2,5-二辛氧基聚对苯的合成及表征

蓝色电致发光;2;5-二辛氧基聚对苯的合成及表征     

聚(2-甲氧基-5-壬氧基)对苯乙炔的合成及其电致发光性质

以对甲氧基苯酚和溴代正壬烷为原料,通过醚化、氯甲基化和脱氯化氢反应得到可溶性的聚（２－甲氧基－５－壬氧基）对苯乙炔,以其为发光层装配了聚合物单层电致发光器件,研究了它的电致发光和光致发光性质;电致发光器件具有良好的稳定性,其起亮电压为７Ｖ。聚合物的结构由ＩＲ、＾１Ｈ－ＮＭＲ及ＵＶ／Ｖｉｓ光谱得到确认。     

Intercalated Poly (2-acrylamido-2-methyl-1-propanesulfonic Acid) into Sulfonated Poly (1,4-phenylene ether-ether-sulfone) Based Proton Exchange Membrane: Improved Ionic Conductivity

A series of hybrid proton exchange membranes were synthesized via in situ polymerization of poly (2-acrylamido-2-methyl-1-propanesulfonic acid) PMPS with sulfonated poly (1,4-phenylene ether-ether-sulfone) (SPEES). The insertion of poly (2-acrylamido-2-methyl-1-propanesulfonic acid) PMPS, between the rigid skeleton of SPEES plays a reinforcing role to enhance the ionic conductivity. The synthesized polymer was chemically characterized by fourier-transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance ¹H NMR spectroscopy to demonstrate the successful grafting of PMPS with the pendent polymer chain of SPEES. A variety of physicochemical properties were also investigated such as ion exchange capacity (IEC), proton conductivity, water uptake and swelling ratio to characterize the suitability of the formed polymer for various electrochemical applications. SP-PMPS-03, having the highest concentration of all PMPS, shows excellent proton conductivity of 0.089 S cm⁻¹ at 80 °C which is much higher than SPEES which is ~0.049 S cm⁻¹. Optimum water uptake and swelling ratio with high conductivity is mainly attributed to a less ordered arrangement polymer chain with high density of the functional group to facilitate ionic transport. The residual weight was 93.35, 92.44 and 89.56%, for SP-PMPS-01, 02 and 03, respectively, in tests with Fenton’s reagent after 24 h. In support of all above properties a good chemical and thermal stability was also achieved by SP-PMPS-03, owing to the durability for electrochemical application.     

聚对苯基苯酚取代磷腈的合成与表征

环状三聚六氯化磷腈在α-氯代萘中开环聚合得到聚氯化磷腈.后者与对苯基苯酚钠反应合成了标题聚合物.测定了该聚合物的IR、~1H NMR谱.GPC估计其数均分子量为6×10~4.扭辫分析表明,该聚合物的玻璃化转变温度与粘流温度分别为0℃和130℃,硫化温度为210℃.     

聚环氧氯丙烷的合成与表征

环氧丙烷-三氯化铁、环氧氯丙烷-二乙基氯化铝和铝卟啉-环氧氯丙烷体系是合成分子量为10~4数量级晶态和10~5数量级非晶态聚环氧氯丙烷的比较理想的体系。利用合成产物的分级试样确定了非晶态聚环氧氯丙烷的Mark-Houwink方程。     

可溶性聚对二乙炔苯的合成与表征

一些π-共轭高聚物由于具有优良的荧光性能或三阶非线性光学性能而引起了人们极大的兴趣,合成新型可溶性π-共轭高聚物的研究已成为近年来的研究热点.对二乙炔苯的聚合研究已有报道.     

含环氧端基酚酞聚芳醚腈的合成及表征

环氧树脂（ＥＲ）的冲击韧性和耐开裂性较差,因此,提高其抗冲强度而不显著影响力学性能和耐热性能是重要的研究课题．对于ＥＲ的增韧,以前主要采用液态橡胶．近年来,人们开始研究使用高性能热塑性树脂增韧ＥＲ［１～３］．聚醚腈（ＰＣＥ）是目前机械强度最高的热塑性...     

Flammability and thermal behaviour of phosphorus-containing polyamides. Copolymers of poly(1,4-phenylene terephthalamide), poly(1,3-phenylene isophthalamide), poly(1,4-phenylene sebacylamide) and poly(1,3-phenylene sebacylamide)

Some flame retardant copolyamides derived from 1,4-phenylenediamine or 1,3-phenylenediamine and N,N′-bis[(dialkoxyphosphinyl)methyl]1,4-benzenediamine with terephthaloyl or isophthaloyl, or sebacoyl dichlorides, are reported. Thermal and thermo-oxidative stability were studied by means of TGA. The influence of chemical structure in enhancing thermo-oxidative resistance of copolyamides was established. In the case of sebacylamides the DSC thermograms were also obtained. The flammabilities of the copolymers were determined by means of the limiting oxygen index; in the case of sebacylamides, the limiting nitrous oxide index was also determined. Comparison of LN₂OI with the LOI in sebacylamides reveals that the action of the flame retardant groups affects mainly the condensed phase decomposition. This view is also supported from the new stage of decomposition revealed in the DTGA thermograms.     

Synthesis and Characterization of Poly(Diallyldimethylammonium Chloride-g-Acrylamide)

Graft copolymers of poly(diallyldimethylammonium chloride), (poly-DADMAC), with acrylamide were synthesized using a ceric salt/nitric acid initiation system. The effects of concentration of initiator, monomer, and substrates were studied. Copolymers were characterized by viscometry and size-exclusion chromatography. The highest molecular weight ( M _w ) of graft copolymer obtained was 1.70 × 10⁶. The compositions of copolymers are dependent upon the ratios of the concentration of monomer to the concentration of substrate. The highest content of DADMAC monomer unit in the copolymer was 33 wt%.     

聚(乙烯基四唑-co-丙烯酸)的合成与表征

以聚丙烯腈为原料,首先通过部分腈基的[3+2]合环反应转化为聚(乙烯基四唑-co-丙烯腈)[Poly(VT-co-AN)],再通过碱性水解反应将剩余的腈基转化为羧基,合成出聚(乙烯基四唑-co-丙烯酸)[Poly(VT-co-AA)]。 采用傅里叶红外变换光谱仪(FT-IR)、核磁共振碳谱仪(¹³C NMR)、酸碱滴定等方法对Poly(VT-co-AN)和[Poly(VT-co-AA)的结构进行了表征,结果表明,Poly(VT-co-AN)的分子链中含有腈基、四唑基团和部分羧基,四唑基团的含量为68.6%,与酸碱滴定法测定的四唑基团的含量相近,[Poly(VT-co-AA)中含有四唑基团和羧基,不含有腈基,酸值高于Poly(VT-co-AN),四唑基团的含量为67.6%,与叠氮化钠与聚丙烯腈的摩尔比相近。 热失重分析结果显示[Poly(VT-co-AA)的热分解速率加快,在270~285 ℃的温度区间内分解完全。     

Synthesis and antimicrobial activity of 1,3-/1,4-phenylene linked bis(azoles)

A new class of 1,3- and 1,4-phenylene linked bis(azoles) were prepared from E-cinnamohydrazide, isophthalic/terephthalic acids adopting ultrasonication methodology and tested for antimicrobial activity. Amongst all the tested compounds 7c, 9a, and 9c are potential antimicrobial agents against S. aureus and P. chrysogenum.     

Synthesis and Characterization of Poly(ether-block-amide) Membranes

Poly(ether-block-amide) membranes were made via casting a solution on a nonsolvent (water) surface. In this research, effects of different parameters such as ratio of solvent mixture (n-butanol/isopropanol), temperature, composition of coagulation bath (water) and polymer concentration, on quality of the thin film membranes were studied. The mechanism of membrane formation involves solution spreading, solvent–nonsolvent exchange, and partial evaporation of the solvent steps. Solvent- nonsolvent exchange is the main step in membrane formation and determines membrane morphology. However, at higher temperature of polymeric solution greater portion of solvent evaporates. The results showed that type of demixing process (mutual affinity between solvent and nonsolvent) has important role in film formation. Also, addition of solvent to the nonsolvent bath is effective on membrane morphology. The film quality enhances with increasing isopropanol ratio in the solvent mixture. This behavior can be related to increasing of solution surface tension, reduction of interfacial tension between solution and nonsolvent and delayed solvent-nonsolvent demixing. Uniform films were made at a temperature rang of 60–80 °C and a polymer concentration of 4–7 wt%. Morphology of the membranes was investigated with scanning electron micrograph (SEM). Pervaporation of ethyl butyrate/water mixtures was studied using these membranes and high separation performance was achieved. For ethyl butyrate/water mixtures, It was observed that both permeation flux and separation factor increase with increasing ethyl butyrate content in the feed. Increasing temperature in limited range studied resulted in decreasing separation factor and increasing permeation flux.     

新型聚原酸酯共聚物的合成及性能研究

以二聚甘油为原料,经过酯交换及氨基脱保护反应合成了一种两端含氨基的环状原酸酯新单体。该单体与辛二酸/十二烷二酸活性酯缩聚得到两种新的疏水性聚原酸酯共聚物POEAd-1和POEAd-2,其数均分子量分别由凝胶渗透色谱(GPC)测得为1.24×104及1.81×104,分散度(PDI)分别为1.59及1.93。热失重分析法证实POEAd-1和POEAd-2具有较高的热稳定性能,其起始降解温度分别可达198.5℃及202.5℃。溶血试验和MTT细胞毒性试验表明,POEAd-1和POEAd-2均具有良好生物相容性,作为一种潜在的生物医用材料,在药物缓控释领域将具有广阔的应用前景。     

聚四氢呋喃三元醇的合成及表征

合成了一种新的三元引发剂[C₂H₅C(CH₂OCH₂CH₂CO+ClO₄^-)₃],并用于制备聚四氢呋喃三元醇.用¹HNMR,FTIR和GPC法对聚合物的结构进行了表征.结果表明,产物中环状齐聚物的含量极低.对聚合物水解产物的分子量及分子量分布测定结果表明,产物为预期的三元醇,聚合反应过程中链转移可以忽略,聚合物的分子量可控.     

Unperturbed dimensions of poly(2-methyl-6-phenyl-1,4-phenylene oxide) and poly(2,6-diphenyl-1,4-phenylene oxide) chains

The unperturbed chain dimensions of unfractionated poly(2-methyl-6-phenyl-1,4-phenylene oxide) and poly-(2,6-diphenyl-1,4-phenylene oxide) have been measured by combining molecular weight data from light scattering with intrinsic viscosity data in chloroform. The unperturbed chain dimensions of the former polymer were also measured directly by light scattering dissymmetry in a critical consolute solvent mixture (methyl cyclohexane: 1,4-dioxane 50:50 by volume). The results of these measurements and of measurements reported by other investigators are satisfactorily explained by postulating no dimension-expanding prejudice in azimuthal angle in chain conformers of the 2,6-substituted-1,4-phenylene oxide polymers. This corresponds to equal population of the two chain rotation energy minima at azimuthal angles 90° and 270°. Accepting this postulate, one calculates from the observed chain dimensions that the C? O? C bond angle is 118–120° in these aromatic polyethers in solution.     

Synthesis of Poly(1,3-cyclohexadiene) Containing Star-Shaped Elastomers

The synthesis of high molecular weight star-shaped polymers comprising poly(1,3-cyclohexadiene-block-isoprene) diblock arms coupled to a divinyl benzene (DVB) core is reported. The number average molecular weights of the diblock arms were varied from 30000 to 50000 and the ratio of DVB to n-butyllithium (nBuLi) was systematically varied from 3:1 to 12:1. Size exclusion chromatography coupled with light scattering detection was utilized to detect the formation of star-shaped polymers and the presence of star-star coupling. The molecular weight distribution (<M_w>/<M_n>) of the star polymers ranged from 1.25 to 1.50. The effect of poly(1,3-cyclohexadiene) content on the mechanical properties of these novel elastomers is reported. The elastic modulus, elongation at break, and tensile strength of these elastomers were all found to be a function of the percentage of poly(1,3-cyclohexadiene). The glass transition temperatures were determined using both differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). Atomic force microscopy was performed in the tapping mode (TMAFM) to verify the presence of microphase separation.     

Synthesis of 2-methyl-1,3-cyclopentanedione monoethylene ketal

Direct ketalization of 2-methyl-1,3-cyclopentanedione 3 led to the corresponding diethylene ketal 2. Carefully controlled hydrolysis of compound 2 afforded the monoethylene ketal 1 in high yield.     

N-异丙基丙烯酰胺/N-乙烯基吡咯烷酮水凝胶的研究

研究了用Ｎ,Ｎ－亚甲基双丙烯酰胺作交联剂,Ｎ－异丙基丙烯酰胺／Ｎ－乙烯基吡咯烷酮共聚物水凝胶的合成与性能。结果表明,ＮＶＰ能显著延长共聚体系的凝胶化时间,但对共聚物的体积相变温度影响并不十分显著。当Ｎ－乙烯基吡咯烷酮的配料摩尔比（Ｎ－乙烯基吡咯烷酮／Ｎ－异丙基丙烯酰胺＋Ｎ－乙烯基吡咯烷酮）＝０．０１时,水凝胶呈现最大Ｔｃ和平衡溶胀胀比。当温度低于Ｔｃ时共的在水中的平衡溶胀比与Ｎ－异丙基丙烯酰胺和Ｎ－乙烯基吡咯烷酮的配料比有关;Ｎ－乙烯基吡咯烷酮配料摩匀比〈０．０１,平衡溶胀比随Ｎ－乙烯基吡咯烷酮配料摩尔比的增加而增加;Ｎ－乙烯基吡咯烷桐配料摩尔比〉０．０１,平衡溶胀比随Ｎ－乙烯基吡咯烷酮配料摩尔浓度的增加而降低。同Ｎ－并异丙烯酰胺均聚物水凝胶相比,共聚物水凝胶具有较好的温敏响应性。ＤＳＣ和ＴＧＡ研究表明,Ｎ－乙     

Synthesis of regiocontrolled poly(4,6-di-n-butoxy-1,3-phenylene) by oxidative coupling polymerization

Poly(4,6-di-n-butoxy-1,3-phenylene) ( 6 ) was prepared by oxidative coupling polymerization of 1,3-di-n-butoxybenzene ( 1 ) or 2,2′,4,4′-tetra-n-butoxy biphenyl (3). Polymerizations were conducted in nitrobenzene in the presence of FeCl₃ at room temperature and produced polymers with number-average molecular weights up to 42,000. The effects of various factors, such as amount of FeCl₃ and reaction temperature and time were studied. The structure of polymer 6 was characterized by 270 MHz ¹H- and 68.5 MHz ¹³C-NMR spectroscopies and was estimated to consist of almost completely 1,3-linkage. The regiocontrolled polymer was readily soluble in common organic solvents. Thermogravimetric analysis of polymer 6 showed 10% weight loss at 390°C in nitrogen. © 1997 John Wiley & Sons, Inc. J Polym Chem 35 : 2259–2266, 1997