新的四(氟烷基)(硅烷,R 1 R 2 R 3 R 4 Si [其中R i =(CH 2)n R F,n = 2或3,R F为全氟链,直链或直链)的合成和结构表征R 1 R 2 R 3 SiR'SiR 1 R 2 R 3 [R i = Me,-(CH 2)n R F和R'=-(CH 2)n R报告了F '(CH 2)n-。DSC已研究了这些新化合物的热性能以及先前制备的所有硅烷和乙硅烷的热性能。还给出了它们的折射率。
Study of the alkylation of chlorosilanes. Part IV. Influence of the introduction of branched chains on the synthesis and properties of tetra(fluoroalkyl)-silanes and α,ω-fluoroalkylene disilanes
The synthesis and structural characterization of new tetra(fluoroalkyl (silanes, R1R2R3R4Si [where Ri= (CH2)nRF, n = 2 or 3, RF is a perfluorinated chain, linear or branched], and α,ω-fluoroalkylene disilanes, R1R2R3SiR′SiR1R2R3 [Ri = Me, -(CH2)nRF and R′= - (CH2)nRF′(CH2)n- are reported. The thermal properties of these new compounds together with those of all the silanes and disilanes previously prepared
新的四(氟烷基)(硅烷,R 1 R 2 R 3 R 4 Si [其中R i =(CH 2)n R F,n = 2或3,R F为全氟链,直链或直链)的合成和结构表征R 1 R 2 R 3 SiR'SiR 1 R 2 R 3 [R i = Me,-(CH 2)n R F和R'=-(CH 2)n R报告了F '(CH 2)n-。DSC已研究了这些新化合物的热性能以及先前制备的所有硅烷和乙硅烷的热性能。还给出了它们的折射率。
Physically crosslinked fluorosilicone elastomers obtained by self- assembly and template polycondensation of tailored building blocks
Self-assembly and template polycondensation of two tailor-made fluorinated oligocarbosiloxanes generated physically crosslinked elastomer-like materials (denoted here as “gelastomers”). Clustering was found to arise from phase separation between strongly aggregated, polar silanol chain-ends and highly hydrophobic fluorosilicone domains. The large concentration of silanol functions promoted a template catalyst-free co-condensation to generate chains of typically 10 000 g mol−1 after extended times. One of these gelastomers exhibited noteworthy mechanical properties, such an elongation as large as 1500% at a fair strain force (0.2 MPa).
两种定制的氟化寡碳硅氧烷的自组装和模板缩聚产生了物理交联的弹性体状材料(在此称为“凝胶体”)。研究发现,聚集是由强聚集的极性硅羟基链端与高度疏水的氟硅氧烷域之间的相分离引起的。硅羟基的大量聚集促进了无模板催化剂的共缩聚,经过长时间后,通常会产生10000 g mol-1的链。其中一种凝胶体表现出显著的机械性能,在相当大的应变力(0.2 MPa)下,伸长率高达1500%。