Shock melting of lamellae-forming block copolymers

Shock compression of semiflexible polymers

“…This can be attributed, among other factors, to pressure-induced breaking and re-formation of covalent bonds. 23 Using molecular dynamics simulations the shock response of several systems were analyzed, including segmented polyureas and polyurethanes, 11,24–26 crystalline polymers, 15,27,28 block copolymers, 11,12 and amorphous systems. 29–33…”

“…This can be attributed, among other factors, to pressure-induced breaking and re-formation of covalent bonds. 23 Using molecular dynamics simulations the shock response of several systems were analyzed, including segmented polyureas and polyurethanes, 11,[24][25][26] crystalline polymers, 15,27,28 block copolymers, 11,12 and amorphous systems. [29][30][31][32][33] In the present study, we focus on the shock compression of semiflexible chains, a topic that remains relatively underresearched compared to other polymer systems.…”

“…8,9 In these polymeric systems, it is believed that their capacity for impact absorption comes from the combination of randomly distributed nanoscopic domains of soft and hard segments. 7,[10][11][12] In this case, the soft domains are thought to be the main factor for impact dissipation, while the hard domains are expected to be a source of shock wave dispersion. 6 Applications include building and helmet coatings, reinforced structural composites, artificial joints for orthopedic devices, body armor, and coatings for satellite applications.…”

Mechanisms of Shock Dissipation in Semicrystalline Polyethylene

“…At low shock pressures below the threshold for breaking chemical bonds, other essentially thermophysical mechanisms to dissipate energy must be activated. For example, simulations of shocked diblock copolymers in a lamellar morphology revealed that the polymers can absorb the energy of a shock wave by decreasing the segregation of their initially distinct phases [7].…”