Accession Number : AD0002606


Title :   DEVELOPMENT OF NEW POLYMERS FOR AIRCRAFT APPLICATION


Descriptive Note : Progress rept. no. 5, 1 Aug 1952-30 Sep 1952


Corporate Author : CINCINNATI UNIV OH APPLIED SCIENCE RESEARCH LAB


Personal Author(s) : ADAMS, JOHN ; HAEFNER, ALBERT ; KESKKULA, HENNO


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/002606.pdf


Report Date : 30 Sep 1952


Pagination or Media Count : 23


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.


Descriptors :   *AIRCRAFT , *PLASTIC COATINGS , TENSILE STRENGTH , AIR , RESISTANCE , TENSILE PROPERTIES , ADHESION , COPOLYMERS , CREEP , VALUE , CURING , CURING AGENTS , DETERIORATION , ELONGATION , ETHYL RADICALS , BLACK(COLOR) , WEATHERING , RAIN EROSION , EROSION RESISTANCE


Subject Categories : Coatings, Colorants and Finishes
      Plastics


Distribution Statement : APPROVED FOR PUBLIC RELEASE