热膨胀系数

Microwrinkles by deposition of aluminum onto polydimethylsiloxane

ty10086 提交于 周四, 08/26/2021 - 13:39
Abstract(#br)We observed the variation in the size of microwrinkles according to the number of unit processing cycles, which consist of polydimethyl siloxane (PDMS) casting followed by the deposition of Al. As the number of processing cycles increases, the width of the microwrinkles narrows and their height increases. After five processing cycles were completed, the width of the microwrinkles stood at 1.7–3.7\u003cce:hsp sp=\"0.25\"/\u003eμm.

Contact-free thermal expansion measurement of very soft elastomers using digital image correlation

ty10086 提交于 周四, 08/26/2021 - 13:27
Abstract(#br)The coefficient of thermal expansion (CTE) is a critical material property that represents the dimensional stability of a material under thermal loading. For soft materials such as elastomers, accurate measurement of the CTE is challenging due to the severe local deformation of the specimen in contact with the measuring apparatus. In this paper, a contact-free CTE measurement method is introduced for soft polymers using three-dimensional digital image correlation. The accuracy of the method was validated using various reference materials.

用碳纤维调节聚二甲基硅氧烷的热和力学性能

ty10086 提交于 周三, 08/25/2021 - 16:21
为了满足技术不断进步的需要,制备性能提高、行为可预测的材料变得至关重要。为此,我们制备了0、0.5、1.0、2.0和4.0 CF负载量( w / w )下填充纳米碳纤维( CFs )的聚二甲基硅氧烷( PDMS )聚合物样品,以考察和优化制备所需填充量,提高力学性能。采用简单、经济的机械混合方法将PDMS和CF填料结合制备样品,通过化学( FTIR )、机械(硬度和拉伸)、物理(溶胀、热重分析( TGA )、差示扫描量热( DSC )、热膨胀系数)等分析对样品进行表征,确定材料性能。我们发现,硬度和热稳定性可预见性提高,而极限强度和韧性均有所下降。反复拉伸使填充CF的PDMS样品随着CF载荷的增加而失去明显的韧性。PDMS中CF负载量为4wt . %时,其硬度和热降解温度较原始PDMS样品分别提高了40 %和25℃以上。此外,膨胀计测量显示,在PDMS中添加少量CF填料,热膨胀系数( CTE )下降了20 %。在本研究中,我们能够显示PDMS的力学和热学性能可以很好的调节信心使用CFs。

用碳纤维调节聚二甲基硅氧烷的热和力学性能。

ty10086 提交于 周三, 08/25/2021 - 16:21
为了满足技术不断进步的需要,制备性能提高、行为可预测的材料变得至关重要。为此,我们制备了0、0.5、1.0、2.0和4.0 CF负载量( w / w )下填充纳米碳纤维( CFs )的聚二甲基硅氧烷( PDMS )聚合物样品,以考察和优化制备所需填充量,提高力学性能。采用简单、经济的机械混合方法将PDMS和CF填料结合制备样品,通过化学( FTIR )、机械(硬度和拉伸)、物理(溶胀、热重分析( TGA )、差示扫描量热( DSC )、热膨胀系数)等分析对样品进行表征,确定材料性能。我们发现,硬度和热稳定性可预见性提高,而极限强度和韧性均有所下降。反复拉伸使填充CF的PDMS样品随着CF载荷的增加而失去明显的韧性。PDMS中CF负载量为4wt . %时,其硬度和热降解温度较原始PDMS样品分别提高了40 %和25℃以上。此外,膨胀计测量显示,在PDMS中添加少量CF填料,热膨胀系数( CTE )下降了20 %。在本研究中,我们能够显示PDMS的力学和热学性能可以很好的调节信心使用CFs。