烯丙基化合物改性双马来酰亚胺树脂的研究进展

双马来酰亚胺(BMI)树脂以其优异的机械和热稳定性能广泛用于航空航天等领域,但纯BMI熔点高、韧性和溶解性差,不能满足实际使用要求,必须对其进行改性。探讨了烯丙基化合物改性BMI的反应机理,包括"Ene"反应、Diels-Alder反应以及体系中可能存在的其他反应;并分别概述了二烯丙基双酚A(DABPA)、含硼烯丙基化合物、烯丙基酚醛树脂、烯丙基酚氧树脂及其他烯丙基化合物改性BMI体系的研究进展和改性效果。     

烯丙基酚醛改性双马来酰亚胺树脂的制备与性能

合成并表征了烯丙基酚醛树脂,再将其与双马来酰亚胺共聚制备了烯丙基酚醛改性双马树脂。通过DSC和FTIR分析了该树脂的固化行为,研究了其工艺性,利用TGA和DMA评价了其固化物的耐热性。结果表明,烯丙基酚醛树脂改性双马树脂可用于RTM等成型工艺,其固化物Tg约为330℃,初始热分解温度约400℃,5%失重温度达410℃,10%失重温度423℃。该树脂耐热性优异,可用作耐高温先进复合材料的基体树脂。     

烯丙基化合物改性双马来酰亚胺的研究

综述了近８年来烯丙基化合物改性双马来酰亚胺的研究情况。     

萘酚改性烯丙基化环保型酚醛树脂的合成及研究

分别以环保型PF(酚醛树脂)和萘酚改性环保型PF为母体,成功合成了烯丙基化PF和萘酚改性烯丙基化PF,并制备了萘酚改性烯丙基化PF/BMI(双马来酰亚胺)共聚树脂;然后分别以上述树脂作为基体树脂,制备了玻璃纤维增强型复合材料。结果表明:当基体树脂为萘酚改性烯丙基化PF/BMI共聚树脂时,相应复合材料的冲击强度(321.6 kJ/m2)和弯曲强度(524.1 MPa)比萘酚改性烯丙基化PF基复合材料提高了11.0%和46.3%,比未改性环保型烯丙基化PF基复合材料提高了42.8%和258.2%,说明萘酚改性烯丙基化PF/BMI共聚树脂的增韧效果优于萘酚改性烯丙基化PF;萘酚改性烯丙基化PF/BMI共聚树脂基复合材料的耐热性能优于未改性烯丙基化PF体系,这是因为前者800℃时的残炭率(39.62%)高于后者(10.92%)所致。     

烯丙基化合物改性双马来酰亚胺

介绍了烯丙基化合物改性双马来酰亚胺树脂(BMI)的反应机理,综述了二烯丙基双酚A、含硼烯丙基化合物、烯丙基醚、烯丙基酚氧树脂等改性BMI体系的研究进展。     

烯丙基化合物对双马来酰亚胺树脂的改性研究

为了得到综合性能更好的双马来酰亚胺(BMI)树脂,本文以二烯丙基双酚A(BA)和二烯丙基双酚S(BS)为共改性剂,对BMI树脂进行了改性,考察了共改性剂配比、固化后处理时间对改性BMI树脂体系的影响.采用动态力学分析(DMA)对改性后的BMl树脂浇铸体的热性能进行了初步分析.结果表明,BA/BS(摩尔比)为7/3的浇铸体的玻璃化转变温度(Tg)高达349.5℃,延长固化后处理时间可使浇铸体的Tg大幅提高.     

烯丙基双酚A改性双马来酰亚胺-三嗪树脂的热性能

以4,4′-二苯甲烷双马来酰亚胺、双酚A型氰酸酯和2,2-二烯丙基双酚A为基本原料制备了改性双马来酰亚胺-三嗪（BT）树脂。系统地研究了2,2-二烯丙基双酚A对BT树脂固化动力学、BT树脂的溶解性能和BT树脂固化物的热性能的影响。研究结果表明：烯丙基双酚A有效地降低了BT树脂的固化反应温度并提高了BT树脂的溶解性能。当烯丙基双酚A的加入量为20%（质量分数）时,BT树脂的固化反应峰值降至233.1 ℃;并且,其固化物的玻璃化转变温度仍然达到239.4 ℃,5%热失重温度为372.9 ℃,显示了良好的耐热性能。     

烯丙基酚醛-双马来酰亚胺树脂胶粘剂的制备及性能研究

采用烯丙基氯与热塑性酚醛树脂反应,制备出烯丙基酚醛树脂,然后加入双马来酰亚胺树脂与烯丙基酚醛树脂共聚制备出烯丙基酚醛-双马来酰亚胺树脂。对改性树脂的结构,固化反应和热失重情况进行了研究,通过加入增韧剂制备出耐高温胶粘剂,研究了增韧剂用量对室温和高温粘接强度的影响,结果表明,胶粘剂室温拉伸剪切强度为21.6MPa,300℃拉伸剪切强度为10.1MPa。     

烯丙基酚氧树脂/双马来酰亚胺改性树脂的制备及表征

用环氧树脂和二烯丙基双酚A(DP)合成了3种新型烯丙基酚氧树脂,测试了该树脂改性双马来酰亚胺(BMI)树脂体系的力学性能和热性能及黏度特性,探讨了后处理对改性树脂性能的影响。结果表明,改性树脂具有良好的2韧性和耐热性,冲击强度达到了22.31kJ/m,HDT仍有224℃,后处理使得体系耐热性大大提高,韧性略有降低。     

烯丙基酚氧树脂改性双马来酰亚胺体系的优化

通过环氧树脂与二烯丙基双酚A合成了一种烯丙基酚氧树脂,用以增韧双马来酰亚胺。在单因素试验的基础上,根据Box-Benhnken的中心组合试验设计原理,选取改性树脂体系组分为影响因子,应用响应面法进行3因素3水平的18组的设计试验,改性树脂性能(弯曲强度,冲击强度,热变形温度)为响应值,对改性树脂组分配比进行优化。结果表明,改性树脂组分配比BMI、DDS、APO、DABPA、DAP为2∶1∶0.2∶0.84∶0.1(物质的量比)时,综合2性能最好,此时改性双马树脂体系的冲击强度可达到21.4 k J/m,弯曲强度为200.5 MPa,热变形温度为195.8℃。     

Thermosetting resin system based on novolak and bismaleimide for resin‐transfer molding

A thermosetting resin system for resin‐transfer molding based on novolak and bismaleimide (BMI) was developed. The novolak resin was allylated and BMI was used as the curing agent, and allyl phenyl ether, as the diluent. The viscosity–temperature curve and the viscosity–time curve were used to characterize the processing property of the resin system. The resin system had a long pot life at the injection temperature. Based on the DSC data, a regime for the curing and postcuring cycles was established. The cured resin showed outstanding heat resistance and good flexural properties. Composites based on the resin system and woven glass fabric were fabricated using RTM technology. The composites showed very good flexural properties at room temperature and high retention rates at 200 and 300°C. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 1651–1657, 2002     

硼酸烯丙基苯酯改性BMI的研究

本文研究了硼酸烯丙苯酯改性双马来酰亚胺树脂体系的物理性能，反应性和固化树脂的力学性能，耐热性，耐烧蚀性以及复合材料的性能等。     

SBR好氧污泥颗粒的脱氮性能研究

The sequencing batch reactor （SBR） was started up by seeding the anaerobic granular sludge and the aerobic granular sludge was successfully cultivated. The performance characteristic of the aerobic granules for nitrogen removal was investigated in detail. The experimental results demonstrated the relationship between operational parameters [dissolved oxygen （DO） and pH] and variation of chemical oxygen demand （COD）, ammonium （NH4^＋-N） and total nitrogen （TN）. In continuous flow pattern, COD was too low in the reactor at the later stage of a cycle, which restrained denitrification and decreased the removal of nitrogen, while in discontinuous flow pattern, the carbon source could be supplemented in time, which improved denitrification and increased the removal of TN from 66% to 81%.     

烯丙基酚醛树脂的合成与固化特性研究

合成了烯丙基线性酚醛树脂,研究了在加热和加热/催化剂条件下的固化特性,采用烯丙基化线性酚醛树脂与双马来酰亚胺反应形成共聚物,通过FTIR和DSC分别分析了树脂在无催化剂和磷酸三苯酯(TPP)催化条件下的固化和结构,研究结果表明:烯丙基化酚醛树脂,双马来酰亚胺改性烯丙基化酚醛树脂在加热条件下不需要固化剂可以实现加成固化。     

低温固化烯丙基酚氧树脂／双马来酰亚胺树脂的研究

为降低双马来酰亚胺树脂的固化温度,用2-甲基咪唑（2-MI）为烯丙基酚氧树脂／双马来酰亚胺树脂体系的固化催化剂,测试了改性树脂体系的凝胶化时间、力学性能和热性能,并探讨了催化剂含量对树脂性能的影响。结果表明,当催化剂质量分数为05％时,体系性能最佳。冲击强度为26．39kJ／m2,弯曲强度为14485MPa,热变形温度为202℃,树脂具有良好的韧性,并保持了优异的耐热性。     

Novel modified bismaleimide resins with improved ablativity

To improve the ablativity of bismaleimide-type resins, a series of novel allyl compounds containing boron in their molecular structure, designated as ACB, were synthesized and characterized. The copolymers made up of 4,4′-bismaleimidodiphenyl methane (BDM) and each ACB were prepared. The properties of the prepolymers and cured resins were all studied in detail. Results show that the prepolymers of BDM/ACB systems have similar processing characteristics such as solubility in acetone and reactivity to those of ordinary BMI resins made up of BDM and allyl compounds without boron, such as the famous BDM/BA (O,O′-diallylbisphenol A) system, while the thermal resistance and ablativity of the former are better than those of the latter. Thermogravimetric analysis (TGA) in a nitrogen atmosphere revealed that the BDM/ACB systems were stable up to 480°C and their char yields at 800°C under anaerobic conditions were more than 50%. However, the char yield at 700°C of the BDM/BA system is only about 21%. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 1623–1631, 1999     

新型烯丙基化合物改性双马来酰亚胺树脂的制备及研究

利用环氧树脂和二烯丙基双酚A (DP)合成了一种新型烯丙基化合物(改性剂A),然后用该化合物改性双马来酰亚胺树脂(BMI),通过差示扫描量热法研究了BMI/DP/改性剂A体系的固化反应动力学,确定了固化工艺参数,并测试了该体系的力学性能、热性能和溶解性能。结果表明,该体系固化反应的表观活化能为88.512 kJ/mol,反应级数为0.91,为非整数,表明固化反应机理较为复杂;该体系较佳的固化工艺为150℃/1 h+170℃/2 h+200℃/2 h;相对于DP,改性剂A对BMI的增韧效果更为优异,当改性剂A用量为70份时,BMI/DP/改性剂A体系的力学性能最好,其冲击强度为23.31 kJ/m2,弯曲强度为155.8 MPa,热变形温度为224℃,质量损失5%时的温度为389.4℃,可溶于丙酮,具有良好的韧性、热性能和溶解性能。     

基于改进多模型FDA的间歇生产过程的故障诊断

1 INTRODUCTION In recent decades, batch processes have been a wide concern in the chemical fields because of their low-volume, high-value products and capabilities of easily tracking changing market situations. Therefore, it is necessary to monitor them in order to ensure safe, decrease the production costs and enhance the quality of products. Batch processes are characterized by the precise sequencing and automation of all stages in the sequence. They convert raw materials into products …