Abstract
Abstract Diffusion coefficients at zero concentration, D0, for hydrocarbon vapors in natural rubber have been determined, and their dependence on the size and shape (or length) of the penetrants has been reexamined. For normal hydrocarbons, D0 decreased gradually with increasing the number of carbon atoms up to 5 and then leveled off. For branched hydrocarbons, such as iso- and neo-paraffins, D0 was considerably lower than that for the corresponding normal ones. The dependence of D0 on the size and shape of penetrants could be explained by assuming that the principal resistance to diffusion is defined by the cross-sectional area at the most bulky portion of the major axis and also that an additional resistance due to the molecular length contributes for relatively lower hydrocarbons. The latter resistance was practically negligible for hydrocarbons with more than 4 carbon atoms in the major chain. The effective cross-sectional dimension could be estimated successfully in terms of the group dimension of Pauling.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
