Kim, YC Ahn, W Kim, CY 2024-01-21T18:15:51Z 2024-01-21T18:15:51Z 2021-09-04 1997-06 0032-3888 https://pubs.kist.re.kr/handle/201004/143783 Multiple melting characteristics of a highly isotactic polypropylene (iPP) were studied by means of differential scanning calorimetry (DSC). Double melting characteristics were observed on melting IPP crystallized isothermally at temperatures ranging from 110 to 140 degrees C. iPP crystallized below and above 125 degrees C exhibited different double melting characteristics from each other. For iPP crystallized below 125 degrees C, the single melting peak split into two peaks during slow DSC heating scans without changing the total crystallinity in the polymer. On the other hand, the double melting endotherm of iPP crystallized above 125 degrees C seemed to come from two preexisting crystal fractions having different T-m. There existed an optimum annealing temperature range where the five-minute annealing of iPP raised T-m of the polymer significantly. The treatment also increased the crystallinity of iPP crystallized isothermally at 110 degrees C by 12%. English SOC PLASTICS ENG INC BEHAVIOR A study on multiple melting of isotactic polypropylene Article 10.1002/pen.11745 1 POLYMER ENGINEERING AND SCIENCE, v.37, no.6, pp.1003 - 1011 POLYMER ENGINEERING AND SCIENCE 37 6 1003 1011 scie scopus A1997XG32500011 2-s2.0-0031167880 Engineering, Chemical Polymer Science Engineering Polymer Science Article; Proceedings Paper BEHAVIOR polypropylene