橡胶技术网

合成橡胶工业
CHINA SYNTHETIC RUBBER INDUSTRY
2006 Vol.29 No.6 P.439-444

橡胶技术网

纳米SiO2填充聚二甲基硅氧烷的微观结构在热贮存中的演变动力学

林桂  吴友平  钱燕超  张立群 

摘 要:分析了纳米SiO2填充聚二甲基硅氧烷(PDMS)复合体系在热贮存停放过程中微观结构的变化及其对动态性能的影响,提出了表征填料在橡胶基体中分散特征的方法,研究了填料聚集动力学及其机理.结果表明,纳米SiO2填充PDMS复合体系在低应变低频率下的动态储能模量(E′0)可以用来表征纳米无机粉体在橡胶基体中的分散特征,其测试条件为应变不大于0.70%,频率1 Hz;复合体系的E′0随着贮存停放时间的延长逐渐增大;当PDMS/SiO2(质量比)为100/100时,E′0恢复动力学的活化能约为3.01 kJ/mol;随着贮存停放时间的延长,复合体系中的纳米SiO2聚集更为稠密,结合胶含量增加并逐渐达到平衡;改性纳米SiO2填充PDMS复合体系的E′0在热贮存停放初期有小幅度的增大趋势,之后基本保持恒定.
关键词:纳米二氧化硅;聚二甲基硅氧烷;热贮存停放;微观结构;动态储能模量
分类号:TQ333.93  文献标识码:B

文章编号:1000-1255(2006)06-0439-06

Microstructure evolution kinetics of polydimethylsiloxane filled with nano-SiO2 composites during thermal annealing

Lin Gui  Wu Youping   Qian Yanchao   Zhang Liqun 

基金项目:国家自然科学基金资助项目(50303002);教育部博士点基金资助项目(20020010004);北京市自然科学基金重点资助项目(2031001).
作者简介:林桂(1977-),男,博士.已发表论文12篇.
作者单位:林桂(北京化工大学,北京市新型高分子材料制备与成型加工重点实验室,北京,100029;航天材料及工艺研究所密封与阻尼减震技术中心,北京,100076) 
     吴友平(北京化工大学,北京市新型高分子材料制备与成型加工重点实验室,北京,100029) 
     钱燕超(北京化工大学,北京市新型高分子材料制备与成型加工重点实验室,北京,100029) 
     张立群(北京化工大学,北京市新型高分子材料制备与成型加工重点实验室,北京,100029;北京化工大学,教育部纳米材料重点实验室,北京,100029) 

参考文献:

[1]Guido R.Application of the christensenlo model to the reinforcement of elastomers by fractal fillers[J].Macromol Theory Simul,2003,12(1):17 ~23
[2]Solomon M J,Almusallam A S,Seefeldt K F,et al.Rheology of polypropylene/clay hybrid materials[J].Macromolecules,2001,34(6):1 864~1 872
[3]Parice M,Sandrine M,David B.Reinforcement effects in fractalstructure-filled rubber[J].Polymer,2002,43(20):5 577 ~5 586
[4]Mirta I,Aranguren E M,Macosko C W.Compounding fumed silicas into polydimethylsiloxane:Bound rubber and final aggregate size[J].J Colloid Interface Sci,1997,195 (2),329 ~ 337
[5]Gerspacher M,Nikiel L,Yang H H,et al.Flocculation in carbon black filled rubber compounds[J].Kautschuk und Gummi Kunststoffe,2002,55 (11):596 ~ 604
[6]Schueler R,Petermann J U,Schulte K,et al.Agglomeration and electrical percolation behavior of carbon black dispersed in epoxy resin[J].J Appl Polym Sci,1997,63(13):1 741 ~ 1 746
[7]Flandin L,Prasse T,Schueler R,et al.Anomalous percolation transition in carbon black-epoxy composite materials[J].Phys Review (B):Condensed Matter and Matter Phys,1999,59 (22):14 349 ~ 14 355
[8]Eatah A I,Ghani A A,Hashem A A.Thermal aging dependence of electrical conductivity for butyl rubber (IIR) loaded with HAF carbon black[J].Polym Degra Stab,1989,26 (2):145 ~ 150
[9]Ghofraniha M,Salovey R.Electrical conductivity of polymers containing carbon black[J].Polym Eng Sci,1988,28(1):58 ~ 63
[10]Roland C M.Dynamic mechanical behavior of filled rubber at small strains[J].J Rheol,1990,34(1):25 ~ 34
[11]Wu G,Asai S,Sumita M,et al.Estimation of flocculation structure in filled polymer composites by dynamic rheological measurements[J].Colloid Polym Sci,2000,278 (3):220 ~ 228
[12]DeGroot J V,Macosko C W.Aging phenomena in silica-filled polydimethylsiloxane[J].J Colloid Interface Sci,1999,217 (1):86 ~ 93
[13]Yunyongwattanakorn J,Yasuyuki T,Seiichi K,et al.Effect of non-rubber components on storage hardening and gel formation of natural rubber during accelerated storage under various condition[J].Rubb Chem Technol,2003,76(5):1 228 ~ 1 240
[14]Hogg R.The role of polymer adsorption kinetics in flocculation[J].Colloids and Surfaces (A):Physicochemical and Engineering Aspects,1999,146 (1-3):253 ~ 263
[15]Schwartza G A,Silvina C,Marzoccaa A J,et al.Thermal aging of carbon black filled rubber compounds(Ⅰ):Experimental evidence for bridging flocculation[J].Polymer,2003,44 (23):7 229 ~ 7 240
[16]Leblanc J L,Hardy P.Evolution of bound rubber during the storage of uncured compounds[J].Kautschuk und Gummi Kunststoffe,1991,44(12):1 119 ~1 124

收稿日期:2005年8月1日

修稿日期:2006年7月31日

出版日期:2006年11月15日