Emergency traffic distribution and related traffic organization method under natural disasters

Flame retarded polyurethane vitrimers containing isocyanurate rings: Synthesis and properties

“…The DCs used in this study are DC4, DC6 and DC10 (based on BDA, HDA and DDA, respectively) so that the products with a certain feed ratio of DC and THEIC (DC/THEIC = 3/2) are nominated as VPICU4-3/2, VPICU6-3/2, and VPICU10-3/2, respectively. The introduction of isocyanurate ring offers flame retardancy for VPICUs, 23,24,50 thus the content of isocyanurate moiety in the obtained VPICUs determines the flame retardancy. In addition, the degree of reactive functions (represented by free hydroxyl group in THEIC) has an influence on the reaction degree, the relaxation time and the retardancy.…”

“…The absorption band at 1708 cm À1 is related to the C=O stretching signal of isocyanurate group while the band at 1647 cm À1 is to the C=O stretching of the urethane group. 23 The two peaks at 2945 and 2860 cm À1 correspond to the asymmetrical and symmetrical C-H stretching of the aliphatic methylene group while the signal at 1546 cm À1 correspond to the C-N stretching of urethane group. 51 The peak at 1462 cm À1 is the signal of the C-N stretching signal of the isocyanurate group.…”

“…18 Due to the certain reactivity of ICA, lots of derivatives bearing reactive functions can be obtained, 22 for instance, triglycidyl isocyanurate (TGIC), tri(2-hydroxyethyl) isocyanurate (THEIC), tri(2-carboxyethyl) isocyanurate (TCEIC), bis(2-carboxyethyl) isocyanurate (BCEIC), etc. In our previous study, 23,24 polyisocyanuratoesters (PICE) were prepared from BCEIC and diols, and epoxy resins (ER) were synthesized using TGIC and diacids. Both polymers possess inherently isocyanurate structure, which bring them excellent thermal stability and flame resistance.…”

“…Moreover, when comparing crosslinked and linear PICEs, the crosslinked ones are found to exhibit superior mechanical properties. 23,24 Although many different isocyanurate-based flameretarded polyurethanes (PUs) are available, [23][24][25][26] they are chemical crosslinked and non-reprocessable, which limits their further applications and reusability.…”

Simulation study on traffic organization mode of double-decker highway

“…The emergency traffic distribution method and the traffic organization method of the emergency traffic network was studied1 [1]. Facing the needs of macro traffic flow organization and safety management, a traffic organization mode meeting the travel needs is proposed [2].…”