N'afọ 1938, mgbe Carothers nwụsịrị, Flory kwagara na Basic Science Research Laboratory na Mahadum Cincinnati. N'ebe ahụ, o mepụtara usoro mgbakọ na mwepụ maka polymerization nke ogige nwere ihe karịrị ìgwè abụọ na-arụ ọrụ na usoro nke netwọk polymer ma ọ bụ gels. Nke a dugara na usoro Flory-Stockmayer nke gelation, nke kwekọrọ na percolation na Bethe lattice na n'eziokwu na-anọchite anya akwụkwọ mbụ na mpaghara percolation. Ajụjụ: Mgbe Carothers nwụrụ?
Afọ 1938