| 초록 |
It has been believed that stereo-irregular polymers cannot form crystalline structure because of the deficient ordering along the backbone direction. Here we show the crystallization of atactic polymers by rapid thermal quenching of polymers co-melted with an entropy diluent. To this end, a-PMMA, a-PS and polycarbonate are crystallized by using entropy diluent, BA. The preferential hydrogen bonding and pi-pi interaction between polymers and BA compensates the conformational entropy loss of polymer chains in solutions. Due to highly stretched structure, the crystals prepared by the entropy diluent show unusual physical properties including extremely high melting points and mechanical strength and unprecedented crystalline transitions. |
