Unexpected foaming behavior of heterografted comb-like PS-g-(PS/PE) copolymers with high branching density at semi-solid state under CO2 batching foam
Unexpected foaming behavior of heterografted comb-like PS-g-(PS/PE) copolymers with high branching density at semi-solid state under CO2 batching foam
复制标题
CO2配料泡沫下半固态高支化密度异质接枝梳状PS-g-(PS/PE)共聚物的意外发泡行为
DOI：
10.1016/j.polymer.2018.05.050
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发表时间：
2018-06
期刊：
影响因子：
4.6
通讯作者：
Li Minggang
中科院分区：
文献类型：
--
作者：
Zhang Shaofeng;Lin Yichao;Ye Lin;Gu Yang;Qiu Jian;Tang Tao;Li Minggang
研究了以聚苯乙烯（PS）和半晶聚乙烯（PE）为支链，以聚苯乙烯（PS）和半晶聚乙烯（PE）为主链的高支链异接枝梳状共聚物（PS-g-(PS/PE)）的co2分批发泡行为。重点研究了发泡温度对PS-g-(PS/PE)共聚物co2分批发泡行为的影响。在相同的饱和压力和饱和时间下（co2压力：13.3 MPa，饱和时间：5.5 h），随着发泡温度（50-110 ℃）的变化，试样的状态从固态到半固态再到熔融状态，从而产生不同的发泡行为。当发泡温度低于50 ℃时，所有样品（固态）均不形成泡沫或多孔结构。在60 °C以上，样品的发泡行为与发泡温度密切相关。令人惊讶的是，在60 °C时，具有层状微相结构的PS-g-(PS/PE)共聚物容易形成由纳米纤维组成的双峰孔结构（开孔孔），而具有柱状微相结构的PS-g-(PS/PE)共聚物也容易形成尺寸较大的双峰孔结构，但细胞壁的开放程度降低，其中纳米纤维几乎消失，出现了大量纳米结构域。当发泡温度高于70 ℃时，随着发泡温度的升高，晶胞尺寸增大，晶胞密度减小。当发泡温度升高时，泡孔结构由开口（多孔）结构变为封闭结构，这与以往报道的结果不同。讨论了发泡温度对PS-g-(PS/PE)共聚物发泡性能的影响。
The CO2batching foaming behavior of heterografted comb copolymers (PS-g-(PS/PE)) with high branching density, which consisted of mixed polystyrene (PS) and semicrystalline polyethylene (PE) branching chains linked to PS backbone, were explored. Especially the effect of foaming temperature on CO2batching foaming behavior of PS-g-(PS/PE) copolymers was deeply studied. Under the same saturation pressure and time (CO2pressure: 13.3 MPa; saturation time: 5.5 h), the state of the samples changed with the foaming temperature (50–110 °C) from solid state to semi-solid state and finally melt state, resulting in different foaming behavior. When the foaming temperature was lower than 50 °C, all the samples (solid state) did not form foamed or porous structures. At above 60 °C, the foaming behavior of the samples strongly depended on the foaming temperature. Very surprisingly, at 60 °C, PS-g-(PS/PE) copolymers with lamellar microphase structure easily formed bimodal nanoporous structure (open-cell) composed of nanofibers, while PS-g-(PS/PE) copolymers with cylindric microphase structure also formed bimodal porous structure with larger size, but the open degree of cell wall was decreased, in which the nanofibers almost disappeared and a lot of nanosized domains appeared. When the foaming temperature was higher than 70 °C, the cell size increased and the cell density decreased with increasing foaming temperature. Furthermore, the cell structure changed from opened (porous) structure to closed structure when the foaming temperature rose, which was different from the results in the previous reports. The influence of foaming temperature on the foaming behavior of PS-g-(PS/PE) copolymers was discussed.
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影响因子：
4.6
作者：
Wang Lu;Yang Hongfan;Tan Haiying;Yao Kun;Gong Jiang;Wan Dong;Qiu Jian;Tang Tao
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DOI：
10.1016/j.msec.2006.06.028
发表时间：
2007-09
期刊：
Materials Science and Engineering: C
影响因子：
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作者：
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通讯作者：
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影响因子：
5.5
作者：
Krause, B;Sijbesma, HJP;Wessling, M
通讯作者：
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影响因子：
4.6
作者：
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通讯作者：
G. L. Chakkalakal;C. Abetz;U. Vainio;U. A. Handge;V. Abetz
DOI：
10.1016/0923-0467(93)85007-i
发表时间：
1993-12
期刊：
The Chemical Engineering Journal and The Biochemical Engineering Journal
影响因子：
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作者：
C. Buckley
通讯作者：
C. Buckley