改性途径可望用于改进p-PPS的刚 相似文献
2.
3.
聚硫醚酮单体及树脂的制备 总被引:1,自引:0,他引:1
研究了以4,4'-二氯二苯酮和硫化钠为单体制备聚硫醚酮的工艺,以及4,4'-二氯二苯酮的制备工艺,对影响因素进行了详细分析。并利用傅里叶红外光谱仪和差示扫描量热仪对聚合物的结构和性能进行了研究。 相似文献
5.
以液体聚硫醚橡胶作为密封剂的生胶、环氧树脂(EP)作为硫化剂,成功制备出一种综合性能良好的新型聚硫醚密封剂。结果表明:聚硫醚橡胶的热分解温度(296.4℃)高于聚硫橡胶(281.0℃),热循环后聚硫醚密封剂的拉伸强度变化率或断裂伸长率变化率(31%或42%)均低于聚硫密封剂(45%或64%),说明前者的耐高温性能优于后者;聚硫醚密封剂对多种基材表现出稳定的粘接性能,其常温剥离强度均超过7.5 kN/m(均为内聚破坏),并且其在60℃盐水/航空煤油双层液中浸泡7 d后仍为内聚破坏;聚硫醚密封剂受温湿度影响较小,其硫化速率较大,并且其硫化效果和加工性能良好。 相似文献
6.
聚硫醚酰亚胺树脂的合成及改性环氧胶粘剂的研制 总被引:1,自引:1,他引:1
利用4,4’-二羟基二苯硫醚(44DHDPS)、碳酸钾和4-氯硝基苯(4CNB),在N,N-二甲基甲酰胺和甲苯的混合溶剂中回流反应,合成得到了4,4’-双(4-硝基苯氧基)二苯硫醚(DNDPS):随后,在钯/炭和水合肼体系中还原得到4,4’-双(4-氨基苯氧基)二苯硫醚(DADPS),并与2,2-双(4-(3,4-二羧基苯氧基)苯基1丙烷二酐(BPADA)进行聚合反应,脱水亚胺化,得到聚硫醚酰亚胺(PTEI)树脂。采用聚硫醚酰亚胺树脂对环氧胶粘剂进行改性,效果良好。 相似文献
7.
8.
9.
油脂基表面活性剂因性价比高、对环境友好而受到广泛关注,本文以月桂酰氯与二苯硫醚经过傅-克酰基化反应制备十二酰基二苯硫醚中间体,然后经磺化和中和合成新型油脂基表面活性剂十二酰基二苯硫醚磺酸钠,并用FT-IR、1H NMR和HPLC等方法表征了中间体和产物的结构和含量。性能测试结果表明十二酰基二苯硫醚磺酸钠的克拉夫特点(TK) < 0 oC,25 oC时cmc和γcmc分别为4.38×10-4 mol/L和37.63 mN/m,钙皂分散力为26%(wt%),并能分别在9.7%(wt%) NaOH、14.5%(wt%) CaCl2、24.3%(wt%) NaCl和30.9%(wt%) HCl水溶液中溶解。实验结果表明其具有优秀的低温溶解性,较好的抗钙皂形成能力和优异的耐电解质性能。 相似文献
10.
该文以月桂酰氯与二苯硫醚经过傅-克酰基化反应制备十二酰基二苯硫醚中间体,然后经磺化和中和合成油脂基表面活性剂十二酰基二苯硫醚磺酸钠,并用FTIR、1HNMR和HPLC等方法表征了中间体和产物的结构和含量。性能测试结果表明,十二酰基二苯硫醚磺酸钠的克拉夫特点(TK)<0℃,25℃时CMC和γCMC分别为4.38×10-4mol/L和37.63 mN/m,钙皂分散力为26%,并能分别在质量分数9.7%NaOH、14.5%CaCl2、24.3%NaCl和30.9%HCl水溶液中溶解。实验结果表明,其具有优秀的低温溶解性,较好的抗钙皂形成能力和优异的耐电解质性能。 相似文献
11.
12.
13.
The thermal behavior of poly(phenylene sulfide) (PPS) blends with poly(ether imide) (PEI) was studied by differential scanning calorimeter (DSC). The crystallization temperature of PPS in blends shifted from 216.8°C to 226.4°C upon addition of 20–70% PEI contents. The heat of crystallization remained unchanged with less than 50% PEI in blends, whereas the heat of fusion decreased with increasing PEI content. The isothermal crystallization indicated that incorporating PEI would accelerate the crystallization rate of PPS. The activation energy of crystallization increased with addition of PEI. The equilibrium melting point of PPS/PEI blends was not changed with compositions. 相似文献
14.
Poly(aryl ether sulfide)s have been produced by nucleophilic aromatic substitution with phenoxide nucleophiles bisphenol A and bisphenol AF, and the activated arylfluorides bis(4-fluorophenyl)sulfide and 2,7-difluorothianthrene. The resulting polymers are thermally stable, amorphous materials that have been characterized by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and gel permeation chromatography (GPC). Moderate molecular weights have been achieved, representative of greater than 98% conversion of arylfluorides. The poly(aryl ether thianthrene)s are flame resistant and self extinguish within 0.2 s upon removal from a flame source. TGA of the poly(aryl ether thianthrene)s in an inert atmosphere result in a char yield greater than 50% at 750 °C. The flame resistant properties are more effectively modeled by TGA in an inert atmosphere as compared to TGA in an air atmosphere. The poly(aryl ether thianthrene)s are found to have high refractive index values, 1.61-1.70, depending on wavelength and bisphenol composition. 相似文献
15.
Tao Liu Hengwu Liu Lingli Li Xianzhong Wang Ai Lu 《Polymer-Plastics Technology and Engineering》2013,52(5):440-445
A series of microcellular poly (phenylene sulfide) (PPS) foams were prepared by Mucell injection molding. The cell structure, mechanical properties, crystallization behavior and dielectric property of microcellular PPS foams were systemically investigated. The results showed that the longer the length of flow passage of injection mold, the larger cell size of microcellular PPS foams. The injection parameter of shot size played an important role in relative density of microcellular PPS foams. When the relative density of microcellular PPS foam reached to 0.658, the tensile strength, flexural strength and impact strength of PPS foam materials achieved 10.82 MPa, 52.99 MPa and 0.305 J/cm2, respectively. Meanwhile, with the relative density decreasing, the dielectric constant of PPS foam materials reduced, while the volume resistivity of its uprated. 相似文献
16.
17.
采用原位聚合法制备了纳米羟基磷灰石(n-HA)/聚苯硫醚共聚物(PPS-COOCH 3)复合材料(n-HA/PPS-COOCH 3)。研究了n-HA的加入对复合材料的结晶行为、热学性能、亲水性能的影响。采用透射电子显微镜(TEM)观察了复合材料中无机纳米粒子的大小及分散情况。结果表明,共聚物和复合材料都属于结晶性物质,n-HA在复合材料中保持了原来的结晶形态。n-HA的加入可以提高复合材料的亲水性和热稳定性,适量的n-HA可作为异相成核剂增加复合材料中聚合物的结晶度。n-HA在复合材料中分布均匀且保持了纳米状态。 相似文献
18.
王永杰;李艳;卢艾;许轶;余雪江;王宪忠 《中国塑料》2010,24(6):45-49
采用熔融共混的方法制备了聚苯硫醚( PPS) / 钕铁硼(NdxFe94?xB6) 复合材料,分析了复合材料的形态、力学性能及电磁性能。结果表明,均匀分散的NdxFe94?xB6粒子与PPS 基体界面结合紧密;与纯PPS 相比,NdxFe94?xB6添加量为50%时,复合体系的拉伸强度、弯曲强度和冲击强度分别提高了100%、44%和800%;但过多的NdxFe94?xB6填充量反而不利于材料力学性能的提升;复合材料的介电常数和磁导率都随含量增加而增大,在高含量下,介电常数虚部随频率明显变大。通过对复合材料反射衰减计算,匹配厚度d=2mm时,复合材料在高频段出现明显的吸收峰,特别是含量50 %时,吸收峰达到-18.3 dB,对应的频率为16.6 GHz。 相似文献
19.
Shuling Deng Baofeng Xu Hubin Lin Chongmin Du 《Polymer-Plastics Technology and Engineering》2015,54(10):1017-1024
Differential scanning calorimetry and polarized optical microscopy methods were used to investigate the crystallization behavior and isothermal crystallization kinetics of poly(phenylene sulfide) (PPS)/carbon nanotube (CNT) and PPS/CNT/carbon fiber (CF) composites. In this article, the influences of CNT and CF on PPS crystallization behavior are explained. The thermal conductivity properties of composites were studied using the laser flash method. The results show that CNT increased crystallization temperature and rate and thermal conductivity greatly improved at 8 wt.% CNT content. In addition, the crystallization and thermal performance of PPS are significantly improved via synergistic effects of CNT and CF in the composites. 相似文献