淀粉/SBR复合材料的吸水性对力学性能的影响

研究了淀粉／SBR复合材料以及淀粉／炭黑／SBR复合材料常温下浸水90d时吸水率和静态力学性能的变化，研究结果表明：淀粉用量增加，复合材料的吸水率增加；含20份淀粉的淀粉／SBR复合材料以及淀粉／炭黑／SBR复合材料在常温下浸水90d后，吸水率分别为8．5％和7．5％；淀粉的用量在20份范围内，随着材料浸水时间的延长，淀粉／炭黑／SBR复合材料的力学性能与纯SBR硫化胶和炭黑／SBR复合材料力学性能变化的趋势一致。材料的力学性能浸水30d内有所波动，当浸水至90d时，与未浸水时的相差不大。

Effect of Water Swelling on Mechanical Properties of Starch/SBR Composites

The water swelling and the mechanical properties of starch/SBR and starch/carbon black/SBR composites after 90-day water immersion at the room temperature were investigated. The results showed that the water swelling of composites increased with increasing starch loading. After 90-day water immersion at the room temperature, the weight increase of the starch/SBR composites and starch/carbon black/SBR composites containing 20 phr starch was 8.5% and 7.5%, respectively. In the range of 20 phr starch, during 90-day water immersion, the mechanical properties of starch/ carbon black/SBR composites, pure SBR vulcanizate and carbon black/SBR composites exhibited the similar change trend with increasing time of water immersion. The mechanical properties of starch/ carbon black/SBR composites fluctuated within 30-day water immersion; while after 90-day water immersion, the mechanical properties of the composites were almost the same as those before water immersion.