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【期刊论文】四针状ZnOw的微波吸收及微波一热转换特性研究*
周祚万, , 楚珑晟, 刘世楷, 顾利霞
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-1年11月30日
用四针状ZnOw为吸波剂主要成份制备了一种轻质高效吸波涂料,并对其在Ku波段的吸收特性作了初步研究。结果表明,在13.5~17.5GHz的Ku波段,上述材料雷达波反射率均达到-10~-20dB。进一步的研究表明,涂层的吸波效果与ZnOw针状体的长径比有关,在13.50~17.50GHz的频率范围内,控制ZnOw针状体平均长径比为30~50,可荻得最住果。ZnOw微波一热转换的初步研究发现,ZnOw及其复合材 料具有优异的微波一热转换性能,当ZnOw针状体长径比为40~60的情况下,表观比重为0.15~O.18g/cm3,可以达到最佳发热 效率。
四针状氧化锌晶须, 雷达波吸收, 微波一热转换
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周祚万, , 楚珑晟, 唐明文, 顾利霞
高分子材料科学与工程,2004,20(3):202~205,-0001,():
-1年11月30日
对ZnO晶须/NR复合材料的实验研究表明,表面改性后的ZnO晶须对NR具有显著的增强和抗老化作用,其增强效果沿橡胶混炼剪切方向与垂直剪切方向几乎相同。对ZnO晶须/PPS复合体系的研究结果表明,偶联剂表面处理后的ZnO晶须对PPS有显著的增强作用。研究发现,经典的预测复台材料强度的理论公式可以较好地预测Zn0晶须/NR体系,但对ZnO晶须/PPS复合材料的预测则与实测值存在较大差异。分析认为其主要原因是该晶须特殊的空间四针状结构能有效地传递受力,尖端作用避免了端口应力集中引起的破坏。
四针状氧化锌晶须, 增强, 天然橡胶, 聚苯硫醚
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【期刊论文】Tetrapod-shaped ZnO whisker and its composites
周祚万, Zuowan Zhou*, Weiming Peng, Shaoying Ke, Hai Deng
Journal of Materials Processing Technology 89 90(1999)415-418,-0001,():
-1年11月30日
Tetrapod-shaped zinc oxide whisker has been prepared with high purity and good yield ill a short reaction time using a new method, the gas expanding method, which is the oxidation of pellets or other shaped metallic zinc at 500 800℃ and at atmospheric pressure. The results show that this is a practical and economical method for the manufacturing of ZnO whiskers with a peculiar shape of tetrapod. A suitable ratio for the volume of the furnace chamber and the quantity of the metallic zinc has been suggested. The structures of the products were studied by SEM and X-ray diffraction analysis. The microwave absorption of the composites of ZnO whisker/chlorobutadiene rubber has been investigated, and the result indicates that the composites are of excellence with respect to microwave absorption. The results of vibration lests of polyvinyl chloride show that material containing tetrapod-like ZnO whisker appears to have superior damping characteristics.
Tctrapod-shaped ZnO whisker, Preparation, Composites, Microwave absorption, Vibration damping
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【期刊论文】Studies on the Thermal Properties of Poly (phenylene sulfide amide)
周祚万, ZUOWAN ZHOU, , QIXIAN WU
Journal of Applied Polymer Science, Vol. 66, 1227-1230 (1997),-0001,():
-1年11月30日
Thermal properties ofpoly (phenylene sulfide amide) (PPSA) prepared using sodium sulfide, sulthr, and thiourea as sulthr sources which reacted with dichloro-benzamide (DCBA) and alkali in polar organic solvent at the atmospheric pressure, were studied. The glass transition temperature (Tg), melting point temperature (Tm), and melting enthalpy (AHm) of the related polymers were obtained by use of differential scanning calorimetry analysis. The results are: Tg=103.4-104.5℃,Tm=291.5 304.7℃, and △Hm=104.4-115.4 J/g. Thermal properties such as thermal decomposi tion temperature and decomposition kinetics were investigated by thernmgravimetric analysis under nitrogen. The initial and maximum rate temperatures of degradation were found to be 401.5-411.7℃ and 437-477℃, respectively. The parameters of therreal decomposition kinetics of PPSAs were worked out to be: activation energy ofdegra-dation was 135 to 148 kJ/mol and the 60-s half life temperature was 360 to 371℃.
poly (, phenylene sulfide amide), , thermal transition behavior, thermal decomposition kinetics
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周祚万, ZUOWAN ZHOU, , SHIKAI LIU, LIXIA GU
Journal of Applied Polymer Science, Vol. 80, 1520-1525 (2001),-0001,():
-1年11月30日
Zinc oxide whisker with a tetrapod shape was treated with a coupling agent using an orthogonal design and was mixed into the substrate of natural rubber to obtain the composites. The results of the experimental tests show that the tensile strength of the composites progressively increases with an increased amount of the related whisker. The experiments also indicate that the rubber reinforced by the tetrapod-shaped ZnO whisker is distinct isotropy. The wear tests demonstrate that the composites containing ZnO whisker appear to have good wear-resistance behavior.
ZnO whisker, surface treatment, rubber composites, tensile strength, wear test
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