PPEKK/PEI共混物的相容性及拉伸性能

作为相容体系 ,聚芳醚酮与聚醚酰亚胺 (ＰＥＩ)共混物体系的研究受到了研究者的重视[1～ 4] .由于现在已商品化的聚芳醚酮基本上都是半结晶型聚合物 ,所以有有关无定型聚芳醚酮与聚醚酰亚胺共混物的研究鲜见报道 .含二氮杂萘酮结构聚芳醚酮酮 (ＰＰＥＫＫ)是一种新型耐高温聚合物 ,相比于已经商品化的各种聚芳醚酮 ,ＰＰＥＫＫ除具有优异的综合性能外 ,它最大的特点表现在以下两方面 ,ＰＰＥＫＫ耐热性突出 ,玻璃化转变温度 (Ｔｇ)为 2 4 5℃左右 ,远高于各种商品化的聚芳醚酮 ;ＰＰＥＫＫ为无定型聚合物 ,易溶于多种有机极性溶剂 ,大大的扩…     

一种可溶性多氯取代的聚芳醚酮酮的合成

聚芳醚酮具有优异的机械性能、耐热性、耐化学腐蚀性等优点因而被广泛应用于航空航天、电子器件、机械仪表等领域．传统的聚芳醚酮由于其主链的规整性和刚性,使其难溶难熔,给加工和应用带来一定的困难．近20年来,人们不断开发新的品种,通过在聚合物分子主链中引入柔性的醚键、取代侧基(苯基、三氟甲基、甲基等)或者     

新型间位聚醚酮醚酮酮的合成与结晶

聚醚醚酮(ＰＥＥＫ)自八十年代初由英国ＩＣＩ公司开发并工业化以来,由于其优异的性能已在机械、航天等领域得到广泛应用.但ＰＥＥＫ的Ｔｇ只有143℃,影响了使用范围.因此其它聚芳醚酮类聚合物相继被开发出来.但这些聚芳醚酮的主链结构大都为全对位连接,使其熔点较高以至加工难度增大.因此,高Ｔｇ和低Ｔｍ的聚芳醚酮的合成是一项很有意义的工作.如果在聚合物的主链结构中引入间位结构,则可在对Ｔｇ影响较小的情况下降低熔点来改善加工条件[1,2].新型间位聚醚酮醚酮酮(ＰＥＫＥＫＫ(Ｔ/Ｉ))也是其中一种.本文主要研究ＰＥＫＥＫＫ(Ｔ/Ｉ)的合…     

聚醚醚酮醚酮的合成与表征

聚醚醚酮（ＰＥＥＫ）自工业化以来［１］，由于其优异的性能已在机械、航天等领域得到广泛应用．各种聚芳醚酮类聚合物相继被开发出来．但以亲电缩聚路线制备聚醚醚酮醚酮（ＰＥＥＫＥＫ）的报道较少［２］．本文以二苯醚和４－氟苯甲酰氯为主要反应试剂，采取付氏酰基化...     

反应型共聚醚酮酮及其关环产物的合成与表征

自从 8 0年代初英国ＩＣＩ公司[1] 将以 4,4′ 二氟二苯酮和氢醌为单体经溶液亲核取代反应合成的聚醚醚酮 (ＰＥＥＫ)投放市场以来 ,聚芳醚酮作为一类新型耐热高分子材料备受瞩目 .由于这类材料具有优异的绝缘性、良好的机械性能、自熄性以及高的耐辐射性等 ,在微电子和航天航空等高科技领域中广泛应用 .为了克服已工业化品种因为高的结晶性带来的难溶解、难溶融、难加工的缺点 ,90年代人们将目光投向合成无定形、可溶解的新型聚芳醚酮 ,比较成功的方法有[2～ 7] :( 1 )在分子主链中引入柔性基团 ;( 2 )采用不对称单体以减小聚合物的结晶性 …     

含磷聚醚醚酮酮砜的合成与表征

聚芳醚酮(PAEK)具有优良的热性能、机械性能、电绝缘性能及耐化学药品性,在航空航天、电子电器、核能工业以及民用高技术领域有着广泛的应用[1].聚芳醚酮熔融温度高且难溶于一般有机溶剂,不易加工.为改善聚芳醚酮的溶解性和加工性,可采取在主链中引入大的侧基、柔性基团、扭曲的非平面结构和采用共聚等方法[2～5].     

聚芳醚酮（砜）亚胺的裂解色谱质谱鉴定

本文通过对聚芳醚酮亚胺和聚芳醚砜亚胺两类聚合物的裂解色谱质谱的解析,归纳出适合于正确鉴定这两类新型聚合物的表征化合物。     

含氟聚芳醚酮的合成与性能研究

研究了含氟基团的引入对聚醚醚酮(PEEK)的介电常数、溶解性、结晶性和力学性能等的影响.结果表明,这种含氟聚芳醚酮在保持PEEK良好机械性能的条件下,介电常数达到2.7,且频率依赖性小,成膜性能好,成本比相应的含氟PI低5～10倍,有望成为一种极有实用价值的电子封装材料.同时利用合成的含氟单体合成了一系列不同-CF₃取代基含量的聚芳醚酮共聚物,研究了聚芳醚酮共聚物的介电常数与聚合物结构单元中-CF₃取代基含量的关系.结果表明,聚芳醚酮共聚物的介电常数随聚合物结构单元中-CF₃取代基含量的增加而线性降低.     

酚酞型聚芳醚砜 Ⅳ.含羧基聚芳醚砜的合成

离子性聚合物的合成方法主要集中于通过一些含芳环聚合物的大分子反应,引入不同的离子基。如聚苯乙烯、聚芳醚砜、聚芳醚酮的磺化反应及聚苯醚的羧化反应等。但伴随大分子反应,聚合物要发生严重的化学降解,并且引入离子基团数目也不易控制。 本工作将酚酞啉引入酚酞型聚芳醚砜,发现在弱碱K_2CO_3体系中酚酞啉仍能保持一定的反应活性,且不至于发生交联反应。通过与酚酞的共聚反应可方便地控制聚合物的羧化度。     

氢键型聚芳醚酮共聚物的合成与表征

氢键型聚芳醚酮共聚物的合成与表征王忠刚，陈天禄，徐纪平（中国科学院长春应用化学研究所长春１３００２２０）关键词氢键，聚芳醚酮，合成，表征高分子链之间的氢键相互作用可以有效地提高聚合物的性能［１，２］．本工作通过共聚反应，在酚酞型聚芳醚酮ＰＥＫ－Ｃ分子...     

结晶／结晶共混体系PPS／PEEK中PPS组分的结晶熔融行为（Ⅱ）──熔融条件对退火样品的影响

结晶／结晶共混体系ＰＰＳ／ＰＥＥＫ中ＰＰＳ组分的结晶熔融行为（Ⅱ）──熔融条件对退火样品的影响麦堪成，许家瑞，梅震，曾汉民（广州中山大学材料科学研究所，广州，５１０２７５）关键词聚苯硫醚，聚醚醚酮，结晶熔融行为，熔融双峰聚苯硫醚（ＰＰＳ）的结晶熔融行...     

亚砜还原法合成聚苯醚硫醚的结构与性能研究

以氟苯和氯化亚砜反应合成了4,4’-二氟二苯亚砜,并将其与4,4’二羟基二苯硫醚在N-甲基吡咯烷酮溶剂中进行亲核取代反应合成了聚苯醚硫醚醚亚砜,用乙二酰氯/四丁基碘化铵还原该亚砜聚合物制备了聚苯醚硫醚。用红外光谱和核磁共振谱对合成单体的结构进行了确认,同时对聚合物进行了红外光谱、核磁共振、元素分析、X射线光电子能谱、X射线衍射、DSC分析、TG/DTG以及溶解性测试。结果表明聚苯醚硫醚样品具有氧醚和硫醚交替的线性结构,特性粘度为0.55 dL/g的PPSE熔点达236℃,在氮气条件下,样品起始分解温度和最大分解速率处温度分别为359℃和514℃,在700℃时的重量保留率为43.3%,且在加热条件下能溶解于N-甲基吡咯烷酮(NMP)、二甲基乙酰胺(DMAc)、二甲基甲酰胺(DMF)等极性有机溶剂中。     

聚间苯硫醚和聚对苯硫醚的对比表征

聚对苯硫醚[poly(pphenylenesulfide),简称pPPS]的分子链是由对苯撑基和硫原子交替连接构成而使制品抗冲击能力差[1](有些研究者用共聚或共混的方法在pPPS中引入间位结构来达到减少其结晶度,增强韧性的目的)。余自力等[2]用硫磺溶液法合成了mPPS、pPPS及其共聚物,认为在pP...     

Miscibility predictions for poly(phenylene sulfide): Heats of mixing of model compounds

Calorimetry was used to gain insight into the thermodynamics of mixing of unlike species, designed to represent organic polymers. These results are to be useful in predicting miscibility between various polymers and poly(arylene sulfides). Phenyl sulfide (PS) and phenyl disulfide (PSS) were used as models for poly(phenylene sulfide) (PPS) and were mixed with model compounds that are representative of other polymer classes. The enthalpy of mixing was measured for a large number of combinations. The results are interpreted in terms of a summation of the effects of specific interactions and dispersive forces. It is seen from these data that the presence of aromatic side groups enhances the miscibility of the species with the poly(phenylene sulfide) model compound. Furthermore, exothermic heats of mixing were observed between the PPS model and compound. Furthermore, exothermic heats of mixing were observed between the PPS model and compounds that contain carbonyl, amide, or amine moieties. Finally, the sulfur atom in PPS seems to play only a minor role in determining its interactions with other species. Replacing sulfur with oxygen (or even an alkyl group) is seen to have very little effect on the heats of mixing results. © 1994 John Wiley & Sons, Inc.     

Synthesis of poly(sulfonium cation) as an alkylating reagent

Methyl 4-phenylthiophenyl sulfoxide is polymerized to poly(methyl-4-phenylthiophenylsulfonium) in poly(phosphoric acid) with a yield higher than 90%. The demethylation of poly(sufonium cation) is examined to control the composition ratio of the thiophenylene unit in the polycation. The polycation is soluble in common solvents due to the alternative structure of phenylene sufide and phenylenesulfonium cation and is easily converted to poly(phenylene sulfide) through the demethylation with a nucleophile. The poly(sulfonium cation) can be applicable as an alkylating agent for phenol, aniline and benzoic acid to the corresponding to anisole, N-methyl aniline, N,N-dimethyl aniline and benzoic methyl ester, respectively, with high conversion through the demethylation. These products can be isolated without a complicated purification because poly(phenylene sulfide) is precipitated in the mixture as the side product due to the poor solvent solubility.     

Thermal and dynamic mechanical properties of PES/PPS blends

Blends of poly(ether-sulfone) (PES) and poly(phenylene sulfide) (PPS) with various compositions were prepared using an internal mixer at 290°C and 50 rpm for 10 min. The thermal and dynamic mechanical properties of PES/PPS blends have been investigated by means of DSC and DMA. The blends showed two glass transition temperatures corresponding to PPS-rich and PES-rich phases. Both of them decreased obviously for the blends with PES matrix. On the other hand, T_g of PPS and PES phase decreased a little when PPS is the continuous phase. In the blends quenched from molten state the cold crystallization temperature of PPS was detected in the blends of PES/PPS with mass ratio 50/50 and 60/40. The melting point, crystallization temperature and the crystallinity of blended PPS were nearly unaffected when the mass ratio of PES was less than 60%, however, when the amount of PES is over 60% in the blends, the crystallization of PPS chains was hindered. The thermal and the dynamic mechanical properties of the PPS/PES blends were mainly controlled by the continued phase. This revised version was published online in August 2006 with corrections to the Cover Date.     

结晶／结晶共混体系聚苯硫酸／聚醚醚酮中聚醚醚酮组分的结晶熔融行为──熔融温度的影响

结晶／结晶共混体系聚苯硫酸／聚醚醚酮中聚醚醚酮组分的结晶熔融行为──熔融温度的影响麦堪成，许家瑞，梅震，曾汉民（中山大学材料科学研究所，广州，５１０２７５）关键词聚醚醚酮，聚苯硫醚，结晶／结晶共混物，结晶熔融行为近年来，高性能聚合物共混物如聚砜（ＰＳ...     

金属钠—硫磺法合成聚苯硫醚

以金属钠和硫磺为原料,六磷胺作溶剂合成了聚苯硫醚。本工作表明,反应分为两个阶段,首先硫八元环断裂生成了由硫化钠和六磷胺组成的中间产物,中间产物再与对二氯苯反应生成聚苯硫醚。本工作还对钠与溶剂的反应及反应中微量水的影响作了研究。     

SYNTHESIS AND MORPHOLOGICAL STRUCTURE OF POLY (PHENYLENE SULFIDE AMIDE)

Poly (phenylene sulfide amide) (PPSA) has been synthesized by using sulfur as Ssource which reacts with dichlorobenzamide (DCBA) and alkali in polar organic solvent atthe atmospheric pressure. The polymer structures were determined by elemental analysis,FT-IR and ~1H-NMR. It is shown that the yielded polymer has linear structure and itsstructure unit is -p-C_6H_4-CONH-p-C_6H_4-S-. The polymer morphology was studied byX-ray diffraction and polarized microscopy. The results show that PPSA is a crystallinepolymer and its spherulites are the aggregation of nontwisting lamella or micro-threadstructure. Under shearing force, these crystals are dispersed to form micro-fibrillarstructure. The decomposition kinetics of PPSA was also studied at different beating rates.The decomposition energy of PPSA is higher than that of PPS.     

Thermal decomposition mechanisms common to polyurethane,epoxy, poly(diallyl phthalate), polycarbonate and poly(phenylene sulfide)

Thermal decomposition of polyurethane, epoxy, poly(diallyl phthalate), polycarbonate, and poly(phenylene sulfide) was examined using a combination of thermal and chemical analysis techniques. Thermal gravimetric analysis with simultaneous analysis of evolved gases by Fourier transform infrared spectroscopy, differential scanning calorimetry, and gas chromatography coupled with Fourier transform infrared spectroscopy were used to obtain rate data, determine enthalpy changes, and identify decomposition products. Examination of the evolved decomposition products indicated a common set of chain scission mechanisms involving the aromatic moieties in each of the polymer materials studied.