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<p>Effects of concentration (0–0.5 wt%) and type of thermally reduced graphene oxide (TRGO) and diblock copolymer-grafted TRGO, namely, TRGO-g-poly(butyl acrylate)-b-poly(methyl acrylate-co-glycidyl methacrylate) (TRGO-Gx-yK) with GMA compositions in P(MA-co-GMA) at 10 or 20 mol% (x = 10 or 20) and M<sub>n</sub> for grafted polymer PBA-b-P(MA-co-GMA) at 30 K, 17 K, or 8 K (y = 30, 17, or 8), as low-profile additives (LPA) for unsaturated polyester resins (UP), on cured sample morphologies and properties of low-shrink UP after cure at 110 °C have been investigated. The decreasing order of compatibility for styrene (St)/UP/TRGO-polymer system before reaction, as predicted by the molecular polarity difference per unit volume between UP and grafted polymer of TRGO-polymer, showed that TRGO-Gx- 8 K &gt; TRGO-Gx- 17 K &gt; TRGO-Gx- 30 K, and TRGO-G20-yK &gt; TRGO-G10-yK. The trend was in agreement with that of decreasing mutual miscibility of St/UP/TRGO-polymer system after cure at 110 °C, as observed from SEM and TEM micrographs. Adding 0.5 wt% of TRGO-polymer with M<sub>n</sub> = 8000 for PBA-b-P(MA-co-GMA) and 20 mol% GMA in P(MA-co-GMA) as LPA can lead to a decrease of volume shrinkage by 64%, an increase of Young’s modulus by 12%, a slight decrease of tensile strength by 9%, a decrease of impact strength by 14%, an increase of thermal conductivity by 22%, and a decrease of surface resistivity by 99.9%, when compared with that of neat St/UP cured system. All properties depended on M<sub>n</sub> and GMA composition for grafted polymer onto TRGO, and followed the decreasing order of TRGO-Gx- 8&#xa0;K &gt; TRGO-Gx- 17 K &gt; TRGO-Gx- 30 K and TRGO-G20-yK &gt; TRGO-G10-yK &gt; TRGO.</p>

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Synthesis of polymer-grafted thermally reduced graphene oxide by RAFT polymerization and their effects on properties of cured unsaturated polyester resins. II. Volume shrinkage, mechanical properties, thermal conductivity, and surface resistivity

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  • 发表日期：

    2025年4月21日

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  • Rong-Woei Chang,
  • Yeong-Jenq Wang,
  • Jy-Ning Yang,
  • Yan-Jyi Huang

摘要

Effects of concentration (0–0.5 wt%) and type of thermally reduced graphene oxide (TRGO) and diblock copolymer-grafted TRGO, namely, TRGO-g-poly(butyl acrylate)-b-poly(methyl acrylate-co-glycidyl methacrylate) (TRGO-Gx-yK) with GMA compositions in P(MA-co-GMA) at 10 or 20 mol% (x = 10 or 20) and Mn for grafted polymer PBA-b-P(MA-co-GMA) at 30 K, 17 K, or 8 K (y = 30, 17, or 8), as low-profile additives (LPA) for unsaturated polyester resins (UP), on cured sample morphologies and properties of low-shrink UP after cure at 110 °C have been investigated. The decreasing order of compatibility for styrene (St)/UP/TRGO-polymer system before reaction, as predicted by the molecular polarity difference per unit volume between UP and grafted polymer of TRGO-polymer, showed that TRGO-Gx- 8 K > TRGO-Gx- 17 K > TRGO-Gx- 30 K, and TRGO-G20-yK > TRGO-G10-yK. The trend was in agreement with that of decreasing mutual miscibility of St/UP/TRGO-polymer system after cure at 110 °C, as observed from SEM and TEM micrographs. Adding 0.5 wt% of TRGO-polymer with Mn = 8000 for PBA-b-P(MA-co-GMA) and 20 mol% GMA in P(MA-co-GMA) as LPA can lead to a decrease of volume shrinkage by 64%, an increase of Young’s modulus by 12%, a slight decrease of tensile strength by 9%, a decrease of impact strength by 14%, an increase of thermal conductivity by 22%, and a decrease of surface resistivity by 99.9%, when compared with that of neat St/UP cured system. All properties depended on Mn and GMA composition for grafted polymer onto TRGO, and followed the decreasing order of TRGO-Gx- 8 K > TRGO-Gx- 17 K > TRGO-Gx- 30 K and TRGO-G20-yK > TRGO-G10-yK > TRGO.