双(2-柠康酰亚胺苯基)二硫化物对天然橡胶性能的影响

采用双(2-柠康酰亚胺苯基)二硫化物(BCoPD)作为天然橡胶(NR)的多功能硫化助剂,通过机械共混制备BCoPD/NR复合材料,探讨BCoPD用量和复合材料制备方法对BCoPD/NR复合材料的门尼粘度、Payne效应、硫化特性、交联键分布、物理性能和动态力学性能的影响。结果表明:采用在生胶塑解过程中加入BCoPD的BCoPD/NR复合材料制备方法,加入0.5份BCoPD使得复合材料的门尼粘度下降22.2%,60 min时的抗硫化返原率减小3%,多硫键比例增大3%,物理性能小幅下降,抗湿滑性能小幅提高;采用在加硫化体系时加入BCoPD的BCoPD/NR复合材料制备方法,加入1份BCoPD使得复合材料60 min时的抗硫化返原率下降11.9%,多硫键比例增大4%,物理性能有所提高,滚动阻力小幅下降。

Interface and Surface Properties of Nano-hydroxyapatite /Poly (1,4-PhenyleneSulfide)-Poly(2,4-Phenylene Sulfide Acid) Copolymer Composite

The interface and surface properties of nano-hydroxyapatite(n-HA) and poly(1,4-phenylene sulfide)-poly (2,4-phenylene sulfide acid)(PPS-PPSA) copolymer composite were investigated. The results show that there are some strong interface combinations of calcium ion (Ca2+), carboxyl (-COO-) and phosphate radicle ion (PO3-4) between copolymer and n-HA in the composite. The presence of the 2,4-phenylene sulfide acid in copolymer can increase the affinity to n-HA, which causes the formation of chemical bindings between the PPS-PPSA copolymer and n-HA. XRD analysis and IR surface analysis indicate that n-HA is not encapsulated by copolymer but exposed on the surface of the composite, and has same structure and properties with the original n-HA. The presence of the interface chemical bindings between the PPS-PPSA copolymer and n-HA can increase the content of n-HA in composite but does not cause the decrease of the composite mechanical strength.