Liquid Crystalline and Light Emitting Polyacetylenes: Synthesis and Properties of Biphenyl-Containing Poly(1-alkynes) with Different Functional Bridges and Spacer Lengths
作者:Jacky W. Y. Lam、Yuping Dong、Kevin K. L. Cheuk、Jingdong Luo、Zhiliang Xie、Hoi Sing Kwok、Zhishen Mo、Ben Zhong Tang
DOI:10.1021/ma011406e
日期:2002.2.1
Biphenyl- (Biph-) containing 1-alkynes (3 and 4) and their polymers (1 and 2) with varying bridge groups and spacer lengths were synthesized and the effects of the structural variation on their properties, especially their mesomorphism and photoluminescence behaviors, were studied. The acetylene monomers 3(3) [HC⋮C(CH2)3O−Biph−OCO(CH2)10CH3] and 4(m) [HC⋮C(CH2)mOCO−Biph−OCO(CH2)10CH3, m = 3, 4] were
合成了具有不同桥基和间隔基长度的含1-炔烃(3和4)的联苯(Biph-)及其聚合物(1和2),并且结构变化对它们的性能,特别是其同构和光致发光行为的影响,被研究了。乙炔单体3(3)[HC⋮C(CH 2)3 O-Biph-OCO(CH 2)10 CH 3 ]和4(m)[HC⋮C(CH 2)m OCO-Biph-OCO(CH)2)10 CH 3,米= 3,4]通过1-炔烃的顺序醚化和酯化反应制备。虽然3(3)表现出对映晶体E和SmB中间相,但其结构表亲4(3)仅表现出单向性SmB相。然而,当间隔基长度增加到4时,会产生对映SmA和SmB中间相。单体的聚合是通过Mo-,W-,Rh-和Fe-基催化剂以及WCl 6 -Ph 4 Sn催化剂实现的给出最佳结果(隔离率高达85%,M w高达59000)。通过IR,UV,NMR,TGA,DSC,POM,XRD和PL分析来表征聚合物。相较于1(3),2(3)显示出红移吸收,较高的T