NATURE OF RUBBER REINFORCEMENT

RESEARCH CONDUCTED AT THE NATIONAL BUREAU OF STANDARDS ON THE NATURE OF RUBBER REINFORCEMENT IS DISCUSSED. IT HAS BEEN SHOWN THAT CERTAIN CRYSTALLINE ORGANIC COMPOUNDS CONTAINING A BETANAPHTHYL GROUP PRODUCE AN INCREASE IN THE STIFFNESS OR REINFORCEMENT OF VULCANIZED RUBBER. SUCH REINFORCEMENT IS NORMALLY OBTAINED BY MIXING A REINFORCING FILLER INTO THE RUBBER BEFORE VULCANIZATION. RESULTS SUPPORTING TWO THEORIES CONCERNING THE NATURE OF RUBBER REINFORCEMENT WITH MATERIALS SUCH AS CARBON BLACK ARE DISCUSSED: (1) CHEMICAL BONDS EXIST BETWEEN THE RUBBER AND THE FILLER, AND (2) THE REINFORCEMENT IS A PHYSICAL PHENOMENON ONLY. TESTS WERE PERFORMED ON VULCANIZED STRIPS 1 OR 2 MM IN THICKNESS AND 150 MM LONG BY 9MM WIDE INTRODUCING CRYSTALLINE COMPOUNDS CONTAINING A BETA-NAPHTHYL GROUP. OF THESE COMPOUNDS PHENYL BETA- NAPHTHYLAMINE (PBNA) PRODUCED THE MOST PROFOUND REINFORCEMENT. RESULTS OF CREEP AND TENSILE TESTS ARE REPORTED. THE INVESTIGATION SUGGESTS THAT REINFORCEMENT OF RUBBER IS A PHYSICAL PHENOMENON DETERMINED BY THE SURFACE AREA OF THE FILLER AND THE INTERFACIAL FORCES PER UNIT AREA BETWEEN THE FILLER AND THE RUBBER.

• Supplemental Notes:
  • Vol 52, No 3, PP 54-55, 1 PHOT
• Publication Date: 1968-3

Media Info

• Serial:
  • Dimensions Nbs /US/

Subject/Index Terms

• TRT Terms: Carbon black; Chemical bond; Creep; Fillers (Materials); Material reinforcement; Organic compounds; Rubber; Stiffness; Surface tension; Surfaces; Tension tests; Vulcanization
• Uncontrolled Terms: Surface area
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00216374
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 3 1994 12:00AM