Switching on/switching off solubility controlled permeation of hydrocarbons through glassy polynorbornenes by the length of side alkyl groups

Making accessible soluble silicon-containing polynorbornenes: hydrosilylation of vinyl-addition poly(5-vinyl-2-norbornene)

“…Through detailed analysis of hydrocarbon permeation behaviour, it can be elucidated that both the modified polymers and the initial PVNB exhibited solubility-controlled permeation of gaseous hydrocarbons (i.e., the permeation of a hydrocarbon increases with the size of penetrant molecules, Tables 4 and 7). This behaviour is opposite to that of vinyladdition polynorbornene without substituents (PNB), for Table 4 Gas permeability of the modified vinyl-addition polynorbornenes in comparison with vinyl-addition polynorbornene (PNB) 44 Polymer Chemistry Paper which e.g. the butane/methane selectivity is less than 1.…”

“…Materials 5-Ethylidene-2-norbornene, 5-vinyl-2-norbornene, Karstedt's catalyst, Rh(acac)(CO) 2 , triethylsilane (Et 3 SiH), 1,1,1,3,5,5,5heptamethyltrisiloxane (HMTS-H), 1,1,3,3,3-pentamethyldisiloxane (PMDS-H) as well as all solvents were purchased from ABCR and Aldrich, and used without additional purification. Vinyl-addition poly(5-vinyl-2-norbornene) (PVNB), 35 2-vinyl-norbornane, 40 and 2-ethylidene-norbornane 46 were syn- Table 6 Solubility coefficients of various gases within the modified vinyl-addition polynorbornenes in comparison with vinyl-addition polynorbornene (PNB) 44 and PVNB Polymer Solubility coefficient (S), S × 10 3 , cm 3 (STP) cm −3 cm (Hg) Fig. 11 The dependences of diffusion (a) and solubility (b) coefficients on the squared cross-section diameter and critical temperature of penetrants, respectively, for the modified vinyl-addition polynorbornenes.…”

Gas-Transport and the Dielectric Properties of Metathesis Polymer from the Ester of exo-5-Norbornenecarboxylic Acid and 1,1′-Bi-2-naphthol

“…Another interesting feature is the diffusivity-controlled permeability of hydrocarbons through polyNBi. Usually, such type polymers with hydrocarbonic or organosilicon-side groups possess solubility-controlled permeability of hydrocarbons [38,39]. Nevertheless, although there are large carbocyclic groups in side-chains of polyNBi, permeability of C 2 H 6 was noticeably lower than CH 4 permeability.…”

Analysis of Permeation of Low‐Molecular‐Weight Hydrocarbons through Polyolefins for Testing of a New Developed Method

“…This includes parameters such n-pentane 0.623 [10] n-hexane 0.660 [10] n-octane 0.733 n-decane 0.796 Benzene 0.576 [10] Toluene 0.629 as the structure of the permeating substance and the temperature. In the literature main influencing parameters on the permeation process of small molecules, such as solubility of the permeating substances, [6] molecular weight and molecular volume, and the permeation area, [9][10][11] were published. Also, density, chain mobility, and crosslink density were characterized as influencing parameters of the polymer on the permeation process.…”

“…The diffusion coefficient decreases with increasing permeant weight, size (molecular volume) and cross-sectional area of the penetrant. [9][10][11] The shape of the permeant has been reported to have a profound effect on diffusion. [10,11], For example, permeants with linear, flexible, and symmetrical molecules have higher mobility than rigid molecules.…”