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1. A method of synthesizing a unimodal ethylene-co-1-hexene copolymer, the method consisting essentially of contacting ethylene and 1-hexene (“C6”) with a single catalyst system consisting of a unimodal chromium catalyst system in a single fluidized bed, gas-phase polymerization (FB-GPP) reactor under effective operating conditions comprising a reactor bed temperature (RBT), an average polymer residence time (avgPRT), and an ethylene partial pressure (C2P) and receiving an ethylene (C2) feed, a comonomer (1-hexene or “C6”) feed, a hydrogen (H2) feed, and, optionally, an oxygen (O2) feed wherein the feeds are characterized by a H2/C2 gas molar ratio (H2/C2), a comonomer/ethylene gas molar ratio (“C6/C2”), and a 02/C2 gas volume ratio (“[O2/C2]”, vol/vol in ppmv); wherein RBT is from 101° to 111° C.; avgPRT is from 1.70 to 3.10 hours, C2P is from 1,100 to 1,900 kilopascals (kPa); H2/C2 gas molar ratio is from 0.01 to 0.150; C6/C2 gas molar ratio is from 0.010 to 0.021; and O2/C2 gas volume ratio is from greater than 0 to 130 parts per billion volume/volume (ppbv); thereby synthesizing the unimodal ethylene-co-1-hexene copolymer in the FB-GPP reactor.
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