双噁唑啉对聚碳酸1,2-环己二酯的扩链研究

采用马来酸酐封端聚碳酸1,2-环己二酯(PCHC),使其末端羟基转变为端羧基(MA-PCHC),并以2,2'-双-(2-噁唑啉)(BOZ)为扩链剂进行扩链反应.研究发现,BOZ与MA-PCHC中的羧基等摩尔情况下,扩链效果最佳.扩链后的PCHC的数均分子量从扩链前的5.6×104增长到12.4×104.扩链后的PCHC...     

一种含三氟甲基和咕吨结构聚酰胺的合成与性能

在浓硫酸和3-巯基丙酸催化下,3'-三氟甲基苯基-2,2,2-三氟苯乙酮(1)和甲苯于40～50℃下缩合反应8 h,制得中间体-1,1-二(4-甲基苯基)-1-(3'-三氟甲基苯基)-2,2,2-三氟甲基乙烷(2),继而在光照和N-溴代丁二酰亚胺促进下,将中间体氧化得到二羧酸-1,1-二(4-羧基苯基)-1-(3'-三...     

新型环蕃二茂铁二甲酸二羟乙苯胺酯的合成及表征

以二茂铁为原料, 通过合成1,1'-二乙酰基二茂铁、1,1'-二茂铁二甲酸、1,1'-二茂铁二甲酰氯, 在高度稀释条件下与4种二羟乙基苯胺进行酯化反应得到了1,9-二羰基-2,8-二氧-5-(4-氟)苯基氮[9]二茂铁酯环蕃a, 1,9-二羰基-2,8-二氧-5-(4-甲基)苯基氮[9]二茂铁酯环蕃b, 1,9-二羰基-2,8-二氧-5-(4-甲氧基)苯基氮[9]二茂铁酯环蕃c, 1,9-二羰基-2,8-二氧-5-(4-硝基)苯基氮[9]二茂铁酯环蕃d. 用UV、¹H NMR、FT-IR、元素分析和基质辅助激光解析电离-飞行时间质谱(MALDI-TOF)对这些化合物进行了表征. 培养了二茂铁酯环蕃a的单晶, 并对其结构进行了解析.     

二甲基取代杂环联苯聚芳醚的合成与性能

由自制的二甲基取代类双酚4-(3,5-二甲基-4-羟基苯基)-2,3-二氮杂萘-1-酮(DM-HPPZ)单体和4,4'-二氟二苯酮、4,4'-二氯二苯砜进行亲核缩聚反应,制备了一类新型的二甲基取代聚芳醚酮、聚芳醚砜及其共聚物聚芳醚砜酮树脂材料.在适宜的聚合条件下,获得了高分子量的聚合物,其特性粘度为0.44～0.75DL·g^-1.利用DSC和TGA研究了聚合物的耐热性能,结果表明,新型聚芳醚玻璃化温度高(568～595K),耐热稳定性好(5%热失重温度大于416℃);拉伸强度为45.4～85.0MPa,力学性能优良.新型聚芳醚在氯仿、DMAc等极性有机溶剂中可溶解并浇铸得到透明、韧性高的薄膜.共聚物结合了聚醚酮好的力学性能和聚醚砜高的耐热性的特点,因此综合性能更佳.     

含二氮杂萘酮联苯结构的聚芳醚腈共聚物的合成及其性能

以类双酚单体4-(4-羟基苯基)-2,3-二氮杂萘-1-酮,2,6-二氯苯腈和对苯二酚为原料,K2CO3为催化剂,通过溶液聚合法合成了含二氮杂萘酮联苯结构的聚芳醚腈共聚物(1),其结构和性能经FT-IR,GPC,DSC和TGA表征。结果表明,1的Mn为2.03×104,Mw为4.35×104,1具有良好的热性能及溶解性。     

全叶马兰中两个新的黄酮类化合物

利用多种色谱分离方法对全叶马兰(Kalimeris integrifolia)的化学成分进行研究,从其地上部分的乙醇提取物中分离得到两个化合物,应用HR-ESIMS,1D和2D NMR,IR,UV等多种波谱技术确定了化合物的化学结构,经鉴定分别为5,8-二羟基-2-(3-羟基-4,5-二甲氧苯基)-6,7-二甲氧基-4H-色烯-4-酮(1)和5-羟基-6,7-二甲氧基-2-(4'-甲氧基苯基)-4-氧代-4H-色烯-8-(2'-甲基丁酸酯)(2).化合物1和2为两个新的黄酮类化合物.     

新荧光试剂5-(4'-卤代-2'-羧基苯偶氮)绕丹宁的合成及分析化学特性研究

合成了三种新荧光试剂,5-(4'-氯-2'-羧基苯偶氮)绕丹宁(CRACP.2).5-(4'-溴-2'-羧基苯偶氮)绕丹宁(BRACP,3)及5-(4'-碘-2'-羧基苯偶氮)绕丹宁(IRACP,4).研究了它们的吸收光谱及荧光性质.探讨了分子结构与荧光性能的关系.建立了铜(Ⅱ)的荧光分析方法.在pH5.3时.CRACP与铜( Ⅱ) 形成荧光螯合物, λ~ e~ x/ λ~e~m=310nm/408nm.检测限为5×10^-^4μg/g.     

侧链含萘可交联聚芳醚酮的合成及性能

以4,4'-二羟基苯基正戊酸和4,4'-二氟二苯酮为原料, 二甲基亚砜(DMSO)为溶剂, 采用亲核取代反应合成侧基含羧基的聚芳醚酮均聚物, 进一步与1-萘酚和2-萘酚接枝制备新型含萘可交联聚芳醚酮. 用核磁共振(NMR)、红外光谱(FTIR)、示差扫描量热(DSC)和热重分析(TGA)表征其结构和性能, 含萘聚芳醚酮在常用有机溶剂如N,N-二甲基乙酰胺(DMAc)、DMSO, 四氢呋喃(THF)中有良好的溶解性, 并具有很好的成膜性. DSC测试结果显示, 在170℃热处理2 h的交联聚合物的玻璃化转变温度(T_g)提高40℃. TGA数据显示接枝后的聚合物的5%热失重温度提高40~50℃, 证明其发生交联反应. 结果表明, 新型含萘可交联聚芳醚酮具有热固性树脂的耐溶剂和耐高温特性, 进一步拓宽了聚芳醚酮的应用前景.     

固相熔融合成含4,4'-联吡啶二阳离子的哑铃型化合物

2-{2-[4-苯基-二(4-特丁基苯基)甲基]苯氧基}乙氧乙醇磺酸酯(2.1 mmol)与4,4'-联吡啶(1.0 mmol)混合, 加热到融化, 搅拌10 min, 用石油醚洗涤反应混合物, 得到定量的哑铃型化合物.     

顺式和反式-2-氨基-3-氰基-4-苯基-1-(4'-甲基苯基)-2-环戊烯-1-醇的合成和晶体结构

用低价钛试剂(TiCl4-Zn)与4, 4-二氰基-3-苯基-1-(4'-甲基苯基)-1-丁酮反应合成了顺式和反式-2-氨基-3-氰基-4-苯基-1-(4'-甲基苯基)-2-环戊烯-1-醇, 并用X射线衍射分析确定了这两个异构体的构型。     

含二苯甲烷结构四元共缩聚杂萘聚芳酰胺的合成与性能

采用自制二胺1,2-二氢-2-(4-氨基苯基)-4-[4-(4-氨基苯氧基)-苯基]-二氮杂萘-1-酮、商品二胺4,4′-二氨基二苯甲烷和对苯二胺与对苯二甲酰氯进行低温溶液缩聚反应,改变三种二胺的比例,得到了一系列共聚酰胺树脂,其特性粘数为1·24~2·32dL/g,用FT-IR、1H-NMR手段研究了聚合物的结构;利用DSC和TGA研究了聚合物的耐热性能,结果表明,该类聚合物具有较高玻璃转化温度(301℃以上);氮气气氛中5%热失重温度在438℃以上;用一定比例的二胺制得的聚合物分别能溶于N-甲基吡咯烷酮、N,N-二甲基乙酰胺等非质子极性溶剂中并浇注得到韧性薄膜.     

Synthesis and characterization of novel polyarylates from 2,5-bis(4-hydroxyphenyl)-3,4-diphenylfuran and aromatic diacid chlorides

New tetraphenylated heterocyclic diol, 2,5-bis(4-hydroxyphenyl)-3,4-diphenylfuran, was synthesized by the oxidative coupling of 4-methoxydeoxybenzoin as a starting material, followed by simultaneous cyclodehydration and demethylation. Tetraphenylfuran-containing polyarylates with inherent viscosities of 0.2–0.7 dL/g were prepared from various diacid chlorides by both solution polycondensation and phase transfer catalyzed two-phase polymerization methods. All the polymers were easily soluble in dichloromethane, o-chlorophenol, 1,4-dioxane, pyridine, and N-methyl-2-pyrrolidone and showed semicrystalline patterns as evidenced by the X-ray diffraction studies. These polyarylates have glass transition temperatures in the range of 222–236°C and 10% weight loss was observed above 430°C in both air and nitrogen.     

4,4’-二氯二苯酮合成二氮杂萘联苯酮结构聚醚砜酮的研究

以4-(4-羟基苯基)*2,3-二氮杂萘-1-酮(DHPZ)、4,4’-二氯二苯砜(DCS)和4,4’-二氯二苯酮(DCK)为原料,采用分步加料的方法,合成了系列高分子量的聚芳醚砜酮共聚物(PPESKs),其特性黏度在0.40 ～0.61dL/g之间,解决了由于DCK活性低不适合用于聚芳醚合成的问题.采用FTIR、示差...     

Synthesis and characterization of novel polyamide‐imides containing noncoplanar 2,2′‐dimethyl‐4,4′‐biphenylene unit

A new diimide‐dicarboxylic acid, 2,2′‐dimethyl‐4,4′‐bis(4‐trimellitimidophenoxy)biphenyl (DBTPB), containing a noncoplanar 2,2′‐dimethyl‐4,4′‐biphenylene unit was synthesized by the condensation reaction of 2,2′‐dimethyl‐4,4′‐bis(4‐minophenoxy)biphenyl (DBAPB) with trimellitic anhydride in glacial acetic acid. A series of new polyamide‐imides were prepared by direct polycondensation of DBAPB and various aromatic diamines in N‐methyl‐2‐pyrrolidinone (NMP), using triphenyl phosphite and pyridine as condensing agents. The polymers were produced with high yield and moderate to high inherent viscosities of 0.86–1.33 dL · g⁻¹. Wide‐angle X‐ray diffractograms revealed that the polymers were amorphous. Most of the polymers exhibited good solubility and could be readily dissolved in various solvents such as NMP, N,N‐dimethylacetamide (DMAc), N,N‐dimethylformamide (DMF), dimethyl sulfoxide, pyridine, cyclohexanone, and tetrahydrofuran. These polyamide‐imides had glass‐transition temperatures between 224–302 °C and 10% weight loss temperatures in the range of 501–563 °C in nitrogen atmosphere. The tough polymer films, obtained by casting from DMAc solution, had a tensile strength range of 93–115 MPa and a tensile modulus range of 2.0–2.3 GPa. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 39: 63–70, 2001     

含芳基均三嗪环耐高温低聚酰亚胺的合成与性能

通过调控聚合单体的摩尔配比,合成了一系列新型的不同分子链长度的邻苯二甲腈封端含二氮杂萘酮联苯结构低聚酰亚胺,通过FTIR、1H-NMR、WAXD和元素分析对其结构进行表征.以4,4′-二氨基二苯砜为催化剂,低聚物经常压下固化交联后,得到含芳基均三嗪环结构的热固性聚酰亚胺.低聚物表现了良好的溶解性能,可溶于N-甲基-2-...     

Synthesis and characterization of novel polyarylates from 2,5-bis(4-hydroxyphenyl)-3,4-diphenylpyrrole and various aromatic dicarboxylic acids

A new tetraphenylated heterocylic diol, 2,5-bis(4-hydroxyphenyl)-3,4-diphenylpyrrole, was synthesized in three steps starting from 4-methoxydeoxybenzoin. The tetraphenylpyrrole-containing polyarylates having inherent viscosities of 0.28–0.88 dL/g were prepared from the diol and various aromatic dicarboxylic acid chlorides by both phase transfer catalyzed two-phase polycondensation and high temperature solution polymerization methods. All the polyarylates were semi-crystalline, and were readily soluble in a variety of solvents including N-methyl-2-pyrrolidone, m cresol, pyridine, and 1,4-dioxane. These polymers had glass transition temperatures in the range of 223–279°C, with no weight loss below 400°C in both air and nitrogen atmospheres. © 1994 John Wiley & Sons, Inc.     

含氟及硫醚基团聚酰亚胺光波导材料的合成及表征

通过分子设计,合成了含三氟甲基及硫醚基团的二胺单体4,4'-双(4-胺基-2-三氟甲基苯硫基)二苯硫醚(6FSEDA),利用其与6种芳香二酐单体:3,3',4,4'-联苯四羧酸二酐(BPDA)、4,4'-氧双邻苯二甲酸酐(ODPA)、3,3',4,4'-二苯酮四酸二酐(BTDA)、4,4'-(六氟异丙基)-苯二酸酐(6FDA)、3,3',4,4'-二苯硫醚四酸二酐(DTDA)及3,3',4,4'-二苯砜四酸二酐(DSDA)经一步法合成了一系列含氟及硫醚基团的聚酰亚胺(PI),并对其结构与性能进行了研究.结果表明,该系列PI的玻璃化温度Tg(DSC)在199.8～231.7℃范围,5%和10%热失重的温度(N2氛围)分别在491℃和517℃以上,在400～700 nm的可见光波长范围内具有优异的光学透明性,在光通讯波段(1310 nm和1550 nm处)均无明显吸收,且在这两个波长处测得的平均折射率范围分别为1.5401～1.6142和1.5389～1.6124,在波长632.8 nm测得的双折射范围为0.0012～0.0045.可见,含氟及硫醚基团聚酰亚胺薄膜具有良好的热稳定性和光学性能.     

New organosoluble polyimides with low dielectric constants derived from bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl] diphenylmethylene

A new kink diamine with trifluoromethyl group on either side, bis[4-(2-trifluoromethyl-4-aminophenoxy)phenyl]diphenylmethane (BTFAPDM) , was reacted with various aromatic dianhydrides to prepare polyimides via poly (amic acid) precursors followed by thermal or chemical imidization. Polyimides were prepared using 3,3′, 4,4′-biphenyltetracarboxylic dianhydride(1), 4,4′-oxydiphthalic anhydride(2), 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (3), 4,4′-sulfonyldiphthalic anhydride(4), and 4,4′-hexafluoroisopropylidene-diphathalic anhydride(5). The fluoro-polyimides exhibited low dielectric constants between 2.46 and 2.98, light color, and excellent high solubility. They exhibited glass transition temperatures between 227 and 253°C, and possessed a coefficient of thermal expansion (CTE) of 60-88 ppm/°C. Polymers PI-2, PI-3, PI-4, PI-5 showed excellent solubility in the organic solvents: N-methyl-2-pyrrolidinone (NMP), N,N-dimethylacetamide (DMAc), N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), pyridkie and tetrahydrofuran (THF). Inherent viscosity of the polyimides were found to range between 0.58 and 0.72 dLg-1. Thermogravimetric analysis of the polyimides revealed a high thermal stability decomposition temperature in excess of 500°C in nitrogen. Temperature at 10 % weight loss was found to be in the range 506-563°C and 498-557°C in nitrogen and air, respectively. The polyimide films had a tensile strength in the range 75-87 MPa; tensile modulus, 1.5-2.2 GPa; and elongation at break, 6-7%.     

9,9-二(4-羟基苯基)呫吨、1,4-二(4-氟苯甲酰基)苯和双酚A三元共聚物聚醚醚酮酮的合成与表征

通过亲核取代反应,将9,9-二(4-羟基苯基)呫吨(BHPX)、1,4-二(4-氟苯甲酰基)苯和双酚A(BPA)进行三元共缩聚反应,合成了几种主链含二甲基甲烷和呫吨结构的聚醚醚酮酮无规共聚物(PEEKK-X/PEEKK-A),并以FTIR、DSC、TG、WAXD等对其结构和性能进行了表征.结果表明,共聚物的玻璃化转变温度(Tg)为185～218℃,均为无定形结构,其数均分子量为39500～41600,多分散性指数为1.94～2.05.在氮气、空气气氛中,在430℃之前不分解,5%的热失重温度(Td5)分别为490～511℃、480～505℃,在氮气中700℃时的残炭率均在40%以上;在常温下易溶于非质子极性溶剂(如NMP和DMAc)以及极性较弱的溶剂(如THF和CHCl3)中.共聚物均可通过溶液浇铸成膜,所得到的薄膜韧性好,透明且耐折,其拉伸强度为58～75MPa,杨氏膜量为1.95～2.70GPa,断裂伸长率为8%～13%.当双酚单体BHPX和BPA摩尔比为60/40～50/50时,所得到的PEEKK-X/PEEKK-A共聚物更有潜在的应用前景.     

含异丙基及三氟甲基可溶性聚酰胺的合成及性能研究

以含异丙基和三氟甲基结构二胺单体3,3′-二异丙基-4,4′-二胺基苯基-4″-三氟甲基甲苯(PATFT)与萘-1,4-二甲酸、间苯二甲酸和4,4-二苯醚二甲酸3种二酸通过膦酰化反应制备一系列新型可溶性聚酰胺,其相对分子量在3.8×104~9.6×104之间.结果表明,该聚合物具有优异的溶解性能,常温不仅能溶解于N-甲基吡咯烷酮(NMP)、N,N-二甲基乙酰胺(DMAc)、N,N-二甲基甲酰胺(DMF)等高沸点有机溶剂,在加热条件下甚至能较好的溶解在四氢呋喃、氯仿、二氯甲烷等低沸点溶剂中;突出的光学性能,截止波长范围在322~350 nm,80%的透过率波长范围为378~403 nm;良好的热学性能,玻璃化转变温度(Tg)范围在213~220?C,氮气氛围下5%和10%热失重温度范围分别为453~458?C和470~482?C.聚合物薄膜具有优异的机械性能,拉伸强度、杨氏模量、断裂伸长率分别对应为68~97 MPa,1.9~2.9 GPa,14.8%~16.7%.广角X-射线图谱表明聚合物为无定形态结构.