Citation: Xue Li, Hai-lan Kang, Jian-xiang Shen, Li-qun Zhang, Toshio Nishi, Kohzo Ito. Miscibility, Intramolecular Specific Interactions and Mechanical Properties of a DGEBA Based Epoxy Resin Toughened with a Sliding Graft Copolymer[J]. Chinese Journal of Polymer Science, ;2015, 33(3): 433-443. doi: 10.1007/s10118-015-1596-0 shu

Miscibility, Intramolecular Specific Interactions and Mechanical Properties of a DGEBA Based Epoxy Resin Toughened with a Sliding Graft Copolymer

Xue Li ¹ ,
Hai-lan Kang ¹ ,
Jian-xiang Shen ¹ ,
Li-qun Zhang ^2,3,4,, ,
Toshio Nishi ⁵ ,
Kohzo Ito ⁶

1.
State Key Laboratory for Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
2.
1. State Key Laboratory for Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
3.
2. Key Laboratory of Beijing City for Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, China
4.
5.
Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan
6.
Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan

Corresponding author: Li-qun Zhang,
Received Date: 30 May 2014
Revised Date: 15 July 2014

Fund Project: This work was financially supported by the National Natural Science Foundation of China (Nos. 50933001, 51221002 and 51320105012).

The sliding graft copolymer (SGC), in which many linear poly-e-caprolactone (PCL) side chains are bound to cyclodextrin rings of a polyrotaxane (PR), was prepared and employed to toughen diglycidyl ether of bisphenol A (DGEBA) based epoxy resin. The aim of the work is to understand the effect of SGC on the miscibility, morphology, thermal behavior, curing reaction and mechanical performance of the cured systems. From differential scanning calorimetry (DSC) analysis and dynamic mechanical thermal analysis (DMTA) of DGEBA/SGC thermosetting blends, it is found that DGEBA and SGC are miscible in the amorphous state. Fourier transform infrared spectroscopy (FTIR) suggested that the miscibility between SGC and DGEBA is due to the existence of intermolecular specific interactions (viz. hydrogen bonding). The impact strength is improved by 4 times for DGEBA/SGC (80/20) blends compared with that of the unmodified system. The increase in toughness of SGC-modified thermosets can be explained by the effect of intermolecular specific interactions of SGC with DGEBA, which is beneficial to induce the plastic deformation of matrix. This is the first report on utilizing this novel supramolecular polymer to toughen rigid epoxy matrix.
- Epoxy,
- Sliding graft copolymer,
- Toughen,
- Miscibility,
- Hydrogen bonding
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