聚合物/蒙脱土剥离型纳米复合材料逾渗理论分析
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摘要
针对剥离型聚合物-蒙脱土纳米复合材料(PLSN),提出的临界基体层厚度增韧机制,以蒙脱土片层为单元,设片层的应力范围为球形,建立逾渗模型.得到PLSN的逾渗阈值为0.52,与聚合物基体、蒙脱土的成份、性质、粒子尺寸无关.对PLSN的增韧行为进行逾渗理论分析,并对剥离型环氧树脂/STAB-MMT纳米复合材料的增韧行为进行逾渗理论计算,得到其标度为0.19.说明了MMT片层在剥离型纳米复合材料中起到交联点的作用,具有增韧效应,其增韧行为符合逾渗理论.
Referring to critical matrix-thickness mechanism proposed by Wu Sou-heng,taking montmorillonite layer as a unit and assuming the stress-affected area as spherical,a percolation model of polymer-montmorillonite exfoliative nanocomposites(PLSN) was developed.The threshold of PLSN percolation obtained hence is 0.52,which is independent on the distribution of the content,properties and particles size of polymer and montmorillonite.Besides,the toughening mechanism of polymer-montmorillonite exfoliative nanocomposites was theoretically analyzed with percolation theory.And the toughening behavior of exfoliative epoxy-STAB-montmorillonite nanocomposites was also evaluated with percolation theory and found that the scale is 0.19.Which shows that exfoliative montmorillonite layers become cross-linking of nanocomposites and own toughening effection.The behavior of toughening corresponds with percolation theory.
Referring to critical matrix-thickness mechanism proposed by Wu Sou-heng,taking montmorillonite layer as a unit and assuming the stress-affected area as spherical,a percolation model of polymer-montmorillonite exfoliative nanocomposites(PLSN) was developed.The threshold of PLSN percolation obtained hence is 0.52,which is independent on the distribution of the content,properties and particles size of polymer and montmorillonite.Besides,the toughening mechanism of polymer-montmorillonite exfoliative nanocomposites was theoretically analyzed with percolation theory.And the toughening behavior of exfoliative epoxy-STAB-montmorillonite nanocomposites was also evaluated with percolation theory and found that the scale is 0.19.Which shows that exfoliative montmorillonite layers become cross-linking of nanocomposites and own toughening effection.The behavior of toughening corresponds with percolation theory.
引文
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[4]MILEIKO S T,STEPANOV A K.A percolation-type fracturecriterion for composites with randomly oriented fibres[J].Theoretical and Applied Fracture Mechanics,1997,28:95-108.
[5]UHAMMAD S.Linear and nonlinear,scalar and vector trans-port processes in heterogeneous media:Fractals,percolation,and scaling laws[J].The Chemical Engineering Journal,1996,64:21-24.
[6]罗延龄,王庚超,张志平.PTC特性的复合导电体系中炭粒子分布的逾渗模型与电阻率的计算[J].高分子通报,1998(4):23-33.
[7]RUNQING O,ROSARIO A,GERHARDT C M,et al.Assess-ment of percolation and homogeneity in ABS/carbon blackcomposites by electrical measurements[J].Composites(PartB),2003,34:607-614.
[8]JEON H S,RAMESHWARAM J K,KIM G.Characterizationof polyisoprene-clay nanocomposites prepared by solutionblending[J].Polymer,2003,44:5 749-5 758.
[9]XIE Xiaolin,ZHOU Xingping,TAN Jing,et al.Effect of maleicanhydride grafted SEBS on properties of polypropylene/carbonnanotube composites[J].合成橡胶工业,2002,25(1):46.
[10]黄锐,王旭,张玲,等.熔融共混法制备聚合物/纳米无机粒子复合材料[J].中国塑料,2003,17(4):20-23.
[11]彭静,乔金梁,魏根拴.橡胶增韧塑料机理[J].高分子通报,2001(5):13-24.
[12]王立新,张楷亮,任丽,等.聚合物/层状硅酸盐纳米复合材料的研究进展[J].复合材料学报,2001,18(3):5-9.
[13]陈国华,李明春,姚康德.聚合物/粘土纳米复合体系[J].高分子材料科学与工程,1999,15(3):9-13.
[14]OLSON B G,PENG Z L,McGervey J D,et al.Free volume inlayered organosilicate-polystyrene nanocomposites[J].Mate-rials Science Forum,1997,255-257:336-340.
[15]OKADA A,KAWASUMI M,USUKI A,et al.Nylon 6-clayhybrid[J].Res Soc Proc,1990,171:45-50.
[16]GILMAN J W,JACKSON C L,MORGAN A B,et al.Flam-mability properties of polymer-layered-silicate nanocompos-ites,polypropylene and polystyrene nanocomposites[J].Chem Mater,2000,12:1 866-1 873.
[17]陈光明,李强,漆宗能,等.聚合物/层状硅酸盐纳米复合材料研究进展[J].高分子通报,1999(4):1-10.
[18]GIANNELIS E P,KRISHNAMOORTI R,MANIAS E.Poly-mer-silica nanocomposites:modeled systems for confined poly-mers and polymer brushes[J].Advances in Polymer Science,1999,138:107-147.
[19]MARGOLINA A,WU Souheng.Percolation model for brittletough transition in polymer blends[J].Polymer,1988,29:2 170-2 173.
[20]WU Souheng,MARGOLINA A.Lett:reply to comments[J].Polymer,1990,31:972-974.
[21]吕建坤,柯毓才,漆宗能.环氧树脂/粘土纳米复合材料的制备与性能研究[J].复合材料学报,2002,19(1):117-121.
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