Influence of structural organization on tensile properties in mesomorphic isotactic polypropylene
Influence of structural organization on tensile properties in mesomorphic isotactic polypropylene
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DOI：
10.1016/j.polymer.2009.06.050
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发表时间：
2009-07
期刊：
影响因子：
4.6
通讯作者：
K. Nitta;K. Odaka
中科院分区：
文献类型：
--
作者：
K. Nitta;K. Odaka
采用广角和小角X射线散射、流变光学和拉伸试验研究了热处理对介晶等规聚丙烯结构和力学性能的影响。利用Takayanagi模型估算了介晶相的杨氏模量为5GPa。通过退火淬火的介晶iPP制备的α-结晶iPP是透明的，因为没有球晶结构。结果表明，α-结晶iPP的机械屈服过程主要由结晶结构单元的塑性流动控制，而α-球晶iPP在80°C淬火时的屈服过程主要由结晶结构单元的断裂或碎裂引起。
The effects of annealing on the structure and mechanical properties of mesomorphic isotactic polypropylene have been investigated using wide-angle and small-angle X-ray scattering and rheo-optics in addition to tensile tests. Young's modulus of mesomorphic phase was estimated to be 5GPa using Takayanagi model. The α-crystallitic iPP prepared by annealing the quenched mesomorphic iPP was transparent because of the absence of spherulitic structure. It was found that the mechanical yielding of α-crystallitic iPP is dominated by the plastic flow of crystalline structural units whereas the yield process of α-spherulitic iPP quenched at 80°C is caused by the fracture or fragmentation of crystalline structural units.