Disentanglement decelerating flow-induced nucleation
Disentanglement decelerating flow-induced nucleation
复制标题
解缠结减速流动诱导成核
DOI：
10.1016/j.polymer.2012.11.074
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发表时间：
2013-01
期刊：
影响因子：
4.6
通讯作者：
Feng Tian
中科院分区：
文献类型：
--
作者：
Nan Tian;Dong Liu;Yanping Liu;Lingpu Meng;Xiangyang Li;Jie He;Liangbin Li;Xiuhong Li;Feng Tian
以聚丁烯、等规聚丙烯和共规聚丙烯三种聚合物为模型体系，利用自制的微型拉伸流变仪和原位x射线散射研究了拉伸应变对成核速率的影响。在流变屈服点附近观察到成核速率与应变之间的非单调相关关系。当应变小于屈服应变时，增大应变导致成核率增加，而当应变略大于屈服应变时，增大应变导致成核率下降。我们提出解缠结发生在屈服点，从而减缓流动诱导成核。解缠结为链的收缩提供了自由，并导致最初由拉伸流施加的能量的耗散，从而减弱了流场对增强成核的作用。
With three polymers (poly(1-butene), isotactic polypropylene and syndiotactic polypropylene) as model systems, the effect of extensional strain on the nucleation rate was studied using a home-made miniature extensional rheometer and in-situ X-ray scattering. A non-monotonic correlation between nucleation rate and strain is observed around rheological yield point. Increasing strain leads to an increase in nucleation rate as expected when strain is smaller than yield strain, however, it results in a decrease in nucleation rate when strain slightly exceeds yield. We proposed that disentanglement occurs at yield point and thus decelerates flow-induced nucleation. Disentanglement provides freedom for chains to retract and leads to a dissipation of the energy initially imposed by extensional flow, which consequently weakens the effect of flow field on the enhancement of nucleation.
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影响因子：
8.6
作者：
Keesha A. Hayes;Mark R. Buckley;I. Cohen;L. Archer
通讯作者：
Keesha A. Hayes;Mark R. Buckley;I. Cohen;L. Archer
影响因子：
6
作者：
Fengyuan Yu;Hongbin Zhang;R. Liao;Hong Zheng;Wei Yu;Chi-xing Zhou
通讯作者：
Fengyuan Yu;Hongbin Zhang;R. Liao;Hong Zheng;Wei Yu;Chi-xing Zhou
影响因子：
5.5
作者：
Xuping Sun;Huizhen Li;Xianzheng Zhang;Jingxia Wang;Dujing Wang;Shouke Yan
通讯作者：
Xuping Sun;Huizhen Li;Xianzheng Zhang;Jingxia Wang;Dujing Wang;Shouke Yan
DOI：
10.1140/epje/i2004-10046-8
发表时间：
2004-10
期刊：
The European Physical Journal E
影响因子：
--
作者：
H. Huo;Y. Meng;Hong-fei Li;Shichun Jiang;L. An
通讯作者：
H. Huo;Y. Meng;Hong-fei Li;Shichun Jiang;L. An
影响因子：
3.2
作者：
C. Deng;Xueqin Gao;Zhanchun Chen;Shan Xue;K. Shen
通讯作者：
C. Deng;Xueqin Gao;Zhanchun Chen;Shan Xue;K. Shen