反式丁戊橡胶改性航空轮胎侧胶的结构与性能

采用反式-1，4-丁二烯-异戊二烯共聚橡胶（简称反式丁戊橡胶，TBIR）改性航空轮胎侧胶[天然橡胶（NR）/顺丁橡胶（BR）（质量比80/20）]，研究了NR/BR/TBIR混炼胶的结晶行为、力学性能、硫化特性及硫化胶的物理机械性能、动态力学性能和填料分散性.结果表明，相比NR/BR并用胶，结晶性TBIR的并用赋予NR/BR/TBIR混炼胶较高的格林强度和杨氏模量.NR/BR/TBIR混炼胶工艺正硫化时间延长，交联密度提高.TBIR用量范围内，NR/BR/TBIR硫化胶300%定伸应力提高7%，耐屈挠疲劳性能提高35%~50%，滚动阻力降低.m（NR）/m（BR）/m（TBIR）为80/10/10硫化胶具有更好的综合力学性能及耐热氧老化性能.随着硫化时间的延长，NR/BR/TBIR（80/10/10）硫化胶较NR/BR（80/20）硫化胶100%定伸应力提高18%以上，NR/BR体系的耐屈挠疲劳性降低近60%，而NR/BR/TBIR（80/10/10）体系仍能保持原来的50%；反映滚动阻力的60℃损耗因子降低8%~14%，反映抗湿滑性的0℃损耗因子保持不变.填料分散度得到改善，填料聚集体尺寸降低.NR/BR/TBIR（80/10/10）硫化胶具有更好的耐长时间硫化的特性.

Structure and Properties of Sidewall Compounds for Aircraft Tyre Modified by TBIR

Trans-1,4-poly(butadiene-co-isoprene) copolymer rubber(TBIR) was used to modify nature rubber(NR)/butadiene rubber(BR) blends for sidewall compounds in aircraft tyre, and the crystalline behavior, mechanical properties and vulcanization characteristics of the NR/BR/TBIR compounds, physical and mechanical properties, dynamic mechanical properties and filler dispersion of the NR/BR/TBIR vulcanizates were studied in details. The results indicate that the incorporation of crystalline TBIR endows the NR/BR/TBIR compounds higher green strength and Young's modulus. Blending TBIR with NR/BR, the optimum curing time(t_c90) and the crosslinking density of the compounds increased. The NR/BR/TBIR[m(NR)/m(BR)/m(TBIR)=80/10/10, 80/0/20] vulcanizates with TBIR incorporation showed 7% higher of 300% modulus, 35%-50% higher of flexural fatigue resistance and reduced rolling resistance compared with NR/BR vulcanizate. NR/BR/TBIR(80/10/10) vulcanizate presented better comprehensive properties with improved thermo-oxidative ageing resistance. With the extension of curing time, modulus at 100% of NR/BR/TBIR(80/10/10) vulcanizate was above 18% higher than NR/BR(80/20) vulcanizate. Flexural fatigue resistance of NR/BR vulcanizate was reduced by 60%, while only 50% of NR/BR/TBIR(80/10/10) vulcanizate. The NR/BR/TBIR vulcanizate showed reduced rolling resistance(8%-14% lower) and unchanged wet skid resistance. The filler dispersion improved with reduced filler aggregate size. NR/BR/TBIR(80/10/10) vulcanizate had good resistance to the longer curing time.