Thermal degradation behavior of rigid polyurethane foams prepared with different fire retardant concentrations and blowing agents

Spacer‐length‐dependent association in polymers with multiple‐hydrogen‐bonded end groups

“…[1][2][3][4] Theoretical work has shown that the domain size and morphology of the phase-separated structures critically depend on the strength of the interpolymer noncovalent interactions. [5][6][7][8][9][10] To achieve these attractive enthalpic interpolymer interactions, end-functionalized homopolymers have been prepared with functional groups capable of noncovalent assembly such as hydrogen bonding, [11][12][13][14][15][16][17][18][19][20] ionic, 21 transition-metal, 22,23 host-guest, [24][25][26] and fluorophilic 27 interactions. Typically, these functional groups are attached to a homopolymer via a short, aliphatic spacer.…”

“…KEYWORDS: atom transfer radical polymerization (ATRP); diffusion-ordered spectroscopy; hydrogen bonding; supramolecular diblock copolymers INTRODUCTION The combination of supramolecular chemistry and the controlled phase separation of diblock copolymers can result in a wealth of nanoscale morphologies with applications ranging from semiconductor integrated circuit design to the development of subnanometer porous films for separation processes. [1][2][3][4] Theoretical work has shown that the domain size and morphology of the phase-separated structures critically depend on the strength of the interpolymer noncovalent interactions.5-10 To achieve these attractive enthalpic interpolymer interactions, end-functionalized homopolymers have been prepared with functional groups capable of noncovalent assembly such as hydrogen bonding, [11][12][13][14][15][16][17][18][19][20] ionic, 21 transition-metal, 22,23 host-guest, 24-26 and fluorophilic 27 interactions. Typically, these functional groups are attached to a homopolymer via a short, aliphatic spacer.…”

“…5-10 To achieve these attractive enthalpic interpolymer interactions, end-functionalized homopolymers have been prepared with functional groups capable of noncovalent assembly such as hydrogen bonding, [11][12][13][14][15][16][17][18][19][20] ionic, 21 transition-metal, 22,23 host-guest, 24-26 and fluorophilic 27 interactions. Typically, these functional groups are attached to a homopolymer via a short, aliphatic spacer.…”

Phase behavior predictions for polymer blends containing reversibly associating endgroups

“…Associating endgroups may also enable new polymer blends containing traditionally immiscible polymers and will further development the concept of supramolecular block copolymers. [28][29][30][31][32][33] Much of our understanding of solution phase behavior of telechelic associating polymers derives from the classical models of reversible polycondensation developed by Jacobson and Stockmayer 34 and from the lattice theory proposed by Flory and Huggins. 35 More recently, Semenov and Rubinstein 36 developed a meanfield model for thermoreversible association of polymers in solution.…”

Olefin metathesis and quadruple hydrogen bonding: A powerful combination in multistep supramolecular synthesis

“…Such a material requires immiscible polymeric components, in which macrophase separation is prevented by strong and complementary noncovalent bonds between the telechelic blocks. Telechelic polymers with multiple H-bonding endgroups have been prepared by means of postpolymerization modification routes (14)(15)(16)(17)(18)(19)(20)(21)(22). However, incomplete reaction leads to small, yet detrimental, amounts of monofunctionalized polymers, which act as chain stoppers.…”