Insight into reverse selectivity and relaxation behavior of poly[1-(trimethylsilyl)-1-propyne] by flux-lateral force and intrinsic friction microscopy

Synthesis and Gas Transport Properties of Hydroxyl-Functionalized Polyimides with Intrinsic Microporosity

“…13 Specifically, microporous poly(1-trimethylsilyl-1-propyne) (PTMSP) exhibits the highest gas and organicvapor permeabilities of all known glassy polymers to date. 14 In addition, PTMSP shows the highest mixture organic-vapor/ permanent-gas selectivities of all currently existing polymers. 15,16 Recently, a new class of polymers of intrinsic microporosity (PIMs) was reported.…”

“…As a result, they exhibit the following general properties: (i) extremely high gas permeability and low selectivity for separation of small permanent gases; , (ii) extremely high organic vapor permeability and high organic-vapor/permanent-gas selectivity; (iii) blocking of permanent gases by preferential sorption of condensable organic vapors in gas mixture permeation experiments; (iv) negative activation energy of permeation (e.g., increase in permeability with decreasing temperature); and (v) very high BET surface area . Specifically, microporous poly(1-trimethylsilyl-1-propyne) (PTMSP) exhibits the highest gas and organic-vapor permeabilities of all known glassy polymers to date . In addition, PTMSP shows the highest mixture organic-vapor/permanent-gas selectivities of all currently existing polymers. , …”

Free Volume Expansion of Poly[1-(trimethylsilyl)-1-propyne] Treated in Supercritical Carbon Dioxide As Revealed by Positron Annihilation Lifetime Spectroscopy

“…Thanks to its intrinsic nanoporosity, glassy nature ( T g > 300 °C), reverse selectivity, and pronounced hydrophobicity, PTMSP has received much attention in the literature as a promising membrane-forming material. Since Masuda synthesized the polymer for the first time, PTMSP still remains the most permeable polymer for gas separation − and pervaporation applications. − Several researchers have successfully attempted to increase the inherent high free volume of neat PTMSP even more by incorporating inorganic nanofillers in the polymer matrix. − , …”

Nanoscale Mechanical Scattering Experiments towards the Local Analysis of Thermal Active Modes and Dispersion Interactions at Interfaces

“…Dubbed "intrinsic friction analysis" (IFA), it utilizes the mechanical scattering process between a sliding SFM tip in contact with the thermal active modes of the scanned sample. In the past, in particular, rotational and translational modes have been investigated involving complex organic systems, such as polymers and organic molecular glasses [2][3][4][5]. Recently, also molecular binding interactions [1] and surface dispersion interactions [6] could be energetically analyzed with IFA.…”