DEVELOPMENT OF NEW POLYMERS FOR AIRCRAFT APPLICATION
Abstract
Chloroprene-methacrylic acid copolymers: Air curing with Goodyear accelerator 983-C and diaminodiphenylmethane (DADPM) produced the least rain- erosive specimens. Panels cured with ZnO had poor erosion resistance; C black reduced the erosion resistance. No correlation was detected between erosion resistance and creep behaviour. Bubbling was observed when rain-erosion specimens were immersed in Hsub2O at 30 deg C for 24 hrs, particularly for specimens containing SiOsub2 in addition to ethyl Zimate and DADPM. Less bubling occurred with MgO-cured samples. Copolymer-coated 3S-Al panels showed satisfactory over-all resistance to weathering after an 11-mo exposure. Adhesion was satisfactory, but the specimens lost their gloss. Chloroprene-methacrylamide copolymers: Comparable cures were obtained with 6 parts Zimate, 2 parts MgO, and 2 parts S after baking for 1, 2, and 3 hrs at 120 deg C. Air-cured specimens had lower tensile values than high-temperature-cured materials. Royal Spectra and EPC blacks decreased the tensile strength without materially affecting the elongation or set. The chloroprene-methacrylamide lacquer which was stored without curing agents showed no deterioration after aging for 1 mo; it was stable for 1 wk with the curing system. Grafted copolymers were prepared for milling. The Bostik primer provided the best undercoat system for the copolymer.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1952
- Accession Number
- AD0002606
Entities
People
- Albert Haefner
- Henno Keskkula
- John Adams
Organizations
- University of Cincinnati