TBIR对天然橡胶纳米复合材料结构和性能的调控

Regulation of TBIR on the Structure and Properties of Natural Rubber Based Nanocomposites

利用天然橡胶湿法胶(W-NR)与天然橡胶(NR)制备了NR/W-NR混炼胶,并进一步利用反式-1,4-丁二烯-异戊二烯共聚橡胶(TBIR)改性NR及NR/W-NR,构筑具有不同聚合物网络结构及填料网络结构的橡胶纳米复合材料.采用炭黑填料分散仪、差示扫描量热仪以及平衡溶胀法等研究了白炭黑填充NR和NR/W-NR,NR/TBIR及NR/W-NR/TBIR橡胶纳米复合材料的结构与性能.结果表明,与NR和NR/W-NR相比,TBIR的加入可在天然橡胶基体中构筑聚合物双网络结构(包括硫交联键和TBIR片晶物理交联点),提高了混炼胶的模量与格林强度,改善了填料分散性,进而提高填料-橡胶相互作用.分别相对于NR和NR/W-NR硫化胶,NR/TBIR(90/10)及NR/W-NR/TBIR(40/66.5/10)硫化胶的耐磨性及伸张疲劳性能提高,滚动阻力降低,耐老化性改善.其中,TBIR与湿法胶并用构筑的NR/W-NR/TBIR(40/66.5/10)硫化胶具有更低的滚动阻力及优异的综合性能.本文建立了一种简单有效调控天然橡胶纳米复合材料的填料网络结构与聚合物网络结构的方法,赋予了天然橡胶基复合材料优异的综合性能.

Trans-1,4-poly(butadiene-co-isoprene)copolymer rubber(TBIR)and wet mixing natural rubber master⁃batch(W-NR)were used to modify natural rubber(NR)nanocomposites with different polymer network structures and filler network structures.The structure and properties of NR,NR/W-NR,NR/TBIR and NR/W-NR/TBIR rubber nanocomposites were investigated by means of carbon black packing dispersion apparatus,differential scanning calorimetry and equilibrium swelling method,etc.Compared with NR and NR/W-NR vulcanizates,the addition of TBIR component constructed special polymer network structures including sulfide bonds and polymer crystals acting as physical crosslinks in the NR matrix,which improved the modulus and green strength of the NR matrix,provided better filler dispersion,and improved filler-rubber interactions.Therefore,compared with NR and NR/W-NR vulcanizates,the NR/TBIR(90/10)and NR/W-NR/TBIR(40/66.5/10)vulcanizates showed improved DIN abrasion resistance,enhanced tensile fatigue property,reduced rolling resistance,and better aging resistance.The NR/W-NR/TBIR(40/66.5/10)vulcanizate prepared by combining the advantages of W-NR and TBIR together presented much lower rolling resistance,as well as excellent comprehensive properties.This work provides a facial and effective regulation way to adjust the polymer network structure and filler network structure,and fabricate NR nanocomposites with excellent comprehensive properties.