Citation: Ting Yu, Jian-qiang Zhang, Ya Li, Su-dan Shen, Wen-feng Wei, Peng Chen, Zong-bao Wang, Qun Gu. SOLUTION CRYSTALLIZATION BEHAVIOR OF LINEAR AND STAR-SHAPED POLY(ETHYLENE GLYCOL)-b-POLY(-CAPROLACTONE) BLOCK COPOLYMERS[J]. Chinese Journal of Polymer Science, ;2013, 31(12): 1717-1724. doi: 10.1007/s10118-013-1365-x shu

SOLUTION CRYSTALLIZATION BEHAVIOR OF LINEAR AND STAR-SHAPED POLY(ETHYLENE GLYCOL)-b-POLY(-CAPROLACTONE) BLOCK COPOLYMERS

Ting Yu ¹ ,
Jian-qiang Zhang ^2,3,4 ,
Ya Li ^2,5,4 ,
Su-dan Shen ¹ ,
Wen-feng Wei ¹ ,
Peng Chen ¹ ,
Zong-bao Wang ¹ ,
Qun Gu ¹

1.
Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
2.
1. Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
3.
2. School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China
4.
5.
2. Institute of Material Engineering, Ningbo University of Technology, Ningbo 315016, China

Received Date: 18 January 2013
Revised Date: 17 March 2013

Fund Project: This project was financially supported by the National Natural Science Foundation of China (Nos. 21004073 and 51003117), Zhejiang Province Innovative Research Team (No. 2009R50013), Ningbo Innovative Research Team (No. 2009B21008), Ningbo Key Lab of Polymer Materials (No. 2010A22001), Zhejiang Provincial Natural Science Foundation (No. Y4100517).

Lamellar crystals of diblock, triblock and four-arm poly(ethylene glycol)-b-poly(-caprolactone) (PEG-b-PCL) crystalline-crystalline copolymers were successfully obtained from their solution. Morphology and structure of lamellar crystals of crystalline-crystalline copolymers were investigated using tapping-mode atomic force microscopy (AFM) and selected area electron diffraction (SAED). All of these samples showed the truncated-lozenge multilayer basal shapes with central screw dislocation or central stack, which were all obtained simultaneously from the oil bath. The diffraction pattern of PEG block lamellar crystal is attributed to the (120) diffracting planes and the pattern of PCL block lamellar crystal is attributed to the (110) diffracting planes and (200) diffracting planes according to the SAED results. Four (110) crystal growth planes and two (200) crystal growth planes are discovered for the PCL blocks, but the (120) crystal growth planes of PEG blocks are hided in the figure of AFM. The crystalline structure of the four-arm copolymers (FA) is more disorder and confused than that of the diblock (DI) copolymer and the striated fold surface structures of lamellar crystals of four-arm copolymers (FA) are smoother than these of linear analogues, owing to the confused crystallization of blocks caused by the mutual restriction of blocks and the hindrance of the dendritic cores. In addition, the aspect ratio of FA is greater than that of the others. It is hypothesized that there are two reasons for the change of aspect ratios. First, the (200) diffracting planes of PCL crystals grew slowly compared to their (110) diffracting planes because of difference in the energy barrier. Secondly, edge dislocations on the (200) diffracting planes are also responsible for the variation of the aspect ratio. Consequently, the crystalline defects are augmented by the competing blocks crystallized simultaneously and the hindrance of the dendritic cores.
- Lamellar crystal,
- Topological structure,
- PEG-b-PCL,
- Edge dislocation,
- Aspect ratio
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