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1.
High‐performance thermosets with tailored properties derived from methacrylated eugenol and epoxy‐based vinyl ester
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Yuehong Zhang Yuzhan Li Vijay Kumar Thakur Zhenhua Gao Jiyou Gu Michael R Kessler 《Polymer International》2018,67(5):544-549
A renewable chemical, eugenol, is methacrylated to produce methacrylated eugenol (ME) employing the Steglich esterification reaction without any solvent. The resulting ME is used as a low‐viscosity co‐monomer to replace styrene in a commercial epoxy‐based vinyl ester resin (VE). The volatility and viscosity of ME and styrene are compared. The effect of ME loading and temperature on the viscosity of the VE–ME resin is investigated. Moreover, the thermomechanical properties, curing extent and thermal stability of the fully cured VE–ME thermosets are systematically examined. The results indicate that ME is a monomer with low volatility and low viscosity, and therefore the incorporation of ME monomer in VE resins allows significant reduction of viscosity. Moreover, the viscosity of the VE–ME resin can be tailored by adjusting the ME loadings and processing temperature to meet commercial liquid molding technology requirements. The glass transition temperatures of VE–ME thermosets range from 139 to 199 °C. In addition, more than 95% of the monomer is incorporated and fixed in the crosslinked network structure of VE–ME thermosets. Overall, the developed ME monomer exhibits promising potential for replacing styrene as an effective low‐viscosity co‐monomer. The VE–ME resins show great advantages for use in polymer matrices for high‐performance fiber‐reinforced composites. This work is of great significance to the vinyl ester industry by providing detailed experimental support. © 2018 Society of Chemical Industry 相似文献
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VE432可控震源控制系统常见故障分析 总被引:1,自引:0,他引:1
VE432系统为新一代可控震源控制系统,文中简要地介绍了该系统的功能,根据实际生产中出现的常见故障进行分析并给出解决方法. 相似文献
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倾角是许多控制系统中需要测量的一个重要参数。针对倾角测量,设计了一种基于ARM微控制器和加速度传感器的角度测量平台。该平台采用基于ARMCortex—M3内核的STM32F103VE为数据处理的核心,利用高精度加速度传感器MMA7361L为测角传感器,同时配置液晶屏和小型键盘实现了人机交互。该平台具有测量精度高、灵敏度高、价格低的特点,应用前景广阔。 相似文献
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虚拟制造环境下VE型分配泵的研发 总被引:3,自引:0,他引:3
介绍了虚拟制造技术及其分类,探讨了以设计为中心的虚拟制造技术在汽车零部件研发中的实践.利用该技术,以柴油发动机VE型分配泵为研究对象,重点分析了传动部件易断裂问题,研究内容涉及产品全生命周期的各个阶段,包括虚拟样机设计、虚拟样机运动学动力学仿真、虚拟装配、有限元分析和零件虚拟加工仿真等,并对研究结果进行了实验验证.结合企业实际,给出了解决方案. 相似文献
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基于STM32的FSMC接口驱动TFT彩屏设计 总被引:1,自引:0,他引:1
TFT-LCD技术是微电子技术和LCD技术巧妙结合的高新技术。随着人们对图像清晰度、刷新率、保真度的要求越来越高,TFT-LCD的应用范围越来越广。介绍了TFT数字彩屏的工作原理,利用STM32处理器的FSMC接口设计出了一种能直接驱动数字液晶屏的方法。设计的硬件电路和软件程序均能对显示控制芯片进行有效的控制。在实际应用中显示清晰流畅,并且CPU有足够的时间来处理用户程序。该方案能成功应用在电脑横机的人机界面显示中,且其硬件电路结构简单、控制方式灵活、对于其他型号的接口芯片也能提供参考。 相似文献
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Selection of partners in virtual enterprise paradigm 总被引:4,自引:0,他引:4
Agility is the competitive advantage in the global manufacturing environment. It is believed that the agility can be realized by dynamically reconfigurable virtual enterprise. However, the configuration of virtual enterprises is a challenge to us. In selecting the partners for the reconfiguration of virtual enterprise, many factors should be taken into consideration. However, the manufacturing cost and time to market are the most important factors. In this paper, in considering the completion time as a constraint we model the partner selection problem by an integer programming formulation to minimize the manufacturing cost. The formulation is then transformed into a graph-theoretical formulation and a 2-phase algorithm is developed to solve the problem. In the first phase, a polynomial bounded algorithm is proposed to find the earliest completion time, so we obtained a feasible solution. In phase 2, we improve the solution by exchanging the candidate partners in keeping the solution in the feasible region. Although we may not find the optimal solution for the problem by the improvement algorithm, the objective is reduced iteration by iteration. Thus, the algorithm is efficient and can be applicable to practical problems. An illustrative example is presented to show the application of the proposed algorithm. 相似文献