| 闫海阔,郑晓平,王璠,包锦标,王市伟.利用超临界CO2调控聚合物二元共混物的相形貌及力学性能[J].材料导报,2018,32(12):2057-2061 |
| 利用超临界CO2调控聚合物二元共混物的相形貌及力学性能 |
| Adjusting Phase Morphology and Mechanical Properties of the Polymer Binary Blends by Supercritical CO2 |
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| DOI：10.11896/j.issn.1005-023X.2018.12.022 |
| 中文关键词: 聚丙烯 三元乙丙橡胶(EPDM) 超临界 二氧化碳退火 相形貌 力学性能 |
| 英文关键词: polypropylene, ethylene-propylene-diene monomer (EPDM), supercritical, CO2 annealing, phase morphology, mechanical property |
| 基金项目:国家自然科学基金(21306090);宁波大学王宽诚幸福基金；宁波市自然科学基金(2017A610045) |
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| 中文摘要: |
| 共混物的相态结构在很大程度上决定了共混物的物理性质。本工作以超临界CO2为溶剂,通过改变工艺来调控聚丙烯(PP)/三元乙丙橡胶(EPDM)共混物的相形貌,进而利用动态力学分析(DMA)仪研究其力学行为。结果表明,利用CO2在PP和EPDM基体中较大的溶解度和溶胀度差异,在CO2环境下退火处理PP/EPDM,可以显著增加EPDM相体积分数,进而促使EPDM相形貌从海-岛状结构向双连续结构转变。力学性能测试结果表明,在相同EPDM含量下,真空热退火后材料性能并没有发生显著变化,而经过CO2退火后材料的储能模量和损耗模量均有提高,这意味着材料的刚性和韧性都得到提升。 |
| 英文摘要: |
| The dominating influence of phase morphology onto the final properties of polymer blends is proverbial. We herein employed supercritical carbon dioxide (CO2) as the solution to adjust the phase morphology of polypropy-lene (PP)/ethylene-propy-lene-diene monomer (EPDM) blends, whose mechanical behavior was studied by using dynamic mechanical analysis (DMA). The results showed that the CO2 treatment, owing to the carbon dioxide’s solubility difference and swelling ratio difference in PP and EPDM matrices, could causes substantial increment of EPDM volume fraction, and in consequence, facilitates the transition of EPDM phase morphology in the polymer blends from an original sea-island structure to a co-continuous structure. The DMA test observed an inconspicuous performance change of the vacuum annealed blending material but definite storage modulus and loss modulus improvements of the supercritical CO2 annealed PP/EPDM blends with the same EPDM content, indicating the promotion of both toughness and inflexibility. |
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