Insight into the formation of a continuous sheath structure for the PS phase in tri-continuous PVDF/PS/HDPE blends
Insight into the formation of a continuous sheath structure for the PS phase in tri-continuous PVDF/PS/HDPE blends
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深入了解三连续 PVDF/PS/HDPE 共混物中 PS 相连续鞘结构的形成
DOI：
10.1039/c5ra22555h
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发表时间：
2016
期刊：
影响因子：
3.9
通讯作者：
Mingbo Yang
中科院分区：
文献类型：
--
作者：
Rui Dou;Shuanglin Li;Yan Shao;Bo Yin;Mingbo Yang
这项工作报告了 PVDF/PS/HDPE 共混物中三元渗滤共连续系统的形态发展，其中 PVDF 和 HDPE 形成两个连续网络，而 PS 在 PVDF/HDPE 界面处形成连续鞘结构。通过控制 PVDF、PS 和 HDPE 的相对量，基于重量溶剂萃取的连续性数据清楚地表明，低至 11% 的 PS 体积组成可带来约 80% 的极高连续性水平。通过改变 HDPE 和 PS 的成分比例，同时 PVDF 相浓度保持在恒定的 44% 体积分数，进一步研究了 PS 相连续性的演变。扫描电子显微镜和光学显微镜用于清楚地说明和识别 PS 相形态的演变。结果表明，随着PS相浓度的增加，三元共混物中PS相形态的演变经历了几个明显的阶段：当PS浓度小于4 vol%时，PS相以分散液滴形式位于PVDF和HDPE界面；当PS浓度增加到7vol%时，PS相在PVDF和HDPE之间形成不完整的界面；当 PS 浓度达到 10 vol% 时，大部分 PS 在 PVDF/HDPE 界面上清晰自发地结构化，形成均匀的层。此外，通过光学显微镜在线观察，分别研究了200℃静态退火下PS液滴的自组装行为和PS层在PVDF/HDPE界面上的聚结行为。退火下相形态演化的机制表明，相界面的运动和界面张力在相弛豫和平衡中起着关键作用。
This work reports on the morphology development of ternary percolated co-continuous systems in PVDF/PS/HDPE blends in which PVDF and HDPE form two continuous networks, while the PS forms a continuous sheath structure at the PVDF/HDPE interface. By controlling the relative amounts of PVDF, PS and HDPE, continuity data based on gravimetric solvent extraction clearly demonstrate that a PS volume composition as low as 11% results in a very high level of continuity of about 80%. The evolution of PS phase continuity is further studied by changing the component ratios of HDPE and PS with the PVDF phase concentration held at a constant 44% volume fraction. Scanning electron microscopy as well as optical microscopy is used to clearly illustrate and identify the evolution of the PS phase morphology. The results indicate that with a PS phase concentration increase, the evolution of the PS phase morphology in the ternary blends experiences several distinguished stages: when the PS concentration is less than 4 vol%, the PS phase locates at the PVDF and HDPE interface as dispersed droplets; when the PS concentration increases to 7 vol%, the PS phase forms an incomplete interface between PVDF and HDPE; when the PS concentration reaches 10 vol%, most of the PS has clearly and spontaneously structured itself at the PVDF/HDPE interface forming a uniform layer. Additionally, the self-assembly behavior of the PS droplets and the coalescence behavior of the PS layer on the PVDF/HDPE interface are respectively investigated through online observation using optical microscopy under quiescent annealing at 200 degrees C. The mechanism of the phase morphology evolution under annealing indicates that the movement of the phase interface and interfacial tension play key roles in the phase relaxation and equilibrium.
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DOI：
10.1002/polb.20733
发表时间：
2006-02
期刊：
Journal of Polymer Science Part B
影响因子：
--
作者：
Zhenhua Yuan;B. Favis
通讯作者：
Zhenhua Yuan;B. Favis
影响因子：
3.3
作者：
H. Gramespacher;J. Meissner
通讯作者：
H. Gramespacher;J. Meissner
影响因子：
4.6
作者：
H. Veenstra;J. Dam;A. P. D. Boer
通讯作者：
H. Veenstra;J. Dam;A. P. D. Boer
影响因子：
4.6
作者：
Luzinov, I;Pagnoulle, C;Jérôme, R
通讯作者：
Jérôme, R
影响因子：
41.2
作者：
Fialkowski, M;Bitner, A;Grzybowski, BA
通讯作者：
Grzybowski, BA