Lee, Hyeseong Jang, Ji-un Kim, Jaewoo Kim, Yoon Sang Cho, Jaehyun Kim, Mi Na Lee, Jung Tae Choi, Woo Hyuk Song, Jong Man Song, Won June Won, Dong Hui Yun, Deok Woo Kim, Seong Hun Kim, Minkook Kim, Seong Yun 2024-01-19T09:31:47Z 2024-01-19T09:31:47Z 2023-05-25 2023-06 1385-8947 https://pubs.kist.re.kr/handle/201004/113697 The development of vehicle bodies based on lightweight structural composites is urgently required to upgrade electric cars and to commercialize urban air mobility. Self-reinforced composites (SRCs) are attracting attention due to their advantages in terms of price, lightness, disposal and recycling compared to carbon fiber-reinforced polymers (CFRPs). In this study, a new concept for 100% polypropylene (PP) SRC was proposed to simulta-neously improve the adhesive, tensile and impact properties of SRCs without undermining the advantages of SRCs. For this implementation, a facile engineering strategy using quad screw extrusion (QSE) capable of generating high shear stress was employed to modify the melting temperature and impregnation properties of the PP matrix via controlling polymer chain structure. As the screw rotation speed of QSE increased, low molecular weight polymer chains with uniform chain lengths were prepared, which led to a decrease in the melting temperature of the PP matrix and an increase in the flowability and impregnation property of the matrix. Using this strategy, the adhesive strength, tensile strength and impact resistance of the optimized SRC improved by 333%, 228%, and 2700%, respectively. Racing drone flight experiments with the SRC and CFRP frames illus-trated the advantages of the SRC frame such as the increase of the flight time due to low density of the SRC, the excellent impact resistant characteristics (which improves user safety), and the superior electrical insulation properties suitable for frequency transmission and reception. Therefore, the proposed SRC can be an ideal choice as a lightweight structural material for future mobility. English Elsevier BV True self-reinforced composites enabled by tuning of molecular structure for lightweight structural materials in future mobility Article 10.1016/j.cej.2023.142996 1 Chemical Engineering Journal, v.465 Chemical Engineering Journal 465 N scie scopus 000984577500001 2-s2.0-85152967482 Engineering, Environmental Engineering, Chemical Engineering Article POLY(METHYL METHACRYLATE) ISOTACTIC POLYPROPYLENE MECHANICAL-PROPERTIES IMPACT ENERGY RETARDANT BEHAVIOR Self-reinforced composite Lightweight structural material Future mobility Drone