본 연구에서는 무배향 PLA 필름의 어닐링(annealing) 단계를 통하여 온도별 PLA 필름의 avrami 결정화 속도식을 도출하고 결정화 속도상수(k)를 비교함으로써 최적화된 어닐링 온도를 제안하였다. 120, 130, 140 ˚C 온도에서 결정화 된 필름의 결정화 속도상수(k)는 각각 1.64, 1.68, 1.26이었다. 필름표면에 대한 어닐링은 필름의 표면조도와 동마찰계수에 영향을 주는데 80, 110, 120, 130, 140 ˚C의 온도조건에서 표면조도(Ra)는 각각 0.006, 0.009, 0.015, 0.027, 0.029 μm로 높아졌고 동마찰계수(μk)는 0.45, 0.43, 0.33, 0.31, 0.27로 낮아졌다. 탈크를 1, 3, 5 wt%씩 첨가하는 경우 PLA 필름의 결정화 속도상수(k)는 0.58, 0.46, 0.39로 낮아졌다.

In the study, annealing temperature was optimized by comparing with avrami crystallization rate and constant (k) using non-oriented PLA film as a base film. Crystallization rate constant of PLA film was 1.64, 1.68, and 1.26 at 120 °C, 130 ˚C, and 140 ˚C, respectively. Annealing temperature was mainly affected on the surface properties such as rougnness (Ra) and kinetic friction coefficient (μk). Roughness of PLA film was 0.006 μm at 80 °C and increased to 0.009 μm, 0.015 μm, 0.027 μm, and 0.029 μm at 110 °C, 120 ˚C, 130 °C and 140 ˚C, respectively. Kinetic friction coefficient decreased 0.45 to 0.43, 033, 0.31, 0.27 as annealing temperature was at 80 ˚C, 110 ˚C, 120 °C, 130 ˚C, and 140 ˚C, respectivly. In addition, rate constant (k) was 0.58, 0.46, and 0.39 with adding 1 wt%, 3 wt%, and 5 wt% talc, respectively.