Co-aggregation process of poly(ethylene oxide)-b-polybutadiene/poly(acrylic acid) based on evolution of interpolymer hydrogen bonding in solutions
Co-aggregation process of poly(ethylene oxide)-b-polybutadiene/poly(acrylic acid) based on evolution of interpolymer hydrogen bonding in solutions
复制标题
基于溶液中互聚物氢键演化的聚环氧乙烷-b-聚丁二烯/聚丙烯酸共聚集过程
DOI：
10.1016/j.polymer.2008.03.015
复制
发表时间：
2008-04
期刊：
影响因子：
4.6
通讯作者：
中科院分区：
文献类型：
--
作者：
研究了两嵌段共聚物聚氧化乙烯-嵌段聚丁二烯（PEO-b-PB）和均聚物聚丙烯酸（PAA）在溶液中的共聚集过程。PEO和PB嵌段的数均分子量均为5100 g/mol; PAA的重均分子量为102000 g/mol。通过加入PB选择性溶剂（即，烷烃或环烷烃）加入到两种聚合物的THF溶液中，其过程通过浊度、1H NMR、动态光散射和显微镜实验表征。在选择性溶剂滴定过程中，溶液发生了以PAA为主的宏观相分离，随后发生了以PB嵌段为壳、PAA/PEO复合物为核的微相分离。实验结果表明，PAA和PEO嵌段间的氢键络合作用决定了共聚集过程。在相当低的选择性溶剂含量（f）下，可以形成松散且可溶的互聚物复合物。的络合增强与增加f，导致在“再溶解”的PAA丰富的域的共混物溶液。随后，与可溶性PB嵌段化学连接的更紧密的PAA/PEO复合物作为构建块在较高f.
The co-aggregation process of a diblock copolymer poly(ethylene oxide)-block-polybutadiene (PEO-b-PB) and a homopolymer poly(acrylic acid) (PAA) in solutions was studied. The number-average molecular weights of both the PEO and PB blocks are 5100g/mol; the weight-average molecular weight of PAA is ∼2000g/mol. The co-aggregation was induced by adding a PB selective solvent (i.e., alkane or cycloalkane) into the THF solution of the two polymers, with the processes characterized by turbidity,1H NMR, dynamic light scattering, and microscopy experiments. During the selective solvent titration, the solution underwent a macro-phase separation that was mainly related to PAA, followed by a micro-phase separation that corresponded to the formation of vesicles with the shell of PB block and the core of PAA/PEO complex. The experimental results indicated that the evolution of interpolymer hydrogen bonding complexation between the PAA and PEO blocks determined the co-aggregation process. The loose and soluble interpolymer complex could be formed at rather low selective solvent content (f). The complexation was enhanced with increasing f, resulting in “redissolving” the PAA-rich domains in the blend solutions. Afterwards, the more compact PAA/PEO complex chemically linked with a soluble PB block acted as the building blocks to form the vesicles at higher f.
登录
查看更多内容
影响因子：
29.4
作者：
K. Nielsch;F. Müller;An‐Ping Li;U. Gösele
通讯作者：
K. Nielsch;F. Müller;An‐Ping Li;U. Gösele
影响因子：
5.5
作者：
Cui, Honggang;Chen, Zhiyun;Pochan, Darrin J.
通讯作者：
Pochan, Darrin J.
DOI：
10.1002/(sici)1099-0488(19990701)37:13
发表时间：
1999-07
期刊：
Journal of Polymer Science Part B
影响因子：
--
作者：
S. Kwak;Soo Gyung Jung;Youngyo Yoon;Daewoo Ihm
通讯作者：
S. Kwak;Soo Gyung Jung;Youngyo Yoon;Daewoo Ihm
DOI：
10.1002/0471532053.bra062
发表时间：
1999-02
期刊：
--
影响因子：
--
作者：
Eric A. Grulke
通讯作者：
Eric A. Grulke
影响因子：
5.5
作者：
Hu, JW;Liu, GJ
通讯作者：
Liu, GJ