Large strain cavitation induced stress whitening in propylene-butene-1 copolymer during stretching
Large strain cavitation induced stress whitening in propylene-butene-1 copolymer during stretching
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拉伸过程中丙烯-丁烯-1 共聚物中大应变空化引起的应力致白
DOI：
10.1016/j.polymer.2019.01.081
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发表时间：
2019-03
期刊：
影响因子：
4.6
通讯作者：
Men Yongfeng
中科院分区：
文献类型：
--
作者：
Lyu Dong;Tang Yujing;Qian Li;Chen Ran;Lu Ying;Men Yongfeng
利用超小角x射线散射技术观察了丙烯-丁烯-1共聚物在拉伸过程中大应变空化引起的应力增白现象。引起这种空化的临界应力取决于拉伸温度（Ts）。在125 °C以下发现恒定的临界应力，而在125 °C以上应力开始增加。丙烯-丁烯-1共聚物中这种特殊的空化性能被认为与变形前不稳定晶的熔化有关。这种不稳定的晶体通常由具有共基或短长度的链组成。在变白前的应变下，当共聚物在125 °C以下拉伸时，这些熔融晶体中的链可以完全重新结晶为取向晶体，而当样品在125 °C以上变形时，它们仍保持熔融状态。因此，共聚物在125 °C以下和高于125°C时产生了不同的高取向非晶网络，导致大应变空化的临界应力不同，因为这种空化是由这种取向非晶网络的断裂决定的。
Large strain cavitation induced stress whitening was observed in propylene-butene-1 copolymer during stretching by means of ultra-small angle X-ray scattering technique. The critical stress for initiating this cavitation depended on the stretching temperature (Ts). A constant critical stress was found belowTsof 125 °C while the stress started to increase above 125 °C. This peculiar cavitation performance presented in propylene-butene-1 copolymer was supposed to be associated with the melting of unstable crystallites before deformation. Such unstable crystallites were normally composed of chains with co-units or short length. At the strain just before whitening, chains from those melted crystallites could recrystallize wholly into oriented crystallites as the copolymer was stretched below 125 °C while they remained molten when the sample was deformed above 125 °C. Thus, different highly oriented amorphous networks were created below and above 125 °C in copolymer, resulting in different critical stresses for large strain cavitation since this cavitation is determined by the fracture of such oriented amorphous network.
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影响因子：
4.6
作者：
Y. Tanabe;G. Strobl;E. W. Fischer
通讯作者：
Y. Tanabe;G. Strobl;E. W. Fischer
影响因子：
3
作者：
Jinhai Yang;James L White
通讯作者：
Jinhai Yang;James L White
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影响因子：
4.3
作者：
Sun, Ying-ying;Chen, Ran;Li, Xiu-hong;Men, Yong-feng
通讯作者：
Men, Yong-feng
影响因子：
8.6
作者：
Men, YF;Rieger, J;Strobl, G
通讯作者：
Strobl, G
影响因子：
4.4
作者：
Housmans, Jan-Willem;Peters, Gerrit W. M.;Meijer, Han E. H.
通讯作者：
Meijer, Han E. H.