Thermographic Characterisation of the Deformation and Fracture Behaviour of Polymers with High Time and Spatial Resolution

Thermographic Characterisation of the Deformation and Fracture Behaviour of Polymers with High Time and Spatial Resolution
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高时间和空间分辨率聚合物变形和断裂行为的热成像表征

DOI:
10.1007/978-3-319-41879-7_4
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
Schneider
Schneider
中科院分区:
--
文献类型:
--
作者:
Schneider

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聚合物的热-力耦合描述了塑性变形过程中的耗散加热,这再次改变了局部分子的迁移率。以聚对苯二甲酸乙二酯(PET)和聚碳酸酯(PC)为例进行了研究。根据样品的几何形状,有一定量的储存弹性能可用于颈部启动,并伴随着样品的局部加热。在半晶态PET的情况下,可以观察到玻璃化转变温度(Tg)以上的温度跳跃,同时,PC的屈服温度在Tg以下显著增加。在裂纹萌生和断裂时,两种材料都可以检测到温度的进一步升高,对于PET接近晶相的熔融温度,对于PC在Tg以上。关于聚合物屈服和断裂与先前温度变化的讨论为相关的分子过程提供了新的线索。
The thermo-mechanical coupling of polymers describes the dissipative heating during plastic deformation, which again changes the local molecular mobility. It was investigated at the example of poly(ethylene terephthalate) (PET) and polycarbonate (PC). Depending on the sample geometry certain amount of stored elastic energy is available for neck initiation accompanied by local heating of the sample. In case of the semicrystalline PET temperature jumps until and above the glass transition temperature (Tg) can be observed, meanwhile the temperature increase at yield is significant belowTgfor PC. At crack initiation and fracture a further increase of the temperature is detectable for both materials, for PET close to the melting temperature of the crystalline phase and for PC aboveTg. The discussion of polymer yielding and fracture with respect to preceding temperature changes casts a new light on relevant molecular processes.
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