多壁碳纳米管/硬脂酸-十八醇@脲醛树脂微胶囊的制备及表征

通过原位聚合法以硬脂酸-十八醇低共融复合相变材料（SA-OA,质量比为50.02%,相变温度为55℃）为芯材,三聚氰胺改性的脲醛树脂（UF）为壁材,氨基化多壁碳纳米管（MWCNTs-NH₂）为高导热填料制备了MWCNTs/SA-OA@UF相变微胶囊。采用FTIR、SEM、DSC、TGA和导热系数仪,对MWCNTs/SA-OA@UF相变微胶囊的化学结构、表面形貌、相变性能和导热性能进行表征。讨论了不同的MWCNTs修饰方法、不同乳化剂种类和MWCNTs-NH₂添加量对SA-OA@UF相变微胶囊的影响。结果表明:MWCNTs-NH₂在溶液中分散性良好;十二烷基苯磺酸钠（SDBS）和曲拉通X-100复配乳化剂使SA-OA@UF相变微胶囊的表面形貌更加光滑平整;添加质量比为0.5%的MWCNTs-NH₂,使MWCNTs/SA-OA@UF相变微胶囊的导热系数达到0.224 W/（m·K）,提高了38%（55℃）,包覆率提高了6.9%,粒度更加均一,热稳定性有明显提高。      

苯胍胺改性三聚氰胺甲醛树脂的合成研究

以NaOH为催化剂,在反应温度不超过90℃下,苯胍胺的加入可以改善三聚氰胺甲醛树脂体系的贮存稳定性,但树脂的固含量、黏度等指标与树脂的贮存稳定性没有明显的规律可循。作为发泡材料用树脂,树脂的固含量为90%左右时,发泡效果最好。     

木质素改性三聚氰胺甲醛树脂发泡材料的研究

木质素可以改性三聚氰胺甲醛树脂,尤其是采用含有羧基的木质素改性三聚氰胺甲醛树脂,且在甲醛与三聚氰胺的比值(摩尔比)均为5.0左右时,其反应条件温和,树脂的贮存稳定性比传统的木质素改性三聚氰胺甲醛树脂大大提高。上述树脂均可发泡,且以含有羧基的木质素改性三聚氰胺甲醛树脂的综合性能最好。这对开发新型的生物质泡沫材料提供了依据。     

聚丙烯酸酯胶粘剂的合成与表征

本文研究了丙烯酸酯类胶粘剂 .通过采用不同单体、引发剂及引发剂的用量 ,合成一系列丙烯酸酯系胶粘剂 .并对其粘度、粘接强度 ,含固量和固化时间的检测找出最佳条件 ,测得了一系列性能参数显示较好的综合性能 .     

改性脲醛树脂-石蜡相变储能微胶囊的制备及表征

以三聚氰胺改性的脲醛树脂为囊壁,通过原位聚合法分别对非离子型和阴离子型石蜡乳液进行包覆,制备微胶囊。研究结果表明,采用由硬脂酸和氨水制备得到的阴离子型石蜡乳液为囊芯材料,囊芯与囊壁质量比为1.6时,包覆率达52.41%,囊壁可提供良好的热传导能力。制备得到的微胶囊热焓值为166 J/g,具有较好的相变储能效果。     

Synthesis of carbon microspheres from urea formaldehyde resin

Carbon microspheres were synthesized through polymerization of urea/formaldehyde in the presence of formic acid as catalyst, followed by drying and carbonization in an inert atmosphere. The samples were characterized by SEM, XRD, HRTEM, elemental analysis and XPS. The obtained carbon microspheres were amorphous indicated by the results of XRD and HRTEM. The changes of nitrogen functionalities at 400-1000 °C were determined by XPS. The fraction of pyridine nitrogen and pyrrole/pyridone nitrogen decreased with increasing temperature, whereas the amount of quaternary nitrogen increased.     

拟薄水铝石改性环氧树脂复合材料的制备与性能

采用水热合成法制备拟薄水铝石(AlOOH)纳米棒,以3-氨基丙基三乙氧基硅烷(APTES)为表面改性剂,制得mAlOOH,以环氧树脂(Epoxy,EP)为基体,制备AlOOH/EP和mAlOOH/EP复合材料。研究AlOOH和mAlOOH的填充量对AlOOH/EP及mAlOOH/EP复合材料性能的影响。结果表明,mAlOOH明显提高了mAlOOH/EP复合材料的力学性能。mAlOOH的填充量为4wt%时,mAlOOH/EP复合材料的冲击强度和弯曲强度分别比聚合物基体分别提高了259%和44%;填充量不超过5wt%时,mAlOOH/EP的介电常数与介电损耗均略低于纯环氧树脂。当添加量为3wt%时,mAlOOH/EP具有最低的介电常数和介电损耗及最高的玻璃化转变温度(123℃)。      

水性环氧丙烯酸酯的制备与表征

通过双羟基化合物中的羟基与环氧树脂反应 ,获得具有亲水链段两端为环氧基的改性环氧树脂 ,然后和丙烯酸羧基发生酯化反应 ,制得水性环氧丙烯酸酯。研究了催化剂种类、催化剂用量和反应温度对转化率的影响 ,结果表明选用KOH作催化剂 ,用量为 0 7% ,反应温度为 90℃时所得产物外观和水溶性都很好。采用FT IR红外光谱对所合成的树脂的结构进行了表征 ,表明获得了目的结构的产物。     

强极性大孔树脂的合成与表征

本实验制备的大孔吸附树脂主要以己二酰氯等为原料,以一定比例的吡啶与1,4-二氧六环的混合溶液为复合氧化剂,在纤维素的均相溶液中,加入一定比例的环己烷与石蜡的混合溶液为致孔剂聚合而成.其中,纤维素为聚合单体,己二酰氯为交联剂,它们互相交联聚合形成了大孔吸附树脂的多孔骨架结构,是一类含离子交换基团的交联聚合物.合成的大孔树...     

凹凸棒石/油菜秸秆木质陶瓷的制备及性能

为了资源化利用油菜秸秆等废弃物,以油菜秸秆和凹凸棒石为原料,以酚醛树脂为黏结剂,通过复合、热压、烧结等工艺过程制备了凹凸棒石/油菜秸秆木质陶瓷.对不同原料质量配比和烧结温度下制备的复合材料进行性能测试.结果表明,采用该工艺制备凹凸棒石/油菜秸秆木质陶瓷是可行的,原料的选择、质量配比、烧结温度等参数对材料制备过程及性能均有较大的影响.油菜秸秆与凹凸棒石质量配比为1:2时复合材料的力学性能较好,烧结温度在600～700℃时,残炭率最高;在600～800℃范围内,抗弯强度的提高达到最佳;在800℃时,导电性能得到改善.     

凹凸棒石/油菜秸秆木质陶瓷的制备及性能

为了资源化利用油菜秸秆等废弃物, 以油菜秸秆和凹凸棒石为原料, 以酚醛树脂为黏结剂, 通过复合、 热压、 烧结等工艺过程制备了凹凸棒石/油菜秸秆木质陶瓷。对不同原料质量配比和烧结温度下制备的复合材料进行性能测试。结果表明, 采用该工艺制备凹凸棒石/油菜秸秆木质陶瓷是可行的, 原料的选择、 质量配比、 烧结温度等参数对材料制备过程及性能均有较大的影响。油菜秸秆与凹凸棒石质量配比为1∶2时复合材料的力学性能较好, 烧结温度在600~700 ℃时, 残炭率最高; 在600~800 ℃范围内, 抗弯强度的提高达到最佳; 在800 ℃时, 导电性能得到改善。     

光催化降解甲醛功能泡沫炭的制备与表征

以聚氨酯为骨架,在泡沫成型过程中加入颗粒活性炭,经炭化得到孔结构发达的聚氨酯泡沫炭,以其为基底采用浸渍法制备出TiO_2负载的具有光催化性能的复合材料。采用SEM观测不同活性炭量泡沫炭的表面形貌;采用BET吸附-脱附等温曲线考察制备不同的泡沫炭及复合材料的孔径结构;XRD分析不同产物的晶型结构;TG分析碳骨架热分解过程。以气相甲醛为模型物,评价泡沫炭/TiO_2复合材料在紫外灯光下对甲醛气体的光催化降解性能。结果表明,聚氨酯泡沫炭/TiO_2复合材料具有良好的催化降解甲醛功能,是吸附与降解协同作用的结果;当活性炭含量为35%,TiO_2的负载量为2%时,对甲醛吸附降解能力最好,达到85.3%。     

甲醛/尿素/TDI三元疏水改性聚乙烯醇的制备及影响因素

采用正交实验方法,研究了甲醛、尿素和甲苯二异氰酸酯对聚乙烯醇的疏水改性,并分析了合成条件对其固含量、黏度、溶出率和交联度的影响.     

Preparation and thermal stability of amine-terminated polyesterimide modified epoxy resin

In this research, a novel amine-terminated polyesterimide (AT-PEsI) having 1.324 Pa.s of inherent viscosity was synthesized from polyester and pyromellitic dianhydride, p-toluene sulphonic acid as catalyst and characterized by FT-IR and ¹H-NMR spectroscopy. Epoxy resin was modified by the soluble and fusible AT-PEsI prepolymer for improving both thermal and mechanical properties of electronic packaging materials. The AT-PEsI modified epoxy resin was cured by 4,4-diaminodiphenyl ether. The thermal stability of the cured materials was studied with thermogravimetric analysis (TGA) and thermo-mechanical analysis (TMA). The coefficients of thermal expansion of the modified ER materials decrease with the content of AT-PEsI in ER. The results from TMA and TGA show that modified epoxy resins have better thermal stability than pure ER. The morphology of modified ER materials was also evaluated by scanning electron microscopy for the investigation of fracture surface. The results show that the AT-PEsI modified epoxy resin materials exhibit better toughness than pure ER.     

C级无溶剂有机硅浸渍树脂的制备及表征

以甲基苯基硅烷单体和特种硅烷单体制备有机硅氧烷预聚物出发合成了一种有机硅浸渍树脂,该浸溃树脂不含任何有机溶剂,在常温下为低黏度流动液体.采用红外光谱、核磁共振、扫描电镜和凝胶色谱对浸渍树脂的结构和物理特性进行了表征.结果表明,该类浸渍树脂分子结构中含有硅氢和乙烯基团的聚有机硅氧烷,属分子量较小的低聚物.     

Wear behaviour of organic asbestos based and bronze based powder metal brake linings

Bronze based brake linings, were produced by powder metallurgy technique and their wear behaviour was investigated and compared to that of asbestos ones. Bronze powders were compacted under 350, 500 and 600 MPa pressures and sintered at 810 °C in ammonia atmosphere for 75 min. For the same friction distance, it was determined that temperature increase in the bronze based brake linings was lower than that of asbestos based ones. However, higher wear rate was observed in the bronze based brake linings. Moreover, thermal conductivity was decreased with high porosity level with low densities. Although, friction coefficient remained the same during breaking, an increase in wear resistance was observed.     

酚醛基非支撑介孔炭膜的软模板法制备与表征

以酚醛树脂为碳前驱体,两亲嵌段共聚物F127为软模板,在碱-酸体系条件下合成非支撑介孔炭膜。通过扫描电镜(SEM)、透射电镜(TEM)、低温氮气吸附-脱附和气体分离测试对炭膜的形貌、孔结构以及气体分离性能进行了测试和表征。结果表明,通过改变软模板剂F127的用量和炭化温度可以实现对炭膜孔结构的控制制备。随着F127与苯酚质量比的增大,炭膜的比表面积、总孔容以及平均孔径呈先增大后减小的趋势;在质量比为1.06时,比表面积达467 m2/g,介孔率为31.3%。随炭化温度由600℃升高至800℃时,炭膜的孔结构由无规则的蠕虫状孔结构转变成丰富的二维六方孔道结构。炭膜厚度约300μm,对CO2和N2具有良好的分离性能,CO2/N2分离系数可达2.53。     

Yttrium silicate and oxonitridosilicate luminescent materials from a silicone resin and nano-sized fillers

Yttrium silicate and oxonitridosilicate ceramic powders have been successfully prepared by heat treatment, at 1300–1400 °C, of a silicone resin embedding Y₂O₃ nano-sized particles as reactive fillers. Nano-sized RE-oxides (Eu₂O₃, CeO₂), used as secondary additives, promoted the development of apatite phase, in both air and N₂ atmosphere. For treatments in nitrogen, the only crystal phase consisted of yttrium nitrogen apatite, mixed with amorphous silicon oxycarbide (SiOC). Eu-doped and Ce-doped yttrium silicates were characterized by means of UV–visible luminescence and ion beam induced luminescence (IBIL). Strong luminescence features were observed, depending on the conditions of thermal treatment.     

锰酸锂的制备、表征及甲醛降解性能研究

目的:在不同水热温度下制备锰酸锂,对其结构进行详尽表征,并对其低浓度甲醛降解性能进行探索。方法:采用抗坏血酸、LiOH、KMnO_4为原料合成了锰酸锂,并通过X射线衍射(XRD)、氮气吸脱附、X射线光电子能谱(XPS)、透射电子显微镜(TEM)等对材料进行表征;并将四种催化剂应用于低浓度甲醛降解测试。结果:随水热温度从150℃升到230℃,锰酸锂的结晶性提高;LiMn_2O_4-210比表面积最大且表面氧与氧缺陷占比最高;TEM结果表明LiMn_2O_4-150为无定型结构,LiMn_2O_4-170与LiMn_2O_4-190结晶度较差,LiMn_2O_4-210和LiMn_2O_4-230的产物为八面体结构。结论:LiMn_2O_4-210具有最高的甲醛降解率,10 h内的甲醛降解率可达97%。