1.2.5 表面改性
(1)表面化学改性 表面化学改性是指通过反应剂与材料表面发生化学反应,使材料表面在化学结构上发生改变,从而达到提高材料某些性能的目的。橡胶表面化学改性时所发生的化学反应很复杂,涉及取代、置换和环化反应等。改性手段主要有表面卤化、表面磺化、表面氧化、共价功能化等。
(2)表面物理改性 表面物理改性是通过各种物理技术对橡胶表面进行改性的一种方法。用于橡胶表面改性的物理技术包括火焰处理、电晕处理、冷等离子与热等离子处理、紫外线处理、激光处理、X射线与γ射线处理、电子束处理、离子束处理、金属化以及喷涂处理等。
(3)表面涂层 表面涂层是指在不改变橡胶表面性质的基础上,在其上覆盖一层具有特殊功能的物质。形成这些涂层的方法多种多样,有加热沉积法、配成涂料涂覆法、溶液浸涂法、静电喷涂法和媒介法等。
(4)等离子技术 等离子体是由高能离子(电子、正负离子、中性粒子)和紫外线组成的。利用等离子体进行橡胶表面改性的方法通常分成等离子体处理、等离子体聚合和等离子体接枝聚合。
等离子体材料表面改性可以使材料表面产生一系列物理与化学变化,或产生刻蚀而粗糙,或形成致密的交联层,或引入含氧极性基团,使亲水性、黏结性、可染性、生物相容性及电性能分别得到改善,而材料基体性能几乎不受影响。
材料大多是通过表面与环境相互作用的。在实际应用中,橡胶的表面性能涉及生物相容性、黏合性、耐磨性和耐老化性等诸多性能,若想更好地发挥橡胶的表面性能,除了需要对橡胶表面化学特性、表面能、润湿性、界面相互作用等问题进行研究外,还需要从橡胶表面分子的微观结构入手,不断探索新的改性手段,从而达到适应不同环境的目的。
今后橡胶改性的发展趋势主要是综合利用多种改性技术,使改性品种向系列化和高性能化发展,改性工艺趋向于高效、节能、环保与低成本。橡胶改性技术仍将是技术开发的热点之一,更是开发具有崭新性能新型材料的重要途径。
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