甲基丙烯酸甲酯-N-环己基马来酰亚胺二元共聚物的研究

研究了本体法甲基丙烯酸甲酯-N-环己基马来酰亚胺二元共聚体系的组成对共聚物的光学性能、热性能及力学性能的影响。实验结果表明，当-N-环己基马来酰亚胺用量为甲基丙烯酸甲酯量的2．5％时，共聚物的玻璃化转变温度比纯聚甲基丙烯酸甲酯提高了12．3℃；热分解温度提高了41．1℃；硬度及透明性也均有所提高。     

Maleimide–based donor-π-acceptor-π-donor derivative for efficient organic light-emitting diodes

Herein, we report a highly fluorescent material 3,4-bis(4′-(9H-carbazol-9-yl)-[1,1′-biphenyl]-4-yl)-1-hexyl-1H-pyrrole-2,5-dione (Cbz-MI) based on donor-π-acceptor-π-donor (D-π-A-π-D) backbone. We explored maleimide as an acceptor, phenyl as π-conjugated spacer and carbazole as donor. Photophysical properties revealed high photoluminescence quantum yield of 0.84 and 0.72 in solution and doped matrix, respectively. An encouraging external quantum efficiency of 2.5% with emission peak at 550 nm is achieved utilizing Cbz-MI as emitting layer in doped electroluminescent device structure.     

几种N-取代苯基马来酰亚胺单体的合成与表征

以马来酸酐、苯胺及其衍生物为主要原料合成了N-对甲苯基马来酰亚胺(NM PM I)、N-对氯苯基马来酰亚胺(NCLPM I)、N-对甲氧苯基马来酰亚胺(NM OPM I),产率可达85%以上。采用1H-NM R,13C-NM R和FT-IR等仪器对产物及中间产物马来酰胺酸的结构进行详细的表征。研究发现马来酰胺酸和马来酰亚胺苯环上不同的取代基,在1H-NM R谱图中,对HC=CH上质子峰的影响不大,而对苯环上质子峰却有影响,吸(供)电子基使苯环质子的化学位移向低(高)场移动;在13C-NM R谱图中,含强电负性(O、N、C l)的取代基使苯环上δc1低场移动,邻对位δc略向高场移动,取代基的电负性越大,位移也越大。     

Synthesis and polymerization of maleimide-type new macromonomer with polystyrene having controlled chain length

A new reactive and functionalized polystyrene with a maleimide moiety at the one polymer end was synthesized with N-(4-(1-chloroethyl)pheyl)maleimide (CEPMI)/SnCl₄/tetra-butylammonium chloride (TBAC) initiating system. The polymer obtained with the CEPMI/SnCl₄/TBAC initiating system under the condition of [TBAC]/[SnCl₄] = 1 was to be maleimide-type macromonomer with polystyrene having controlled molecular weight of polystyrene (VI). VI could be polymerized with anionic and radical initiators to give new type graft polymer (poly[N-(4-ethylphenyl)maleimide]-graft-polystyrene) with controlled chain length with respect to side chains.     

PE—g—MI增容PET／PE共混体系的研究

介绍用溶液法合成ＰＥ－ｇ－马来酰亚胺（ＭＩ），并研究它作为相容剂对ＰＥＴ／ＰＥ共混物热、力学性能和形态结构的影响。结果表明，在ＰＥＴ／ＰＥ共混体系中，加入少量ＰＥ－ｇ－ＭＩ，可较好地改善ＰＥＴ与ＰＥ之间的相容性，增加两相间的界面粘接力，同时对ＰＥＴ的结晶有较强的促进作用，使其冷结晶温度降低，并且即使在共混物的淬火过程中，ＰＥ－ｇ－ＭＩ也能很好地诱导ＰＥＴ结晶。     

Synthesis and characterization of maleimide and norbornene functionalized benzoxazines

Two types of monofunctional benzoxazines with imide functionalities have been synthesized for improved thermal properties. These materials achieve char yields above 55% and exhibit glass transition temperatures above 250 °C. The new benzoxazines have maleimide and norbornene functionalities that can further polymerize with mechanisms different from benzoxazine. The multiple polymerization mechanisms of the maleimide based benzoxazine monomer with different free radical initiators are monitored by Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC). The extent and type of polymerization, which affect the final network structure of the benzoxazine polymer, are characterized.     

Maleimide-epoxy resins: preparation, thermal properties, and flame retardance

Maleimide modified epoxy compounds were prepared through reacting N-(4-hydroxylphenyl)maleimide (HPM) with diglycidylether of bisphenol-A. Triphenylphosphine and methylethylketone were utilized in the reactions as a catalyst and a solvent, respectively. The resulting compounds possessed both oxirane ring and maleimide group. The kinetics of the curing reactions of the maleimide-epoxy compounds and amine curing agents, 4,4-diaminodipheylmethane (DDM) and dicyandiamide (DICY), were studied. Incorporation of maleimide groups into epoxy resins provided cyclic imide structure and high cross-linking density to the cured resins, to bring high glass transition temperatures (179 °C) and good thermal stability (above 380 °C) to the cured resins. High char yields in the thermogravimetric analysis and high limited oxygen index values (25.5-29.5) were also observed for the cured resins to impy their good flame retardance.     

Novel thermosetting resins based on 4-(N-maleimidophenyl)glycidylether I. Preparation and characterization of monomer and cured resins

A hybrid monomer of 4-(N-maleimidophenyl)glycidylether (MPGE), which possesses both oxirane ring and maleimide curable groups, was first synthesized from N-(4-hydroxyphenyl)maleimide and epichlorohydrin by using benzyltrimethylammonium chloride as a catalyst. MPGE was then cured with amine compounds (DDM and DICY) and diethylphosphite (DEP) to result in crosslinking networks. The curing kinetics and mechanisms were studied. High glass transition temperature, good thermal stability, and attractive flame retardance were observed for the prepared resins. These thermal and flame retardant properties of the cured resins were further enhanced by using DEP as the curing agent, which incorporated phosphorus into the cured resins.     

High molecular weight copolymers of vinylferrocene and 3-phenyl[5]ferrocenophane-1,5-dimethylene with various N-substituted maleimides

Two series of ferrocene-containing polymers have been synthesized from various N-substituted maleimides with 3-phenyl[5]ferrocenophane-1,5-dimethylene (3A–C) or vinylferrocene (4A–C). These copolymers exhibit high molecular weights and 4A–C formed free standing films. Electrochemical studies with copolymers 3A–C and 4A–C in dimethylacetamide show chemical reversibility for all of the materials but only copolymers 4A–C show electrochemical reversibility. These copolymers were also electrochemically deposited from methylene chloride onto a platinum electrode to form chemically modified electrodes (CMEs). The CMEs show desorption of the ferrocene polymers in acetonitrile solutions but exhibited good stability in aqueous solution. The thermal stabilities of the copolymers 4A–C are typical for a ferrocene containing polymer with 10% weight loss occurring at ca. 385 °C. Copolymers 3A–C exhibit higher thermal stabilities with 10% weight loss at 438 °C. Differential scanning calorimetry measurements of the copolymers showed melt transitions just before the onset of thermal decomposition.     

制备条件对ABS/St-MAH-NPMI二元合金性能的影响

制备了ABS／St—MAH—NPMI二元合金，研究了制备条件对材料性能，尤其是热性能的影响；着重分析了加工温度在耐热改性中的关键作用。实验说明，添加25％的St—MAH—NPMI共聚物（SMN）可以使ABS的热变形温度从70℃提高到约86℃，同时材料的刚性增加，冲击性能略有下降。实验表明，制备流动性、耐热性优良的合金需要大于250℃的加工温度，是为了SMN树脂能充分熔融，与ABS树脂中苯乙烯-丙烯腈共聚物连续相能够良好混合。高温和强剪切条件下橡胶相的氧化分解以及连续相（苯乙烯-丙烯腈共聚物）摩尔质量下降是影响材料冲击性能的重要原因。