Self-gradient mechanism, morphology and damping analysis of a thickness continuous gradient epoxy–polyurethane interpenetrating polymer network

Tuning chain extender structure to prepare high-performance thermoplastic polyurethane elastomers

“…Morphology of the sample belongs to the elastic fracture. 47,48 Fig. 4d is a magnified image of the marked region in the bottom part in Fig.…”

Facile fabrication of polyurethane-based graphene foam/lead zirconate titanate/polydimethylsiloxane composites with good damping performance

“…Normally, the tan d value of an engineering damping material is required to be higher than 0.3 and the temperature range where tan d > 0.3 should be as wide as possible. 8,9,25 The loss factor values of the PDMS matrix and PGPP composites as a function of temperature are shown in Fig. 8(c).…”

“…Generally, the requirement for the damping loss factor of practical engineering materials is for it to be above 0.3 and the temperature range where tan d > 0.3 should be as wide as possible. [8][9][10] As described above, polymers can be used as high performance damping materials due to their excellent viscoelasticity and good processibility. However, the good damping behavior of polymers is normally limited to a narrow temperature range of T g AE 10 C, which limits their practical use under many conditions.…”

Facile fabrication of polyurethane/epoxy IPNs filled graphene aerogel with improved damping, thermal and mechanical properties

“…The requirement for practical engineering materials is that the tan d value should be above 0.3 and temperature range of tan d > 0.3 should be as wide as possible. [8][9][10] However, good damping performance of polymers is usually limited to a narrow temperature range of T g AE 10 C, which limits their practical use. 11 Many techniques have been used to enhance damping properties of polymers, such as creation of polymer blends, 12,13 copolymers, 14,15 and interpenetrating polymer networks (IPNs).…”

“…8,16 IPN is a novel type of polymer alloy comprising two or more crosslinked polymers held together by physical entanglement, and it is promising material with broad T g ranges and excellent damping performance. 11 Polyurethane (PU)/epoxy resin (EP) IPNs, which integrate the advantages of polyurethane's high damping performance and epoxy resin's high mechanical behavior, have been widely studied in previous reports, [9][10][11] with expectations of obtaining good structural damping materials. However, the addition of PU into EP matrix can lead to reduction of mechanical and thermal properties due to the low modulus and thermal stability of PU polymer.…”