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Polyhedral Oligomeric Silsesquioxane Induced Thermomechanical Reinforcement in Polymer Films Using Only Parts‐per‐Million Content
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-08-17 , DOI: 10.1002/mame.202000354 Angel Romo‐Uribe 1 , Joseph D. Lichtenhan 2
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-08-17 , DOI: 10.1002/mame.202000354 Angel Romo‐Uribe 1 , Joseph D. Lichtenhan 2
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Reinforcement of polymers by nanoparticles has been a challenge due to aggregation and solubility limits, especially at high loads. In this research, a robust and environmentally friendly fabrication approach to produce films reinforced with only parts‐per‐million (ppm) octamethyl‐polyhedral oligomeric silsesquioxane (mePOSS) using conventional extrusion and blow molding processing is demonstrated. The nanocomposites exhibit enhanced thermomechanical properties, and only 160 ppm mePOSS increase the tensile mechanical modulus, E, by ≈120% relative to the neat polymer. Remarkably, there is no penalty on strain at fracture εf, as usually seen in reinforced (nano) composites. Toughness, yield stress, tear, and puncture resistance are also an increasing function of mePOSS content. Furthermore, mePOSS also increase the thermal decomposition temperature and melting temperature. The placement of mePOSS in the molecular web is key to the thermal and mechanical reinforcement and these properties maximize when the nanoparticle size 〈D〉 matches the tube diameter dt, i.e., 〈D〉/dt ≈ 1. This simple fabrication approach combined with ppm POSS content and tunability of physical properties afforded by the location of POSS in the entangled web offers a new paradigm for the bottom‐up design of tunable lightweight polymer nanocomposites with superior thermomechanical and transport properties.
中文翻译：
多面体低聚倍半硅氧烷仅使用百万分之几的含量即可引起聚合物薄膜的热机械增强
由于聚集和溶解度的限制，特别是在高负荷下，纳米颗粒对聚合物的增强一直是一个挑战。在这项研究中，展示了一种可靠且环保的制造方法，该方法使用常规挤出和吹塑工艺生产仅用百万分之几（ppm）八甲基-多面体低聚倍半硅氧烷（mePOSS）增强的薄膜。纳米复合材料表现出增强的热机械性能，并且相对于纯聚合物，仅160 ppm mePOSS可使拉伸机械模量E增加≈120％。值得注意的是，在断裂εf处应变没有损失，通常在增强（纳米）复合材料中看到。韧性，屈服应力，抗撕裂性和抗穿刺性也是mePOSS含量的增加函数。此外，mePOSS还提高了热分解温度和熔融温度。mePOSS在分子网中的位置是热和机械增强的关键，当纳米粒子尺寸< D >与管径d t匹配时，即< D > / d t ≈1.这种简单的制造方法结合了ppm POSS含量和POSS在缠结网中的位置所提供的物理性能的可调节性，为可调节的轻质聚合物纳米复合材料的自下而上设计提供了新的范例，该纳米复合材料具有出色的热机械和运输性能。
更新日期：2020-10-12
中文翻译：
多面体低聚倍半硅氧烷仅使用百万分之几的含量即可引起聚合物薄膜的热机械增强
由于聚集和溶解度的限制，特别是在高负荷下，纳米颗粒对聚合物的增强一直是一个挑战。在这项研究中，展示了一种可靠且环保的制造方法，该方法使用常规挤出和吹塑工艺生产仅用百万分之几（ppm）八甲基-多面体低聚倍半硅氧烷（mePOSS）增强的薄膜。纳米复合材料表现出增强的热机械性能，并且相对于纯聚合物，仅160 ppm mePOSS可使拉伸机械模量E增加≈120％。值得注意的是，在断裂εf处应变没有损失，通常在增强（纳米）复合材料中看到。韧性，屈服应力，抗撕裂性和抗穿刺性也是mePOSS含量的增加函数。此外，mePOSS还提高了热分解温度和熔融温度。mePOSS在分子网中的位置是热和机械增强的关键，当纳米粒子尺寸< D >与管径d t匹配时，即< D > / d t ≈1.这种简单的制造方法结合了ppm POSS含量和POSS在缠结网中的位置所提供的物理性能的可调节性，为可调节的轻质聚合物纳米复合材料的自下而上设计提供了新的范例，该纳米复合材料具有出色的热机械和运输性能。
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