链段长度对嵌段多肽控制合成SiO2影响

In this paper ，triblock copolymers PBLGn-PEG-PBLGn （n=40,60,80） with different length of PBLG segment were used as templates to control the synthesis of silica, where anilino-methyl triethoxy silane (AMTS) acted as a bridge. When the polymerization degree of PBLG n=40, the surface of obtained microporous material possessed some small pits caused from phase separation and fingerprint-like patterns. This unusual surface morphology may be related to the self-assembly directed by secondary structure of PBLG segments. When n=60, the synthesized silica had small pits with uniform size on the surface and partly interconnected macropores inside. When n=80, the uniform three-dimension (3D) interconnected macroporous silica was obtained. The phase separation between PBLG segments and PEG segments and solvents was responsible for the macroporous structure. With the increase of the polymerization degree n, BET surface area and micropore volume of the prepared silica decreased. The results suggest a novel method to control nanoporous silica materials with new interior structures according to the different polypeptide segment length in triblock copolymers.