中文摘要
在过去的几十年里，有关嵌段共聚物的结晶研究大都集中在结晶－非晶性的两嵌段共聚物。而对于两段都是结晶链段的双结晶性嵌段共聚物的单晶研究，至今相关报道很少。因此，我们选择以聚己内酯（PCL）、聚L-丙交酯（PLLA）及其与聚乙二醇（PEG）的嵌段共聚物为代表来研究有关双结晶性嵌段共聚物的单晶。本项目将合成不同分子量的PEG-PCL，PEG－PLLA以及PCL-PLLA；研究双结晶嵌段共聚物的单晶培养过程，严格控制单晶形成所需的实验条件，如熔剂种类，溶液浓度，结晶温度等。详细研究嵌段共聚物的单晶形貌及结晶片层厚度的信息，考察相对嵌段长度对单晶形貌和结晶顺序的影响，研究先结晶嵌段和后结晶嵌段在整个嵌段共聚物单晶形貌中各自的体现以及对嵌段共聚物单晶形貌的贡献，考察先结晶的嵌段的单晶与后结晶的嵌段的单晶之间的关系，最后构筑出双结晶性嵌段共聚物的结晶机理。
英文摘要
Recently crystallization and morphology development of block copolymers have been investigated widely. But there are only a few studies on block copolymers composed of double crystallizable blocks because of the complexity compared with crystalline- amorphous block copolymers.In this project, our attention is focused on the crystalline morphology of poly(ethylene glycol)-block-poly(L-lactide) (PEG-b- PLLA) and poly(ethylene glycol) -block- Poly (ε-caprolactone) (PEG-b-PCL) diblock copolymer in which both blocks can crystallize.The morphology and structure of the single crystals of the PLLA or PCL block and the PEG block in the PEG-PLLA as well as PEG-PCL diblock copolymers obtained by melt crystallization and solution crystallization were investigated. The remarkable mutual influence between the two blocks was observed and explained.Furthermore, the growing process and conditions of the single crystal was also studied including crystallization time, crystallization temperature, concentration, solution and so on.The crystallization mechanism of the double-crystalline dibolock copolymers was elucidated.
结题摘要
在过去的几十年里，有关嵌段共聚物的结晶研究大都集中在结晶－非晶性的两嵌段共聚物。而对于两段都是结晶链段的双结晶性嵌段共聚物的单晶研究，至今相关报道很少。因此，我们选择以聚己内酯（PCL）、聚L-丙交酯（PLLA）及其与聚乙二醇（PEG）的嵌段共聚物为代表来研究有关双结晶性嵌段共聚物的单晶。本项目将合成不同分子量的PEG-PCL，PEG－PLLA以及PCL-PLLA；研究双结晶嵌段共聚物的单晶培养过程，严格控制单晶形成所需的实验条件，如熔剂种类，溶液浓度，结晶温度等。详细研究嵌段共聚物的单晶形貌及结晶片层厚度的信息，考察相对嵌段长度对单晶形貌和结晶顺序的影响，研究先结晶嵌段和后结晶嵌段在整个嵌段共聚物单晶形貌中各自的体现以及对嵌段共聚物单晶形貌的贡献，考察先结晶的嵌段的单晶与后结晶的嵌段的单晶之间的关系，最后构筑出双结晶性嵌段共聚物的结晶机理。