聚氨酯/聚(甲基丙烯酸甲酯-苯乙烯)半互穿网络形成的研究

为了解semi_IPN(半互穿聚合物网络 )热塑性弹性体网络形成过程的化学反应原理 ,利用恒温DSC法研究了PU/PMS(聚氨酯/聚甲基丙烯酸甲酯 -苯乙烯 ) -半互穿聚合物网络热塑性弹性体的网络形成过程的反应动力学 ,结果表明PU/PMS_semi_IPN中两组分的反应并不同步 ,PU组分的反应快于PMS组分的聚合 ,体系组分比和反应温度的变化对网络的形成有明显的影响。通过对形成过程透光率的研究,发现该体系的早期相分离主要由组分比和聚氨酯组分的聚合速率决定 ,聚(甲基丙烯酸甲酯 -苯乙烯 )组分通过在PU网络聚合中起“稀释剂”的作用来影响相分离的过程。     

乙烯基酯树脂的研究进展

在19篇文献的基础上综述了乙烯基酯树脂的种类、合成方法及各种乙烯基酯树脂的性能和用途；对用热塑性树脂改性乙烯基酯树脂、橡胶改性乙烯基酯树脂、双马来酰亚胺改性乙烯基酯等最新研究进展进行了讨论；对乙烯基酯树脂的两种固化方式的固化机理和固化影响因素进行了分析。     

有机硅改性聚氨酯齐聚物增韧环氧树脂的研究

为获得高韧性环氧树脂,合成了异氰酸酯封端的聚氨酯预聚体,用两端含羟乙基的直链有机硅（PDMS）和二羟甲基丙酸（DMPA）进行扩链改性,得到羟基封端的有机硅改性的含羧基的聚氨酯齐聚物,用此齐聚物作为增韧剂去接枝改性环氧树脂,然后用甲基四氢苯酐进行固化,得到了聚氨酯（PU）／环氧树脂（EP）互穿聚合物网络。用红外光谱和扫描电镜研究了互穿聚合物网络形成的动力学和微相分离行为;用动态力学分析和摆锤冲击实验等考察了不同配比下IPN的力学性能;用热失重分析研究了材料的耐热性。结果表明：PU／EP在一定的配比范围内可以得到冲击强度、模量及耐热性同时得到提高的复合材料。     

聚氨酯/聚(甲基丙烯酸甲酯-苯乙烯)-半互穿网络热塑性弹性体的结构与性能研究

通过TEM和DSC等手段分析了聚氨酯／聚(甲基丙烯酸甲酯-苯乙烯)-半互穿网络(IPN)热塑性弹性体PU／P(MMA-co-St)的微观结构和玻璃化转变温度。结果表明中PU仍为分散相或连续性较小的相,而P(MMA-co-St)则为连续相或较大连续相,网络的互穿主要发生在PU的硬段区。对材料物理机械性能的测试表明当PU／PMS组分比为60／40、单体比MMA／St为50／50左右时,制得的半IPN的力学性能最佳。     

SiO_2填充型聚氨酯IPN绝缘冷浇注树脂的研究

冷浇注型绝缘树脂是通讯电缆、电力电缆附件的重要组成材料之一。由三羟甲基丙烷（TMP）、蓖麻油（CO）、活性烯类单体等构成树脂基林，填充SIO_2等无机填料，固化后形成绝缘聚合物互穿网络（TMP－FUIPN）。将这种材料按双组份配制可以长期贮存，混合后可在室温下浇注，并可在12—24h内完全固化。口化后的材料只有良好的电绝缘性能和物理机械性能可作为冷浇注型电缆附件材料使用。     

半互穿聚合物电解质的制备及电化学性能研究

采用原位聚合工艺制备半互穿聚合物电解质,并通过交流阻抗、线性扫描伏安法、计时电流等方法对半互穿聚合物电解质的离子电导率、电化学窗口及锂离子迁移数等电性能进行分析表征.研究结果表明,半互穿聚合物电解质能够自发成膜,其电化学稳定电压大于4.3 V,采用原位涂覆固化方法制备的半互穿聚合物固态电池循环80次,容量保持率为82％...     

PVA-PAAS基碱性聚合物电解质的制备及性能

采用溶液浇铸法制备了聚乙烯醇(PVA)-聚丙烯酸钠(PAAS)-KOH-H2O碱性聚合物电解质膜.膜的电导率与KOH和H2O含量密切相关,PAAS可明显改善PVA基碱性聚合物电解质膜的保水性能和机械性能,PAAS和KOH可使聚合物的结晶度和熔点降低.在20～50℃范围内,电解质膜的电导率与温度的关系符合Arrhenius方程.组成为PVA(以下均为质量分数)(13.84%)-PAAS(0.73%)-KOH(36.43%)-H2O(49%)电解质膜的室温电导率高达9.67×10-2S/cm,在不锈钢惰性电极上的电化学稳定电位范围约为1.6 V,可应用于活性炭超级电容器.     

双马来酰亚胺三嗪树脂改性研究进展

综述了双马来酰亚胺三嗪树脂(BT树脂)改性技术的研究现状和最新研究进展,包括:结构改性-可交联活性基团的引入、互穿聚合物网络技术引入其它改性树脂、共聚改性和共混改性.论述了经二烯丙基双酚A、环氧树脂、聚苯醚等改性后的BT树脂,其介电性能、耐高温性、加工工艺性及其对玻璃纤维的浸润性等性能的变化.介绍了BT树脂改性发展方向及其在高性能印制电路板(PCB)应用中存在和急需解决的问题.     

“聚合物合成工艺学”网络课程的建设与成效

"聚合物合成工艺学"网络课程以毕博公司开发的Blackboard系统软件为教学平台,结合课程性质及教学特点进行构建。所设计制作的形象、直观、逼真的单元合成设备图、工艺流程图、Flash动画、视频、可视化化学结构式动态图片等构件在教学实践中起到了常规教学手段难以达到的教学效果。所设计的学习交流栏目被实践证明是学生最热衷参与、点击率最高的栏目,它可以实现师生之间的在线交流,营造学习氛围,促进学生对知识的深入理解和运用。     

“聚合物合成工艺学”网络课程的建设与成效

“聚合物合成工艺学”网络课程以毕博公司开发的Blackboard系统软件为教学平台,结合课程性质及教学特点进行构建。所设计制作的形象、直观、逼真的单元合成设备图、工艺流程图、Flash动画、视频、可视化化学结构式动态图片等构件在教学实践中起到了常规教学手段难以达到的教学效果。所设计的学习交流栏目被实践证明是学生最热衷参与、点击率最高的栏目,它可以实现师生之间的在线交流,营造学习氛围,促进学生对知识的深入理解和运用。     

Preparation and properties of SiO2 aerogel and fabric composite based on polyurethane

ABSTRACT

The thermal insulation composite were prepared by blending aqueous polyurethane and modified SiO₂ aerogel, and then coating to the surface of fabric. The influence of the content of SiO₂ aerogel and polyurethane, crosslinking temperature and the particle size of SiO₂ aerogel on thermal insulation rate of the composite fabric were detail analysis, the heat insulation, breathable, IR, SEM surface morphology of the composite fabric were evaluated. The thermal insulation rate of the SiO₂ aerogel composite fabric is 28.97%, which is twice that of the original fabric. SiO₂ aerogel composite fabric will have a wide range of application in the thermal insulation clothing, curtains, shoe materials, industrial equipment and building insulation, etc.     

聚氨酯防水保温材料对混凝土抗冻性能的影响

混凝土抗冻性作为其耐久性的重要指标之一,被工程界广泛关注.其冻融破坏主要是由于混凝土材料与水接触时在正负交替温度作用下发生剥蚀.我国北方寒冷地区诸多水利工程遭受冻融破坏,对工程安全运行产生不利影响.聚氨酯材料具有防水保温性能,能够将内部的混凝土试件与外界隔离开,降低了温度和水的影响.本文通过对冻融后混凝土的宏观力学特性...     

聚氨酯灌封材料在汽车点火线圈中的应用

研究了汽车点火线圈用聚氨酯灌封料的应用工艺。分析了国产R1005型聚氨酯灌封材料在应用中出现的问题及其原因，提出了改进措施，使国产灌封材料替代了进口灌封材料，从而满足了汽车点火线圈的应用。     

Research on the interfacial reaction between amine group in urea and the coating materials of polyurethane coated urea

Abstract

In this work, the polyurethane coated urea (PCU) and PE coated urea (PECU) were prepared by spraying the coating material. The isocyanates coatings on the surface of urea and granule inorganic compound fertilizer (NPK) were prepared and their infrared spectra were compared. The polyurethane coatings of PCU was analyzed by IR. The interface morphology between the PU coating and PE coating PECU and the surface of urea was compared by scanning electron microscope. The inner and outer surfaces morphology of polyurethane coatings was studied. The results showed that the peak of -NCO groups in the infrared spectrum of the coating on urea was weaker than of the coating on NPK, while the peaks of N-H, C-N and C?=?O were all relatively stronger, which proved that -NH₂ in urea reacted with -NCO during the coating formation. SEM images showed that there was an obvious gap between PE coating and its urea core, while PU coating was tightly bonded with the surface of urea core, and the inner surface of PU coating had something undissolved after fully dissolved in water, which further illustrated that urea participate in the reaction of isocyanates with polyols. All of this results demonstrated that the amine group (-NH₂) in urea reacted with the -NCO group in isocyanates and urea linkage (-NH-CO-NH-) was formed in the polyurethane coating.     

Preparation and research of waterborne polyurethane phase change material

ABSTRACT

This paper first designed the molecular structure of the water-soluble polyurethane phase change material. Taking HDI (hexamethylene diisocyanate), PEG (polyethylene glycol), chain extender (DMPA (dimethylolpropionic acid), BDO (1,4- butanediol), EDA (ethylenediamine)), catalyst (DBTDL (February acid dibutyl tin)), neutralizing agent (TEA (triethylamine)) as the raw material, the paper then prepared the waterborne polyurethane phase change material, which is available for wet spinning process. The particle size, appearance, storage stability, water absorption, tensile strength and elongation at break of the WPUPCM emulsion were then tested. Moreover, the influences of reaction temperature, reaction time, R value (ie -NCO / -OH molar ratio), PEG relative molecular mass and DMPA content on the WPUPCM performance indicators were investigated. The study indicated that reaction temperature, reaction time, R value, PEG relative molecular mass and DMPA content show various influences on WPUPCM performance indicators. Therefore, in order to meet the requirements of practical application and determine optimal formulation and process parameters, further relevent studies based on comprehensive considerations of all factors are needed.     

基于光电传感器ADNS-2030无线鼠标的设计与实现

研究基于光电传感器ADNS-2030的无线鼠标设计,讨论了ADNS-2030无线鼠标的软件、硬件设计和系统组成,通过实际制作表明:无线鼠标的设计方案是合理可行的,该产品具有性价比高,功耗低,高分辨率,有效距离远等优点,具有一定的应用前景和推广价值.     

基于EP1C3的PCI任意波模块的设计

本文提出了一种价位低廉、体积小巧的高性能PCI任意波发生器解决方案.通过一片EP1C3来实现32位DDS内核波形发生控制逻辑,采用Altera公司的PCI IP core来实现PCI接口逻辑,再辅以高性能的信号调理电路使得该波形发生器采样率达到100 MSPS、40 MHz正弦波输出、64 k任意波存储深度.同时,在Labwindows/CVI环境下开发了PCI接口程序和软面板,该系统广泛应用于工控、医疗等领域.