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首页> 外文期刊>RSC Advances >Thermomechanical analysis of picograms of polymers using a suspended microchannel cantilever
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Thermomechanical analysis of picograms of polymers using a suspended microchannel cantilever

机译：使用悬浮微通道悬臂的聚合物皮克的热力学分析

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摘要

Microchannel cantilevers are an emerging platform for physical characterization of materials at the picogram level. Here we report on detecting multiple thermal transitions in picogram amounts of two well-known polymers, semicrystalline poly(L-lactide) (PLA) and amorphous poly(methylmethacrylate) (PMMA), using this platform. The polymer samples, when loaded inside the cantilever, affect its resonance frequency due to changes in its total mass and stiffness. When taken through a thermal cycle, the resonance response of the cantilever further changes due to multiple thermal transitions of the samples. Continuous monitoring of the resonance frequency provides information about β-transition (Tβ), glass transition (Tg), crystallization (Tc), and melting (Tm) of the confined polymer samples. The measured Tg, Tc, and Tm for PLA were ～60, 78, and 154 °C, respectively, while the Tg and Tβ for PMMA were 48 and 100 °C, respectively. These results are in an agreement with the data obtained from differential scanning calorimetry (DSC). Because of its high sensitivity, this technique is capable of detecting the weaker β-transitions that cannot be observed with conventional DSC.
机译：微通道悬臂是新兴的平台，可用于在皮克级对材料进行物理表征。在这里，我们报告使用此平台检测两种已知聚合物的皮克数量的多个热转变，所述聚合物为半结晶聚（ L -丙交酯）（PLA）和无定形聚（甲基丙烯酸甲酯）（PMMA）。聚合物样品加载到悬臂内部时，由于其总质量和刚度的变化而影响其共振频率。当经过一个热循环时，由于样品的多次热转变，悬臂的共振响应进一步改变。连续监测共振频率可提供有关β转变（ T β ），玻璃化转变（ T < small> g ），结晶（ T c ）和熔化（ T m ）。测量的 T g ， T c ，和 T m 的PLA分别为约60、78和154°C，而 T < PMMA的small> g 和 T β 分别为48°C和100°C。这些结果与从差示扫描量热法（DSC）获得的数据一致。由于它的高灵敏度，该技术能够检测常规DSC无法观察到的较弱的β过渡。

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