The reinforcement of polyurethane by mini-sized graphene with superior performances

3 wt% mini-sized graphene filled polyurethane exhibits improved 81% tensile strength and 126.7% modulus at an elongation of 605%, and 17 times thermal conductivity (4.24 W/m·K) over PU. There exist more hydrogen bonds and improved microphase separation of hard and soft segments for the reinforcement...

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Veröffentlicht in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2024-02, Vol.482, p.148668, Article 148668
Hauptverfasser: Chen, Qian, Li, Xiaoyun, Yang, Zhiyuan, Meng, Xiaqing, Zhao, Yuhua, Kang, Maoqing, Li, Qifeng, Wang, Junzhong, Wang, Junwei, Wang, Junying
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Sprache:eng
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Zusammenfassung:3 wt% mini-sized graphene filled polyurethane exhibits improved 81% tensile strength and 126.7% modulus at an elongation of 605%, and 17 times thermal conductivity (4.24 W/m·K) over PU. There exist more hydrogen bonds and improved microphase separation of hard and soft segments for the reinforcement of polyurethane by mini-sized graphene. [Display omitted] •Graphene filler features small sheet size (300 × 400 nm) and low defects.•3 wt% graphene filling polyurethane was optimized.•Improved 81% tensile strength, 126.7% modulus and 17 times thermal conductivity.•The reinforcement results from promoted microphase separation and hydrogen bonds. Graphene filler can improve certain properties of a polymer, but often compromises others, partially because it is difficult to control graphene size and dispersion at high content in polymer matrix. In this work, we present that mini-sized sheet sizes (300 × 400 nm) of graphene microsheets (mG) up to 7 wt% are filled in polyurethane (PU) reaching improved performances including mechanical properties (tensile strength, modulus, shape memory), electrical conductivity, thermal conductivity, thermal stability and flame retardance. The filling of 3 wt% mG in PU involves the enhancements of 81 % tensile strength (41.6 MPa at the elongation at break of 605 %), 126.7 % of modulus, 17 times of thermal conductivity (4.24 W/m·K) and 50℃ of thermal stability over net PU. The extensive characterizations disclose that hydrogen bonds strengthened and microphase separation promoted in the PU composite with the filling of the planar shape, hydrophilic edge and low defects of small graphene microsheets. This investigation presents a great potential of extending polymer materials with the filler of graphene microsheets derived from microcrystalline graphite minerals.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2024.148668