通过阳离子活性开环聚合和大分子酯化反应的两步法,合成两亲性的聚消旋丙交酯-b-聚氧乙烯(sPDLLA-b-PEO)六臂星形嵌段聚合物.通过差示扫描量热法研究了聚合物本体结晶行为.结果表明,无定形链段PDLLA的引入和特定的星形结构,使得PEO链段的结晶受到限制,出现了冷结晶现象,并且最高结晶温度随着升温速率的增大而升高.通过偏光显微镜研究了六臂嵌段聚合物的结晶形貌,发现六臂sPDLLA-b-PEO生长产生环带球晶.并且通过调控聚合物与溶剂的比例和聚合物膜的厚度,发现溶剂可以减小球晶生长中积累的应力,使环带结构消失;但六臂聚合物对于几何受限的响应性较强,当膜厚减小时,环带结构重新出现.
参考文献
| [1] | Chen, N.;Yan, L.-T.;Xie, X.-M. .Interplay between crystallization and phase separation in PS-b-PMMA/PEO blends: The effect of confinement[J].Macromolecules,2013(9):3544-3553. |
| [2] | Yan-Feng Chen;Feng-Bo Zhang;Xu-Ming Xie .Effects of micelle structures formed in selective solvents on crystallization behaviors of poly(ethylene glycol)-b-poly(styrene)copolymers[J].Polymer: The International Journal for the Science and Technology of Polymers,2007(9):2755-2761. |
| [3] | Yueh-Lin Loo;Richard A. Register;Anthony J. Ryan;Gregory T. Dee .Polymer Crystallization Confined in One, Two, or Three Dimensions[J].Macromolecules,2001(26):8968-8977. |
| [4] | Yu, P.-Q.;Yan, L.-T.;Chen, N.;Xie, X.-M. .Confined crystallization behaviors and phase morphologies of PVCH-PE-PVCH/PE homopolymer blends[J].Polymer: The International Journal for the Science and Technology of Polymers,2012(21):4727-4736. |
| [5] | Shuichi Nojima;Masashi Toei;Shigeo Hara;Satoshi Tanimoto;Shintaro Sasaki .Size dependence of crystallization within spherical microdomain structures[J].Polymer: The International Journal for the Science and Technology of Polymers,2002(14):4087-4090. |
| [6] | A.T.Lorenzo;A.J.Muller;Ming-ChampLin;Hsin-LungChen;U-SerJeng;D.Priftis;M.Pitsikalis;N.Hadjichristidis .InfluenceofMacromolecularArchitectureontheCrystallizationof(PCL2)-b-(PS2)4-MiktoarmStarBlockCopolymersinComparisontoLinearPCL-b-PSDiblockCopolymerAnalogues[J].Macromolecules,2009(21):8353-8364. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%