Crystallization of hard segment domains with the presence of butane for microcellular thermoplastic polyurethane foams

被引:111
作者
Hossieny, Nemat J. [1 ]
Barzegari, Mohamad Reza [1 ]
Nofar, Mohammadreza [1 ]
Mahmood, Syed H. [1 ]
Park, Chul B. [1 ]
机构
[1] Univ Toronto, Dept Mech & Ind Engn, Microcellular Plast Mfg Lab, Toronto, ON M5S 3G8, Canada
关键词
Thermoplastic polyurethane; Microcellular foams; Crystallization; MULTIPLE ENDOTHERMIC BEHAVIOR; SURFACE-TENSION; MICROPHASE SEPARATION; MORPHOLOGICAL-CHANGES; EXTENSIONAL STRESSES; INFRARED TEMPERATURE; NANOCOMPOSITE FOAMS; BLOCK-COPOLYMERS; CELL NUCLEATION; POLYSTYRENE;
D O I
10.1016/j.polymer.2013.12.028
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
This paper presents the effects of dissolved butane on the crystallization of hard segment (HS) and its effects on enhancement of cell nucleation to manufacture microcellular thermoplastic polyurethane foams (TPU). The TPU samples were first reprocessed by melt compounding through a twin-screw extruder. A broad distribution of HS domains was-generated after this processing, including some perfected I-IS nano-crystals with a higher melting temperature. In addition to the processing effect, the saturation temperature and the plasticizing butane significantly induced a larger number of HS crystalline domains. Consequently, cell nucleation was significantly promoted in the vicinity of the largely distributed HS crystalline domains over a wider saturation temperature range of 150 degrees C-170 degrees C at a saturation pressure of 55 bar. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:651 / 662
页数:12
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