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Mechanical and processing requirements for a shock mitigating phenolic foam
Author(s) -
Mendelsohn M. A.,
Meier J. F.,
Rudd G. E.,
Rosenblatt G. B.
Publication year - 1979
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1979.070230203
Subject(s) - pulmonary surfactant , materials science , phosphoric acid , composite material , foaming agent , sulfuric acid , fluorocarbon , chemical engineering , porosity , metallurgy , engineering
A high load‐bearing shock‐mitigating phenolic foam was developed to meet specific compression‐deflection and gas permeability requirements. It was required that the foam display an almost constant compressive stress within the limits of 50–68 psi at strains ranging from 10% to 60%. Furthermore, the foam had to possess a highly open‐celled structure so that its resistance to gas flow would be minimal. These properties were obtained from a chemical formulation utilizing a combination of two phenolic resins, a phosphoric‐sulfuric acid catalyst system, a surfactant combination that included both a hydrophilic and a lipophilic surfactant, and a fluorocarbon blowing agent.