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第2期 李永等:磁致取向对镍粉填充丙烯酸酯复合涂层导电与屏蔽性能的影响 ·223。 可以增加施加磁场的强度与减小体系的黏度.由于 manganite coatings for EM I shielding against dimected energy pul 该取向时间是在理想情况下推导出的,忽略了磁性 es.Prog Org Coat,2003.47:190 微粒间的短程斥力、粒子布朗运动等因素的影 [5 Wang H.Ren Z M,Deng K.et al.Effects of static magnetic field on solidification structu re of MnBi phase in semi-solidfied Bi 响,因此实际工程应用中取向时间还需要通过实 Mn alloy.Acta Metall Sin,2002.38(1):41 验来确定 (王晖,任忠鸣,邓康,等.磁场对B一Mn合金两相区中MnB 相凝固组织的影响.金属学报.2002.38(1):41) 3结论 [6 Duan Y P,Liu S H,Guan H T,et al.Effects of high magnetic 对于镍粉/聚丙烯酸酯复合材料体系,在固化前 field on gmin shape and eectrieal conductivity of doped polyani line.Acta Chem Sin,2005,63(17):1595 施加平行磁场可以使活性导电镍粒子发生偏转和聚 (段玉平,刘顺华,管洪涛,等.强磁场作用对聚苯胺颗粒形貌 集,使材料的微观组织具有取向性,形成“纤维束”状 及电性能的影响.化学学报,2005,63(17):1595) 的微观组织.磁致取向可以提高体系的电导率,该 [7]Zhang B W.Xie C S.Hu J H,et al.Magnetic-ficld-induced 影响在体系中导电填料的含量较低时比较明显,并 alignment of metal nanoparticks in polymer:experiments and 使其导电阀值从5.6%降至3.0%(体积分数).磁 mokcular dy namics simulation.Chem J Chin Univ,2005.26 致取向可以对复合材料的屏蔽效能进行优化.通过 (11):2131 (张邦文谢长生,胡军辉,等。金属纳米粒子在聚合物中的磁 控制固化前体系的动力学黏度和磁场强度,可以改 致排列:实验及分子动力学模拟.高等学校化学学报,2005. 变磁致取向的时间. 26(11):2131) 参考文献 [8 Shen L,Zhang Z Y,Wang JJ,et al.Electrical and thermal con- duictivity of polymers loaded with conductive filer.Polymer [1]Li X,Wang H.Ren Z M,et aL.Development of the stable high Mater Sci Eng,2006.22(4):107 magnetic field technology and its application in material science. (沈烈,张稚燕,王家俊,等.填充型聚合物基复合材料的导电 Mater Rev,.2002.16(10):25 和导热性能.高分子材料科学与工程,2006.22(4):107) (李喜,王晖.任忠鸣,等.稳恒强磁场技术的发展及其在材料 [9 Li H W,Huang W X,Guan D G,et al.Research of the w ater 科学中的应用.材料导报,2002.16(10):25 based Nibased elect romagnetic shieHing coating.J Func Mater [2]Uyeda C,Tanaka K,Takashima R,et al.Magnetic alignment at Devices,2004,10(1):107 reduced field intensity due to decnease of temperature observed for (李洪武,黄婉霞,管登高,等.水性镍基电磁屏蔽涂料研究 nonfermomagnetic particles possessing paramagnetic and damag- 功能材料与器件学报,2004.10(1):107) netic anisotropy.J App/Phys,2004,43:980 10 Zhang B W,Ren Z M,Wang H,et al.On dynamics of grain [3]Rango P D.Lee M,Leay P,et al.Texturing of magnetic mate- alignment during alloy solidification under applied magnetic field. rials at high temperat ure by solidification in a magnetic field.Na- Acta Meta ll Sin.2004.40(6):604 ue,1991,349:770 (张邦文,任忠鸣,王晖等.合金凝固过程中品粒磁取向的动 [4]Chhiu T L,Bamy S,Mark K,et al.Nanograin magnetoresistive 力学研究.金属学报,2004.40(6):604可以增加施加磁场的强度与减小体系的黏度 .由于 该取向时间是在理想情况下推导出的, 忽略了磁性 微粒间的短程斥力、粒子布朗运动等因素的影 响[ 7] , 因此实际工程应用中取向时间还需要通过实 验来确定 . 3 结论 对于镍粉/聚丙烯酸酯复合材料体系, 在固化前 施加平行磁场可以使活性导电镍粒子发生偏转和聚 集, 使材料的微观组织具有取向性, 形成“纤维束”状 的微观组织 .磁致取向可以提高体系的电导率, 该 影响在体系中导电填料的含量较低时比较明显, 并 使其导电阀值从 5.6 %降至 3.0 %( 体积分数) .磁 致取向可以对复合材料的屏蔽效能进行优化 .通过 控制固化前体系的动力学黏度和磁场强度, 可以改 变磁致取向的时间. 参 考 文 献 [ 1] Li X, Wang H, Ren Z M , et al.Development of the st able high magnetic field technology and its application in materi al science. Mater Rev, 2002, 16( 10) :25 ( 李喜, 王晖, 任忠鸣, 等.稳恒强磁场技术的发展及其在材料 科学中的应用.材料导报, 2002, 16( 10) :25 [ 2] Uyeda C, Tanaka K, Takashima R, et al.Magnetic alignment at reduced field intensit y due to decrease of temperature observed for nonferromagnetic particles possessing paramagnetic and diamag￾netic anisotropy .J App l Phys, 2004, 43:980 [ 3] Rango P D, Lee M, Lejay P, et al.Texturing of magnetic mat e￾rials at high temperature by solidification in a magneti c field.Na￾tu re, 1991, 349:770 [ 4] Chhiu T L, Barry S , Mark K, et al.Nanograin magnet oresistive manganit e coatings f or EM I shielding against directed energy puls￾es.Prog Org Coa t, 2003, 47:190 [ 5] Wang H, Ren Z M , Deng K, et al.Effects of st atic magnetic field on solidification structu re of MnBi phase in semi-solidified Bi￾Mn alloy .Acta Metall Sin , 2002, 38( 1) :41 ( 王晖, 任忠鸣, 邓康, 等.磁场对 Bi-Mn 合金两相区中 MnBi 相凝固组织的影响.金属学报, 2002, 38( 1) :41) [ 6] Duan Y P, Liu S H, Guan H T, et al.Eff ects of high magnetic field on grain shape and electrical conductivit y of doped polyani￾line.Acta Chem S in, 2005, 63( 17) :1595 ( 段玉平, 刘顺华, 管洪涛, 等.强磁场作用对聚苯胺颗粒形貌 及电性能的影响.化学学报, 2005, 63( 17) :1595) [ 7] Zhang B W, Xie C S, Hu J H, et al.Magnetic-field-induced alignment of metal nanoparticles in polymer :experiments and molecular dynamics simulation.Chem J Ch in Uni v, 2005, 26 ( 11) :2131 ( 张邦文, 谢长生, 胡军辉, 等.金属纳米粒子在聚合物中的磁 致排列:实验及分子动力学模拟.高等学校化学学报, 2005, 26( 11) :2131) [ 8] Shen L, Zhang Z Y, Wang J J, et al.Electrical and thermal con￾ductivity of polymers loaded w ith conductive filler .Polymer Mater S ci Eng , 2006, 22( 4) :107 ( 沈烈, 张稚燕, 王家俊, 等.填充型聚合物基复合材料的导电 和导热性能.高分子材料科学与工程, 2006, 22( 4) :107) [ 9] Li H W, Huang W X, Guan D G, et al.Research of the w at er￾based Ni-based electromagnetic shielding coating .J F unct Mater Devices, 2004, 10( 1) :107 ( 李洪武, 黄婉霞, 管登高, 等.水性镍基电磁屏蔽涂料研究. 功能材料与器件学报, 2004, 10( 1) :107) [ 10] Zhang B W, Ren Z M, Wang H, et al.On dynamics of grain alignment during alloy solidification under applied magneti c field. Acta Meta ll Sin , 2004, 40( 6) :604 ( 张邦文, 任忠鸣, 王晖, 等.合金凝固过程中晶粒磁取向的动 力学研究.金属学报, 2004, 40( 6) :604 第 2 期 李 永等:磁致取向对镍粉填充丙烯酸酯复合涂层导电与屏蔽性能的影响 · 223 ·
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