充油SEBS的结构、力学性能和紫外辐照稳定性 |
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ꎮ 关键词 : 苯乙烯 - 乙烯 / 丁烯 - 苯乙烯三嵌段共聚物 ꎻ 橡胶填充油 ꎻ 微相结构 ꎻ 力学性能 ꎻ 紫外稳定性 中图分类号 : TQ325 2
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文章编号 : 1005-5770 ( 2021 ) 03-0101-05 doi : 10 3969 / j issn 1005-5770 2021 03 021 开放科学 ( 资源服务 ) 标识码 ( OSID ): Structure ꎬ Mechanical Properties and UV Stability of Oil ̄extended SEBS JI Xiang 1 ꎬ WU Rui 2 ꎬ LIU Jun ̄yi 2 ꎬ HU Bei ̄li 2 ꎬ LIU Yan 1 ꎬ LIN Jian ̄rong 1 ꎬ ZHANG Ai ̄min 2 ꎬ WU Jian ̄xun 2 ( 1. China National Offshore Oil Corporation ( Taizhou )ꎬ Taizhou 225300 ꎬ China ꎻ 2. State Key Laboratory of Polymer Materials Engineering ꎬ Polymer Research Institute ꎬ Sichuan University ꎬ Chengdu 610065 ꎬ China ) Abstract : An intermediate group of styrene ̄ethylene / butylene ̄styrene triblock copolymer ( SEBS ) elastomer filler oil was prepared. The relationship among the mechanical properties ꎬ UV radiation stability ꎬ and structure of linear SEBS and star SEBS was studied from the microphase structure and molecular structure. Small ̄angle X ̄ray scattering ( SAXS ) and transmission electron microscopy ( TEM ) were used to characterize the microstructure. It is revealed that the molecular structure of SEBS is the main factor that affects the microphase structure. The greater the electron density difference between the soft and hard segments ꎬ the PS phase size and phase spacing ꎬ the higher the degree of microphase separation of SEBS could be obtained. Combining with the test results of the Instron material testing machine ꎬ it is found that the high degree of SEBS microphase separation is beneficial to the improvement of the mechanical properties of the oil ̄extended system. Fourier transform infrared spectroscopy ( FTIR ) was used to study the chemical constitution changes of the system after the irradiation. The FTIR absorption peaks appear around 1 700 ~ 1 740 cm -1 ꎬ 1 800 cm -1 . The absorption peak intensity is large ꎬ and the mechanical properties decrease quickly ꎬ indicating that the unsaturated carbonyl group generated by oxidative degradation is the main factor that causes the decrease of the mechanical properties. Keywords : Styrene ̄ethylene ̄butylene ̄styrene Triblock Copolymer ꎻ Rubber Filling Oil ꎻ Microphase Structure ꎻ Mechanical Properties ꎻ Ultraviolet Stability 由于兼具热塑性塑料的可重复加工性和传统硫化 橡胶的高弹性 ꎬ 热塑性弹性体已经广泛应用于国民经 济的诸多领域 ꎮ 其中 ꎬ 苯乙烯 - 乙烯 / 丁烯 - 苯乙烯三 嵌段共聚物 ( SEBS ) 作为一种多用途的新型热塑性 弹性体 ꎬ 是由苯乙烯 - 丁二烯 - 苯乙烯三嵌段共聚物 ( SBS ) 高度加氢制得 [ 1 ] ꎮ 不饱和双键经催化加氢后 ꎬ 其耐 臭 氧 、 耐 候 、 耐 热 性 得 到 大 幅 度 的 提 高 [ 2 ] ꎮ SEBS 性能优异且成本较低 ꎬ 广泛应用于胶黏剂 、 密 封材料 、 制鞋业 、 高聚物改性 、 医疗器械 、 电线电缆 等领域 [ 3 ] ꎮ 纯 SEBS 弹性体熔体黏度大难以加工 [ 4 ] ꎬ 需加入 填充油和聚丙烯 ( PP ) 进行增塑改性 ꎬ 同时调节性 能并降低成本 [ 5 ] ꎮ 目前 ꎬ 国内外研究人员关于填充 油种类 [ 6 ] 、 用量 [ 7 ] 、 SEBS 结构 [ 8 ] 等对充油 SEBS 体 1 0 1 |
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