阻焊油墨结构对其性能及可靠性的影响

阻焊油墨作为有机-无机复合材料,其结构及性能会直接影响印制电路板(PCB)的可靠性。阻焊油墨的主要结构包括有机结构和无机结构,掌握阻焊油墨2种主要结构对其性能及PCB可靠性的影响具有重要的指导意义。通过调控烘烤参数和光热固化条件来调节阻焊油墨无机填料的分散及有机光热反应率,并分析了无机填料分散情况和有机光热反应率对阻焊油墨的性能及PCB可靠性的影响。结果表明,在当前实验条件下,阻焊油墨的光热反应率对其性能和PCB的可靠性影响较大。

丙烯酸改性环氧树脂的制备及其光热双重固化体系的性能

以1,3-双(N,N-二缩水甘油胺甲基)环己烷(AG602)和α-甲基丙烯酸为原料,采用部分开环改性的方法制备了50%酯化率的丙烯酸改性环氧树脂AGMA,通过酸值、环氧值的测定以及红外光谱测试证明了AGMA树脂制备成功。设计了光固化、热固化和光热固化三种固化体系制备了AGMA树脂浇注体,研究了三种固化体系的力学性能、热机械性能、热稳定性以及断裂面微观形貌。结果表明光固化体系未能达到一定的固化度,性能较差。热固化体系各方面性能要远高于光固化体系,但固化时间较长。光热固化体系固化时间大大缩短,固化工艺简便,浇注体的综合性能优于热固化体系。

某火工品用光热双重固化胶粘剂的研究

根据某火工品粘接要求,研制了紫外光和热双重固化的胶粘剂,讨论了预聚物、活性稀释剂、光引发剂、热引发剂对粘接剂附着力和粘接强度的影响。结果表明,光热双重固化胶粘剂满足该火工品粘接速度快、粘接强度高的要求。

光热双重固化胶粘剂的热固反应动力学研究

采用非等温示差扫描量热法对光热双重固化胶粘剂的热固化性能以及固化动力学进行了研究。根据Kissinger,Ozawa及Crane方程结合n级反应模型和自催化反应模型计算得到固化反应动力学参数。结果表明,紫外光处理后胶粘剂体系的特征固化温度下降。n级反应动力学模型与实验值相比存在较大差别,而自催化反应模型能够较好地与实验值吻合,并能较好地描述紫外光处理前后胶粘剂体系的热固反应过程,解释了紫外光处理降低固化反应温度的机理。

Hydrothermal synthesis of monodisperse Zn_(x)Cd_(1-x)S spheres and their photocatalytic properties

Monodisperse ZnxCd1-xS spheres were successfully fabricated with a high yield by a facile hydrothermal route.The as-prepared samples were characterized by X-ray diffractometry,scanning electron microscopy and UV-vis diffusion reflectance spectroscopy.The results indicate that all the prepared samples have the same hexagonal wurtzite phase and exhibit good size uniformity and regularity.Degradation of rhodamine-B（RhB） was used to evaluate the photocatalytic activities of ZnxCd1-xS samples.Zn0.4Cd0.6S possessed the best photocatalytic activity and exhibited high stability during the reaction.

Synthesis and properties of UV curable polyurethane acrylates based on two different hydroxyethyl acrylates

Two kinds of UV curable polyurethane acrylate oligomers （PUPA and PUCA） were synthesized via the addition reaction between isophorone diisocyanate （IPDI） and polyethylene glycol monoacrylate （PEA6） or polycaprolactone modified hydroxyethyl acrylate （PCLA2）. The structures of PUPA and PUCA were characterized by Fourier transform infrared spectroscopy （FT-IR）, IH nuclear magnetic resonance （^H NMR）, gel permeation chromatography （GPC） and differential scanning calorimeter （DSC）, and the thermal stability and dynamic mechanical thermal properties of their cured films were measured by thermogravimetric analysis （TGA） and dynamic mechanical analysis （DMA）, respectively. The viscosity of the oligomers and mechanical properties of the cured films were also studied. The results show that both oligomers have narrow molecular weight distribution. The viscosity of PUPA is 2.310 Pa.s at 25 ℃, while that of PUCA is： up to 3.980 Pa-s. The UV cured PUPA and PUCA films have homogeneous phase structure, and the PUCA film shows higher glass transition temperature and storage modulus. Furthermore, the PUCA film possesses better mechanical properties than PUPA, while the latter shows better alkali resistance.

改性端羟基聚丁二烯液体橡胶光热双重固化材料的制备及性能表征

以经过丙烯酰氯改性的端羟基聚丁二烯液体橡胶、铝粉、氯化钾、过氧化苯甲酰(BPO)、光引发剂819作为原料制备了光热双重固化橡胶材料。分析测试了改性端羟基聚丁二烯液体橡胶光热双重固化材料的断裂拉伸强度和吸水率。讨论了光引发剂用量对材料力学性能、吸水性的影响。实验结果表明,随着光引发剂使用量的增加,橡胶材料的断裂拉伸强度降低,吸水能力变差。使用6份和10份光引发剂的光热双重固化材料分别显示了最大断裂拉伸强度(0.69MPa)和最小断裂拉伸强度(0.61MPa),最高吸水率(49.20%)和最低吸水率(25.92%)。