共查询到19条相似文献,搜索用时 156 毫秒
1.
3.
3,4-二氢-3-取代基-2H-1,3-苯并噁嗪(简称苯并噁嗪),是一类新型的高性能热固性树脂,在加热和(或)催化剂的作用下发生开环聚合,生成含氮且类似酚醛树脂的网状结构,人们将这种新型树脂称作开环聚合酚醛树脂.自上世纪九十年代初以来,有关苯并噁嗪的研究工作取得了快速发展.本文较系统概述了国内外在苯并噁嗪中间体的合成、固化反应、结构与性能关系、应用开发等方面取得的进展,侧重介绍了四川大学在苯并噁嗪研究和应用方面取得的成果. 相似文献
4.
5.
RTM改性苯并噁嗪树脂及复合材料性能研究 总被引:1,自引:0,他引:1
研究了RTM改性苯并噁嗪树脂及复合材料性能.用DMA研究RTM改性苯并噁嗪树脂体系的储能模量、损耗模量和玻璃化转变温度;用流变仪研究黏度特性;用TGA和TGA微分曲线研究热分解性能;并研究了RTM改性苯并噁嗪树脂及复合材料的力学性能.结果表明:RTM改性苯并噁嗪树脂体系的玻璃化转变温度是206℃;至少有400min的低黏度(η≤0.5Pa.s)时间作为工艺开放期;在氮气气氛下,RTM苯并噁嗪树脂体系热失重分两个主要阶段,在375℃时发生5%热失重,800℃残碳率是45.2%;RTM苯并噁嗪树脂基体拉伸强度72.4MPa,拉伸模量5.07GPa,弯曲强度173MPa,弯曲模量4.6GPa;碳纤维增强RTM苯并噁嗪树脂基复合材料的常规力学性能优异. 相似文献
6.
7.
8.
从固化反应动力学、热分解动力学与耐烧蚀性能等方面研究了不同配比酚醛/苯并噁嗪共混树脂,并通过浸渍高硅氧玻璃布制备了相应的树脂复合材料。对其高常温力学、热学与耐烧蚀性能进行了研究。结果表明:共混树脂复合材料常温拉伸强度(214 MPa)、弯曲强度(332 MPa)、压缩强度(217 MPa)与高温层间剪切强度(21.6 MPa)等力学性能均高于酚醛树脂复合材料,热学与烧蚀性能符合耐烧蚀复合材料要求,可以作为一种性能优良的耐烧蚀复合材料。 相似文献
9.
以双酚A、甲醛分别和苯胺、间甲苯胺、对甲苯胺、3,5-二甲基苯胺为原料合成苯并噁嗪树脂.通过对比固化后树脂的介电常数,表明苯胺苯环上甲基的存在和不同位置对苯并噁嗪固化树脂介电常数存在影响.同时采用在树脂中引入氟原子的方法来降低树脂的介电常数.以甲醛、3,5-二甲基苯胺和双酚AF为原料合成了一种介电常数为2.93(1MHz),玻璃化转变温度为287℃的苯并噁嗪树脂. 相似文献
10.
11.
Junaid Siddiqui Mahtab Taheri Arif Ul Alam M. Jamal Deen 《Small (Weinheim an der Bergstrasse, Germany)》2022,18(1):2101171
Food wastage is a critical and world-wide issue resulting from an excess of food supply, poor food storage, poor marketing, and unstable markets. Since food quality depends on consumer standards, it becomes necessary to monitor the quality to ensure it meets those standards. Embedding sensors with active nanomaterials in food packaging enables customers to monitor the quality of their food in real-time. Though there are many different sensors that can monitor food quality and safety, pH sensors and time-temperature indicators (TTIs) are the most critical metrics in indicating quality. This review showcases some of the recent progress, their importance, preconditions, and the various future needs of pH sensors and TTIs in food packaging for smart sensors in food packaging applications. In discussing these topics, this review includes the materials used to make these sensors, which vary from polymers, metals, metal-oxides, carbon-based materials; and their modes of fabrication, ranging from thin or thick film deposition methods, solution-based chemistry, and electrodeposition. By discussing the use of these materials, novel fabrication process, and problems for the two sensors, this review offers solutions to a brighter future for the use of nanomaterials for pH indicator and TTIs in food packaging applications. 相似文献
12.
13.
Catherine Marichy Mikhael Bechelany Nicola Pinna 《Advanced materials (Deerfield Beach, Fla.)》2012,24(8):1017-1032
Atomic layer deposition (ALD) is a thin film technology that in the past two decades rapidly developed from a niche technology to an established method. It proved to be a key technology for the surface modification and the fabrication of complex nanostructured materials. In this Progress Report, after a short introduction to ALD and its chemistry, the versatility of the technique for the fabrication of novel functional materials will be discussed. Selected examples, focused on its use for the engineering of nanostructures targeting applications in energy conversion and storage, and on environmental issues, will be discussed. Finally, the challenges that ALD is now facing in terms of materials fabrication and processing will be also tackled. 相似文献
14.
Gyoung Hwa Jeong Suchithra Padmajan Sasikala Taeyeong Yun Gil Yong Lee Won Jun Lee Sang Ouk Kim 《Advanced materials (Deerfield Beach, Fla.)》2020,32(35):1907006
Rational design of 2D materials is crucial for the realization of their profound implications in energy and environmental fields. The past decade has witnessed significant developments in 2D material research, yet a number of critical challenges remain for real-world applications. Nanoscale assembly, precise control over the orientational and positional ordering, and complex interfaces among 2D layers are essential for the continued progress of 2D materials, especially for energy storage and conversion and environmental remediation. Herein, recent progress, the status, future prospects, and challenges associated with nanoscopic assembly of 2D materials are highlighted, specifically targeting energy and environmental applications. Geometric dimensional diversity of 2D material assembly is focused on, based on novel assembly mechanisms, including 1D fibers from the colloidal liquid crystalline phase, 2D films by interfacial tension (Marangoni effect), and 3D nanoarchitecture assembly by electrochemical processes. Relevant critical advantages of 2D material assembly are highlighted for application fields, including secondary batteries, supercapacitors, catalysts, gas sensors, desalination, and water decontamination. 相似文献
15.
16.
A Review on Piezoelectric,Magnetostrictive, and Magnetoelectric Materials and Device Technologies for Energy Harvesting Applications 下载免费PDF全文
17.
Satnam Singh Dheeraj Gupta Vivek Jain Apurbba K. Sharma 《Materials and Manufacturing Processes》2015,30(1):1-29
The main focused aim of developing new processing and manufacturing technologies are to reduce production or manufacturing costs, processing times, and to enhance manufactured product properties. The developed processing techniques should be widely acceptable for all types of materials including metal matrix composites, ceramics, alloys, and fiber reinforced plastics. Microwave materials processing is emerging as a novel processing technology which is applicable to a wide variety of materials system including processing of MMC, FRP, alloys, ceramics, metals, powder metallurgy, material joining, coatings, and claddings. In comparison to the conventional processes, microwave processing of materials offers better mechanical properties with reduced defects and economical advantages in terms of power and time savings. The present review work focuses mainly on global developments taking place in the field of microwave processing of materials and their relevant industrial applications. 相似文献
18.
Thoan Nguyen Hoang Khoa Bui Viet Dung Dang Duc 《Journal of Superconductivity and Novel Magnetism》2022,35(11):3051-3065
Experimental and theoretical studies on hydrogen in diluted magnetic semiconductors and related materials have been reviewed. A strong modification of magnetic order has been found by co-doping of hydrogen and magnetic ions in diluted magnetic semiconductors, which depended on the states of hydrogen acting in both crystalline and amorphous. In addition, the hydrogen was found to be strongly active with the magnetic ions resulting in modification of the electrical, magnetic, band structure properties, etc. We expect that our review could help to make a direction for the experimental and theoretical guide to develop advanced functional materials in silicon technology.
相似文献