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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and dispersibility of poly(L-lactide)-grafted silica nanoparticle
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Preparation and dispersibility of poly(L-lactide)-grafted silica nanoparticle

机译：聚（L-丙交酯）接枝二氧化硅纳米粒子的制备与分散性

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摘要

To improve dispersibility of silica nanoparticle in organic solvents, the grafting of poly(L-lactide) (PLLA) onto silica nanoparticle surface by ring-opening polymerization of L-lactide (LA) was investigated in the presence of an amidine base catalyst. The ring-opening polymerization of LA successfully initiated in the presence of silica having amino groups (silica-NH _2) and an amidine base catalyst to give PLLA-grafted silica, but not in the presence of untreated silica (silica-OH). In the absence of the amidine base catalyst no ring-opening polymerization of LA even in the presence of silica-NH _2 and no grafting of PLLA onto silica were observed. It became apparent that the amidine base catalyst acts as an effective catalyst for the ring-opening graft polymerization of LA from the surface of silica-NH _2. In addition, it was found that the percentage of PLLA grafting onto silica could be controlled according to the reaction conditions. The average particle size of PLLA-grafted silica was smaller than that of silica-NH _2. Therefore, it was considered that the aggregation structure of silica nanoparticles was considerably destroyed by grafting of PLLA onto the surface. The PLLA-grafted silica gave a stable dispersion in polar solvents, which are good solvents for PLLA.
机译：为了提高二氧化硅纳米颗粒在有机溶剂中的分散性，研究了在idine碱催化剂存在下，通过L-丙交酯（LA）的开环聚合将聚（L-丙交酯）（PLLA）接枝到二氧化硅纳米颗粒表面上。在具有氨基的二氧化硅（二氧化硅-NH _2）和idine碱催化剂的存在下，LA的开环聚合成功地引发，得到了PLLA接枝的二氧化硅，但是在未处理的二氧化硅（二氧化硅-OH）的存在下则没有。在没有base基碱催化剂的情况下，即使在二氧化硅-NH _2存在下也没有观察到LA的开环聚合，也没有观察到PLLA接枝到二氧化硅上。显而易见的是，base基催化剂充当了从二氧化硅-NH _2表面进行LA的开环接枝聚合的有效催化剂。另外，发现可以根据反应条件控制接枝到二氧化硅上的PLLA的百分比。 PLLA接枝的二氧化硅的平均粒径小于二氧化硅-NH _2的平均粒径。因此，认为通过将PLLA接枝到表面上，二氧化硅纳米颗粒的聚集结构被相当大地破坏。 PLLA接枝的二氧化硅在极性溶剂中具有稳定的分散性，而极性溶剂是PLLA的良好溶剂。

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