Schwefelhaltige telechele mit SH bzw. CCH‐endgruppen

The reaction of 1,3‐benzenedithiol (1) with 1,4‐diethinyl‐benzene (2) at room temperature yields polymers with thio‐1,3‐phenylenethiovinylene‐1,4‐phenylenevinylene repeating units. The polymerization proceeds without addition of an initiator and without UV‐irridiation. Because of the resulting structure a radical mechanism is suggested. However, the molar mass/conversion relation shows similarities with a step‐growth polymerization. Because of this behaviour this reaction was successfully used for the preparation of telechelics in which molar mass and end groups are controlled simply by the unstoichiometric ratio of the educts.