Synthesis And The Properties Of The Self-assembly Of Crown Ether Containing Poly (P-phenylenevinylene) (C-PPV) And PS-C-PPV-PS Triblock Copolymers

A soluble PPV (C-PPV), substituted with a crown ether in direct e-conjugation at the 2,3-position, has been synthesized via a Gilch route. Aggregation can be formed through the assembling of C-PPV induced by K+ions in chloroform. The morphological structure of the aggregation has been studied by AFM, and the formation of the aggregation is proved using UV absorption (UV) and photoluminescence (PL)spectrophotometers. The formation mechanism for the C-PPV aggregation we proposed is: complex between K+ and the crown ether derivatives in the C-PPV brings two polymer chains closer together, and the K+ ions create interpolymer bridges, forming aggregations in the solution. The influence the amount of K+ ions, the time after the addition of K+ ions to the C-PPV chloroform solution and the concentration of the C-PPV solution to the morphological structure of the aggregations and the spectrophotometers of the solution are studied, and the results are followed:1. The amount of K+ ions added to the C-PPV chloroform solution increases, the morphological structure of the aggregations changes from nanorods (~80nm in length) to nanoribbons (~400nm in length).2. The length of the aggregation formedincreases with the time after the K+ ions have been added to the C-PPV chloroform solution.3. The morphological structure of the aggregations and the spectrophotometers of the solution would not be influenced by the concentration of the C-PPV solution.Meanwhile, triblock copolymers containing C-PPV polystyrene-C-PPV-polystyrene (Ps-C-PPV-Ps) is prepared by atom transfer radical polymerization (ATRP) using C-PPV as the initiator, styrene as the monomer. We firstly report that the terminated group of the C-PPV prepared through the Gilch route is benzyl halide. The assembling ofPs-C-PPV-Ps induced by K+ ions in chloroform is also studied in compared to the C-PPV. The length of the aggregation formed is much less than the ones of C-PPV. The result can prove that the formation mechanism of the aggregation of the C-PPV in the presence of K+ ions we proposed is right: one K+ ions attracts two crown ethers in two C-PPV molecules, forming complex and bringing the two molecules close, thus forming the aggregation. At the end of the aggregation, the crown ethers left can also form complex with K+ ions and crown ethers in another C-PPV molecule, making the aggregation can grow to hundreds of nanometers. The spectrophotometers of Ps-C-PPV-Ps show the same results as the C-PPV.