고분자 현탁액의 90 vol%를 차지하는 DMF 용매가 80˚C, 120˚C 온도에서 증발에 의해 사라지면서 수직 배향의 BN 나노시트에 의해 필름 표면이 자동으로 절단된 것으로 판단된다.
It was considered that the film surfaces were automatically severed by the BN nanosheets with perpendicular orientation as the DMF solvents occupying 90 vol % of the polymer suspension was disappeared by evaporation at temperature of 80˚C and then at temperature of 120˚C.