以通用有效介质理论为基础，给出了炭黑填充导电橡胶（导电炭黑／橡胶）的温度传感器电阻一温度计算模型。利用该模型得出材料的灵敏系数计算公式，并结合形变和电阻率的变化对正电阻一温度特性（PTCR）的影响分析材料的灵敏系数特性。结果表明：在炭黑分布均匀、体积分数在渗流体积分数附近等条件下，电阻一温度计算模型与实验吻合，表现出一致的PTCR变化规律。导电炭黑／橡胶的PTCR效应主要源于基体膨胀导致炭黑体积分数的稀释作用，若炭黑体积分数在渗流区，导电炭黑／橡胶的灵敏系数为280-420；当炭黑体积分数在传导区时，其灵敏系数为32．5-62．0。导电炭黑／橡胶的PTCR效应是热一形变与形变一电导过程的乘积效应，导电炭黑／橡胶的灵敏系数高，但其体积膨胀系数低，使材料的电阻温度系数较低。
A formula of positive temperature coefficient of resistance （PTCR） of conductive rubber filled by carbon black （CB） used for temperature sensor was given by general effective media theory. The sensitive coefficient was analyzed by the equation of sensitive coefficient deduced from the formula of PTCR and the impact of the strain and resistivity on PTCR effect. The formula of PTCR is constant in the experiment when the CB is homogeneously dispersed and the volume fraction of CB is close to the critical threshold. A dilution of the volume fraction of CB due to the volume expansion of the composites has a significant influence on PTCR effect. When the volume fraction of CB is within the percolation zone, the sensitive coefficient is from 280 to 420, and it is from 32.5 to 62.0 when the volume fraction of CB is within the conductive zone. PTCR effect is a complex process of the heat - deformation and the deformation- conductivity. Due to the low coefficient of cubical expansion, the conductive carbon black/rubber has high sensitive coefficient, but the value of PTCR is low.
参考文献
| [1] | 宋义虎,郑强,刘小蕊,等.炭黑和石墨填充聚乙烯导电复合材料电阻的外场依赖性[J].材料研究学报,2000,14(2):141-146. |
| [2] | 黄英,刘平,赵兴,等.压力/温度复合柔性触觉传感器用导电橡胶的外场特性[J].高分子材料科学与工程,2010,26(12):95-98. |
| [3] | 益小苏.复合导电高分子材料的功能原理[M].北京:国防工业出版社,2004:1-37. |
| [4] | 沈烈,杨辉,钱跃程,等.炭黑一碳纤维填充双组分聚合物体系的导电网络及其阻温特性[J].复合材料学报,2010,27(4):9-14. |
| [5] | Yang Y J, Cheng M Y, Chang W Y, et al. An integrated flexible temperature and tactile sensing array using PI - copper films [J]. Sensors and Actuators A, 2008, 143.- 143-153 |
| [6] | Shimojo M, Namiki A, Ishikawa M, et al. A tactile sensor sheet using pressure conductive rubber with electrical-wires stitched method [J]. IEEE Sensors Journal, 2004, 4(5): 589-596. |
| [7] | Lichtenwalner D J, Hydrick A E, Kingon A I. Flexible thin film temperature and strain sensor array utilizing a novel sensing concept [J]. Sensors and Actuators A, 2007, 135: 593-597. |
| [8] | Huang Y, Liu P, Zhang Y G, et al. Piezoresistive characteristic of conductive rubber for flexible tactile sensor : Journal of Wuhan University of Technology: Materials Science Edition, 2011, 26(3): 443-448 |
| [9] | Thomas V P, Julian L, Mark L. A large area force sensor for smart skin applications [J]. Sensors, 2002, 2 : 1620-1624. |
| [10] | Voet A. Temperature effect of electrical resistivity of carbon black filled polymers [J]. Rubber Chemistry and Technology, 1980, 54: 42-50. |
| [11] | Allak H M, Brinkman A W, Woods J. I -V characteristics of carbon black-loaded crystalline polyethylene [J]. Journal of Materials Science, 1993, 28: 117-120. |
| [12] | Aneli D N. Composites based on rubber filled by carbon black [J]. International Polymer Science and Technology, 1986, 13 (10) : 91-99. |
| [13] | Narkis M, Ram A, Stein Z. Electrical-properties of carbon- black filled crosslinked polyethylene [J]. Polymer Engineering and Science, 1981, 21(16): 1049-1054. |
| [14] | Narkis M, Ram A, Stein Z. Effect of cross linking on carbon black-polyethylene switching materials [J]. Journal of Applied Polymer Science, 1980, 25(7): 1515-1518. |
| [15] | 狄卫华,张国,赵竹弟,等.聚乙烯/碳纤维复合材料的PTC效应[J].高等学校化学学报,2003,24(11):2122-2124. |
| [16] | SuchtelenJ V. Product properties: A new application of composite materials [J]. Philips Research Reports, 1972, 27(1) : 28-37. |
| [17] | Sherman R D, Middleman L M, Jacobs S M. Electron transport processes in conductor-filled polymers [J]. Polymer Engineering and Science, 1983, 23(1): 36-46. |
| [18] | Yi X S, Shen L, Pan Y. Thermal volume expansion in polymeric PTC composites: A theoretical approach [J].Composites Science and Technology, 2001, 61: 949-956. |
| [19] | Mclachlan D S, Blaszkiewicz M, Newnham R E. Electrical resistivity of composites [J]. Journal of American Ceramic Society, 1990, 73(8): 2187-2203. |
| [20] | Blaszkiewicz M, Mclachlan D S, Newnham R E. The volume fraction and temperature dependence of the resistivity in carbon black and graphite polymer [J]. Polymer Engineering and Science, 1992, 32(6): 421-425. |
| [21] | 刘迎春,叶湘滨.传感器原理设计与应用[M].长沙:国防科技大学出版社,2006:60-61. |
| [22] | Wang M J. Effect of polymer-filler and filler-filler interactions on dynamic properties of filled vulcanizates [ J ]. Rubber Chemistry and Technology, 1998, 71: 520-589. |
| [23] | 王鹏,丁天怀,徐峰,等.炭黑填充型导电复合材料的压阻计算模型及实验验证[J].复合材料学报,2004,21(6):34-38. |
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