화학공학소재연구정보센터
Macromolecules, Vol.46, No.11, 4481-4490, 2013
Crystallization of Supramolecular Pseudoblock Copolymers
Because of the presence of supramolecular bonds, the crystallization process of supramolecular pseudoblock copolymers (SPBCP) is more complex in comparison to conventional covalently bonded block copolymers (BCP). Thus, supramolecular binding motives included on the polymer chain ends display additional dynamic effects as well as possible nuclei for the crystallization. In this article we systematically study nonisothermal crystallization processes in SPBCP's consisting of a crystallizable poly(epsilon-caprolactone) (PCL) connected via triple hydrogen bonds to either a short alkyl modified 2,4-diaminotriazine, or bound to a large block of amorphous poly(isobutylene) (PIB). The crystallization of the PCL is studied with both groups acting as supramolecular barriers for the crystallization process, either during nucleation or during crystal growth. A strong influence of the short alkyl modified 2,4-diaminotriazine barrier on the crystallization temperature of the PCL compared to the control sample devoid of this compound is observed. In contrast, the large polymer block (PIB) acting as a barrier causes a strong decrease of the crystallization temperature and fractionated crystallization of SPBCP consisting of smaller PCL-chains is observed.