Effects of nano calcium carbonate on the properties of frontal-polymerized dicyclopentadiene resin

doi:10.19936/j.cnki.2096-8000.20250928.005

Abstract

Abstract: This study was systematically conducted to investigate the effects of nano-CaCO₃ modification on the processing, thermal stability, and mechanical properties of frontal-polymerized dicyclopentadiene (DCPD) resin. The results demonstrate that the incorporation of nano-CaCO₃ significantly optimized the processing window of DCPD resin. Thus, the initial curing temperature and peak curing temperature are decreased by 16.16 ℃ and 13.92 ℃, respectively, while the room-temperature gelation time extends beyond 2.5 h. Furthermore, as nano-CaCO₃ suppressed the mobility of molecular chain, the glass transition temperature (T_g) is elevated to 127.9 ℃, which is a 33.79% increase over that of the pure resin. Mechanically, the flexural strength, tensile modulus, and impact strength are improved to 60.53 MPa, 1.90 GPa and 4.84 kJ/m² with the optimal nano-CaCO₃ content (3wt%~4wt%), representing improvements of 13.27%, 57.02% and 9.09%, respectively. However, due to the stress concentration caused by the agglomeration of nano-CaCO₃ particles at high content (>5wt%), the mechanical properties of the DCPD resin are degraded. This work could provide insights for designing high-performance frontal-polymerized polymer composites with tailored processability and thermal-mechanical properties.

Key words: Nano-CaCO₃, frontal polymerization, dicyclopentadiene resin, thermal stability, mechanical properties, process optimization, composites

CLC Number:

TB332

LI Kehui, ZHANG Yueyao, SONG Longjie, YANG Liling, CHEN Dingding, XING Suli, YIN Changping, TANG Jun. Effects of nano calcium carbonate on the properties of frontal-polymerized dicyclopentadiene resin[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(9): 35-41.

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