双邻位甲基取代聚芳醚酮酰亚胺的合成与性能研究

N,N′-(4,4′-二苯甲烷)-二偏苯三甲酰亚胺酰氯(DIDC-M)分别与4,4′-二(2,6-二甲基-苯氧基)二苯酮(o-Me2-DPOBP)和4,4′-二(2,6-二甲基-苯氧基)三苯二酮(o-Me2-DPOTPDK)进行低温溶液共缩聚,合成了两种含双邻位甲基侧基和主链含亚胺结构的聚醚酮醚酮酰亚胺(o-Me2-PEKEKI-Pa)及聚醚酮酮醚酮酰亚胺(o-Me2-PEKKEKI-Pb)共聚物.用FT-IR,1H-NMR,DSC,TGA和WAXD对共聚物的结构和性能进行了表征.研究表明Pa和Pb均为非晶态结构;具有较高的玻璃化转变温度(Pa为240℃,Pb为237℃);能溶解于DMF、DMAc、NMP、二氯甲烷、氯仿等普通有机溶剂中,溶剂挥发后成膜性良好,可制成透明薄膜.共聚物Pa,Pb的拉伸强度分别为80.0MPa,51.8MPa,断裂伸长率6.9%,4.6%,杨氏模量2.0GPa,1.8GPa.     

甲基取代的聚芳醚酮酮酰亚胺树脂的合成与性能

N,N′-(4,4′-二苯甲烷)-二偏苯三甲酰亚胺酰氯(DIDC-M)与4,4′-二(2-甲基-苯氧基)三苯二酮(o-Me-DPOTPDK) 进行低温溶液共缩聚,制备了甲基侧基取代的聚芳醚酮酮酰亚胺(o-Me-PEKKI)聚合物.用FT-IR,1H-NMR,DSC,TG 和WAXD对聚合物的结构和性能进行了表征.研究表明:聚合物为非晶态结构;具有较高的玻璃化转变温度(Tg:241 ℃)和较好的耐热性能(Td:487 ℃);能溶解于间甲酚、NMP、氯仿、四氯乙烷等有机溶剂中.     

聚醚酮醚酮酮/含萘环聚醚酮醚酮酮无规共聚物的合成与性能

在无水AlCl3及N－甲基吡咯烷酮（NMP）存在下，以4,4′-二（α－萘氧基）二苯酮（DNBP）作为第三单体，将其与4，4′－二苯氧基二苯酮（DPBP）和对苯二甲酰氯（TPC）在1，2－二氯乙烷（DCE）中进行低温溶液共缩聚反应，合成了一系列聚醚酮醚酮酮／含萘环聚醚酮酮醚酮酮无规共聚物，用IR、DSC、TG及WAXD等方法对其结构和性能进行了表征与测试。研究结果表明共聚物的玻璃化转变温度（Tg)要比纯PEKEKK的高，而其熔融温度（Tm)和结晶度（Xc)则随共聚物中含萘环PEKEKK结构单元含量的增加而逐渐降低。共聚物具有优异的耐热性能及抗腐蚀性能。     

新型含萘环聚芳醚酮无规共聚物的合成与表征

以无水AlCl3/ClCH2CH2Cl/NMP为催化剂／溶剂体系，由4，4'-二（α－萘氧基）二苯酮（DNBP），4、4'-二苯氧基二苯酮（DPOBP）和对苯二甲酰氯（TPC）通过低温溶液共缩聚反应，合成了一系列聚醚酮醚酮酮（PEKEKK）／含萘环聚醚酮醚酮酮无规共聚物。考察了单体浓度，反应时间对聚合物分子量的影响，并对其进行了IR、DSC、TG、XRD等表征。     

4,4′-二(2-甲基苯氧基)二苯砜/1,4-二苯氧基苯/对苯二甲酰氯三元共缩聚物的合成与表征

通过加入第三单体4,4′-二(2-甲基苯氧基)二苯砜与1,4-二苯氧基苯(DPB)和对苯二甲酰氯(TPC)进行三元无规共聚,合成了一系列分子主链带砜基和主链芳环上含甲基侧基的聚(芳醚砜醚酮酮-co-醚醚酮酮)共聚物,并用FT-IR、DSC、WAXD和TG对其进行了表征.结果表明,共聚物的玻璃化转变温度随着第三单体摩尔含量的增加而逐渐升高,熔融温度则逐渐降低,当其摩尔含量为10%~30%时,共聚物具有优良的耐热性能及耐溶剂、耐酸碱性能.     

4,4＇-二苯氧基二苯砜、4,4＇-二苯氧基二苯酮、对苯二甲酰氯三元共聚物的合成

聚醚酮醚酮酮;4;4＇-二苯氧基二苯砜、4;4＇-二苯氧基二苯酮、对苯二甲酰氯三元共聚物的合成;聚醚砜醚酮酮;低温溶液浓缩聚     

主链含多羰基结构单元聚芳醚酮的合成与性能

在无水三氯化铝(AlCl3)和N,N-二甲基乙酰胺(DMAc)存在下,以1,2-二氯乙烷(DCE)为溶剂,1,3-二(4-氯甲酰基苯甲酰基)苯(DMBC)分别与4,4′-二苯氧基二苯砜(DPODPS)、1,3-二(4-苯氧基苯甲酰基)苯(i-DPOPKK)、1,4-二(4-苯氧基苯甲酰基)苯(p-DPOPKK)进行低温溶液共缩聚反应,合成了3种主链含多羰基结构单元的聚芳醚酮聚合物.用FT-IR1、H-NMR、DSC、TGA、WAXD等技术对聚合物进行结构和性能表征.结果表明:增加聚合物主链中羰基的含量可提高其耐热等级;同时,由于聚合物中羰基比例的增大,其聚集态晶体结构也产生相应的变化,较易产生多晶型.     

4,4′-二(2-甲基苯氧基)二苯砜/1,4-二苯氧基苯/对苯二甲酰氯三元共缩聚物的合成与表征*

通过加入第三单体4,4'-二(2-甲基苯氧基)二苯砜与1,4-二苯氧基苯(DPB)和对苯二甲酰氯(TPC)进行三元无规共聚,合成了一系列分子主链带砜基和主链芳环上含甲基侧基的聚(芳醚砜醚酮酮-co-醚醚酮酮)共聚物,并用FT-IR、DSC、WAXD和TG对其进行了表征.结果表明,共聚物的玻璃化转变温度随着第三单体摩尔含量的增加而逐渐升高,熔融温度则逐渐降低,当其摩尔含量为10%～30%时,共聚物具有优良的耐热性能及耐溶剂、耐酸碱性能.     

聚醚砜醚酮的合成与性能

以4,4′-二羟基二苯砜和4,4′-二氟二苯酮为单体, 通过溶液缩聚合成了聚醚砜醚酮(PESEK), 其分子结构相当于聚醚砜(PES)与聚醚醚酮(PEEK)的交替共聚物. 在共聚物分子中, 存在砜基、醚基和酮基, 整个结构单元形成了大共轭体系, 聚合物属无定形聚合物, 玻璃化转变温度(Tg)为198 ℃, 介于PEEK和PES的Tg之间, 其热稳定性和加工性能优于PES, 而力学性能与PES接近.     

新型含环氧端基聚芳醚酮的合成及表征

以 4,4′ 二氟二苯酮和 4 (4 羟基苯基 ) 2 ,3 二氮杂萘 1 酮经亲核取代逐步聚合制得含二氮杂萘酮结构的聚芳醚酮低聚物 ,再与环氧氯丙烷反应制得了所需分子量的含环氧端基的聚芳醚酮 (E PPEK) .用FT IR和1H NMR表征了分子链结构 ,并测定了聚合物的玻璃化转变温度Tg 和溶解性 .     

Chromium(VI) oxide-mediated oxidation of polyalkyl-polypyridines to polypyridine-polycarboxylic acids with periodic acid

4,4′-Dicarboxy-2,2′-bipyridine was synthesized quantitatively by chromium(VI) oxide-mediated oxidation of 4,4′-dimethyl-2,2′-bipyridine or 4,4′-diethyl-2,2′-bipyridine with periodic acid as the terminal oxidant in sulfuric acid. 5,5′-Dicarboxy-2,2′-bipyridine and 6,6’-dicarboxy-2,2′-bipyridine were also synthesized by the method from the corresponding dimethyl bipyridines in excellent yields. 4,4′,4″-Tricarboxy-2,2′:6′,2″-terpyridine was obtained in 80% yield from 4,4′,4″-triethyl-2,2′:6′,2″-terpyridine, and 4,4′,4″,4′″-tetracarboxy-2,2′:6′,2″:6″,2′″-quaterpyridine was obtained in 72% yield from 4,4′,4″,4′″-tetraethyl-2,2′:6′,2″:6″,2′″-quaterpyridine by the same procedure.     

Synthesis and Characterization of Soluble Reactive Copoly (aryl ether ketone ketone)

Poly (aryl ether ketone)s are a category of high performance engineering plastics, widely used in electronic, electric, and military industries1. For their general excellent properties, many new products are developed. In recent years, much attention has been paid to synthesize soluble or reactive poly (aryl ether ketone)2,3. In this letter, we report the synthesis of a novel soluble reactive copoly (aryl ether ketone ketone) from 2,2-p-hydroxyphenyl-iso-propane 3, functionalized chemical 1, a…     

Synthesis of high molecular weight poly(ether ketone)s by polycondensation of activated bis(aryl chloride)s with bisphenolates

The ability to achieve high molecular weight poly(ether ketone)s from the polycondensation of bis(aryl chloride)s with bis(phenolate)s has been consistently demonstrated. The polymerizations presented here help to delineate for specific bis(aryl chloride)/bisphenolate pairs the reaction conditions required to obtain high molecular weight polymers. Polycondensation of 1,3-bis(4-chlorobenzoyl)-5-tert-butylbenzene ( 6 ) and 2,2′-bis(4-chlorobenzoyl)-biphenyl ( 15 ) with various bisphenolates as well as of 2,2′-bis(4-hydroxyphenoxy)biphenyl ( 33 ) with 4,4′-dichlorobenzophenone ( 41 ) and 1,3-bis(4-chlorobenzoyl)benzene ( 43 ) were used as representative model systems to select reaction conditions that led to high molecular weight polymers. © 1995 John Wiley & Sons, Inc.     

Synthesis and characterization of fluoropolymers by the polyaddition of bis(epoxide)s with dicarboxylic acids and diols

The synthesis and characterization of the fluoropolymers poly 1a – 1d and poly 2a – 2d with pendant hydroxyl groups were examined. The polyaddition of bis(epoxide)s [2,2′‐bis(4‐glycidyletherphenyl)hexafluoropropane and bisphenol A diglycidyl ether] with dicarboxylic acids (tetrafluoroterephthalic acid and terephthalic acid) and diols [2,2′‐bis(4‐hydroxyphenyl)hexafluoropropane, 2,2′,3,3′,5,5′,6,6′‐octafluoro‐4,4′‐biphenol, 1,4‐bis(hexafluorohydroxyisopropyl)benzene, and 1,3‐bis(hexafluorohydroxyisopropyl)benzene] was carried out at 50–100 °C for 6–48 h in the presence of quaternary onium salts (tetrabutylammonium bromide, tetrabutylammonium chloride, tetrabutylphosphonium bromide, and tetrabutylphosphonium chloride; 2.5 mol %) as catalysts in dimethyl sulfoxide, N‐methylpyrrolidone, dimethylformamide, dimethylacetamide, dioxane, diglyme, o‐dichlorobenzene, chlorobenzene, and toluene to afford the corresponding polymers, poly 1a – 1d and poly 2a – 2d , with number‐average molecular weights of 11,000–59,400 in 45–97% yields. The solubility of the obtained polymers was good, and their thermal stability might be assumed from their structures. A linear relationship was observed between the contents of the fluorine atoms and the refractive indices. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 1395–1404, 2002     

Synthesis and properties of fluorine‐containing polyethers with pendant hydroxyl groups by the polyaddition of bis(epoxide)s with diols

Fluorine‐containing polyethers with pendant hydroxyl groups were synthesized by the polyaddition of fluorine‐containing bis(epoxide)s with certain fluorine‐containing diols with quaternary onium salts as catalysts. When the polyaddition was performed with 2,2′,6,6′‐tetrafluoro‐4,4′‐biphenol diglycidiyl ether and 2,2′,6,6′‐tetrafluoro‐4,4′‐biphenol, the corresponding polyether with pendant hydroxyl groups was successfully obtained in good yield. The polyaddition of certain fluorine‐containing bis(epoxide)s with diols also proceeded in bulk to provide the corresponding fluorine‐containing polyethers with high molecular weights. These polyethers were highly transparent at 157 nm for 0.1 μm thickness, with their transmittance of 14–75% at 157 nm. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 2543–2550, 2004     

Synthesis and properties of poly(amic acid)s and polyimides based on 2,2′,6,6′‐biphenyltetracarboxylic dianhydride

Poly(amic acid)s (PAAs) having the high solution stability and transmittance at 365 nm for photosensitive polyimides have been developed. PAAs with a twisted conformation in the main chains were prepared from 2,2′,6,6′‐biphenyltetracarboxylic dianhydride (2,2′,6,6′‐BPDA) and aromatic diamines. Imidization of PAAs was achieved by chemical treatment using trifluoroacetic anhydride. Among them, the PAA derived from 2,2′,6,6′‐BPDA and 4,4′‐(1,3‐phenylenedioxy)dianiline was converted to the polyimide by thermal treatment. The heating at 300 °C under nitrogen did not complete thermal imidization of PAAs having glass‐transition temperatures (T_g)s higher than 300 °C to the corresponding PIs. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 6385–6393, 2006     

Synthesis and Characterization of Novel Organosoluble Methyl Substituted Poly(aryl Ether Ketone)s Containing Sulfone Linkage

Several new methyl substituted poly(aryl ether ketone)s containing sulfone linkage with inherent viscosities of 0.62–0.84 dL/g have been prepared from 4,4′‐bis(2‐methylphenoxy)diphenylsulfone and 4,4′‐bis(3‐methylphenoxy)diphenylsulfone with terephthaloyl chloride and isophthaloyl chloride by electrophilic Friedel‐Crafts acylation in the presence of DMF with anhydrous AlCl₃ as a catalyst in 1,2‐dichloroethane, respectively. These polymers having weight‐average molecular weight in the range of 71,000–49,000 are all amorphous and show high glass transition temperatures ranging from 167 °C to 191 °C, excellent thermal stability at temperatures over 400 °C in air or nitrogen, high char yields of 51–58% in nitrogen and good solubility in CHCl₃ and polar solvents such as DMF, DMSO and NMP at room temperature.     

Synthesis of 2,7-disubstituted-4,5,9,10-tetraazapyrenes

2,7-Dimethyl-4,5,9,10-tetraazapyrene (VI) was synthesized by the catalytic hydrogenation of 4,4′-dimethyl-2,2′,6,6′-tetranitrobiphenyl (IIa) with W-2 Raney nickel in the presence of alkali. 4,4′-Dicarbomethoxy-2,2′,6,6′-tetranitrobiphenyl (IIc) under similar conditions in neutral medium gave 4,4′-dicarbomethoxy-2,2′,6,6′-tetraaminobiphenyl (IV) which on oxidation gave 2,7-dicarbomethoxy-4,5,9,10-tetraazapyrene (V). 2,7-Dimethyl-, 2,7-dimethoxy-, and 2,7-diacetamido-4,5,9,10-tetraazapyrene di-N-oxides (III a,b,c) were obtained by catalytic reduction of the corresponding 4,4′-disubstituted-2,2′,6,6′-tetranitrobiphenyls with W-7 Raney nickel in the presence of alkali. Compound VI on oxidation with hydrogen peroxide gave the di-N-oxide (IIIa).     

新型含环己烯结构的氮杂环聚醚聚合物的合成

用新型聚合单体 1 甲基 4,5 二 (4 氯代苯甲酰基 )环己烯与 4 (4 羟基苯基 ) 2 ,3 二氮杂萘 1 酮、4,4′ 二氯二苯砜单体经亲核共缩聚反应 ,成功地合成了含环己烯结构的杂环联苯型聚醚系列聚合物 .用FT IR、1 H NMR、DSC、X 射线衍射等方法对聚合物进行了表征 ,并研究了聚合物的溶解性能 .结果表明 ,这系列聚合物是具有较高的玻璃化温度的可溶性无规共聚物 .聚合物含有不饱和双键结构 ,可作为交联聚合物、接枝聚合物及其它特种高分子材料的中间体 .而且通过二元或三元聚合 ,来改变交联点和接枝点的密度 ,为进一步得到结构更加多样化与性能各异的聚芳醚的交联聚合物、接枝聚合物及其它特种高分子材料 ,提供一个良好的基础     

Antimicrobial and antispasmodic tetrahydroanthracenes from Cassia singueana

Four tetrahydroanthracene derivatives with antimicrobial and antispasmodic activities have been isolated from Cassia singueana. The evidence described in the following indicates them to be torosachrysone (1), germichrysone (4), and two new dimeric tetrahydroanthracenes, singueanol-I (7) or 6,6′-dimethoxy-3, 3′,8,8′,9,9′-hexahydroxy-3,3′,7,7′-tetramethyl-3,3′,4,4′-tetrahydro(10,10′-bianthracen)-1,1′(2H,2′H)-dione, and singueanol-II (8) or 6,6′-dimethoxy-3,3′,8,8′,9,9′-hexahydroxy-3,3′,7,7′-tetramethyl-3,3′,4,4′-tetrahydro(5,10′-bianthracen)- 1′(2H,2′H)-dione.