On the unexpected non-monotonic profile of specific volume observed in PCL/CO2 solutions
On the unexpected non-monotonic profile of specific volume observed in PCL/CO2 solutions
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DOI：
10.1016/j.polymer.2014.11.030
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发表时间：
2015-01-15
期刊：
影响因子：
4.6
通讯作者：
Mensitieri, Giuseppe
中科院分区：
文献类型：
--
作者：
Carbone, Maria Giovanna Pastore;Di Maio, Ernesto;Mensitieri, Giuseppe
最近，聚己内酯和二氧化碳（PCL/CO2）的熔融溶液的特定体积通过耦合重量测量与悬垂液滴的溶胀的观察来测量。非常有趣的是，这种方法突出了溶液的比容对CO2压力的非单调依赖性。在此，为了得到一个分子的洞察到这个实验发现，拉曼光谱已被采用到PCL/CO2溶液在几个压力下的调查。该研究表明，由于CO2和PCL的相互作用，可以在溶液中发现聚合物缔合和非缔合的CO2物质。此外，依赖于气体压力的CO2协会已被分析和调用的讨论的非单调演化的特定体积与CO2压力的增加。(C)2014爱思唯尔有限公司版权所有。
Recently, the specific volume of molten solutions of polycaprolactone and carbon dioxide (PCL/CO2) was measured by coupling gravimetric measurements with the observation of the swelling of a pendant drop. Quite interestingly, this approach highlighted a non-monotonic dependence of the specific volume of the solution on CO2 pressure. Herein, in order to get a molecular insight into this experimental finding, Raman spectroscopy has been adopted for the investigation into PCL/CO2 solutions at several pressures. This investigation has shown that due to the interactions of CO2 and PCL - polymer-associated and non-associated CO2 species can be found in the solution. Furthermore, the dependence of CO2 association on gas pressure has been analysed and invoked for the discussion of the non-monotonic evolution of the specific volume with increasing CO2 pressure. (C) 2014 Elsevier Ltd. All rights reserved.