Facile Preparation Route for Nanostructured Composites: Surface-Initiated Ring-Opening Polymerization of ε-Caprolactone from High-Surface-Area Nanopaper

被引:40
作者
Boujemaoui, Assya [1 ,3 ]
Carlsson, Linn [1 ]
Malmstrom, Eva [1 ]
Lahcini, Mohammed [3 ]
Berglund, Lars [1 ,2 ]
Sehaqui, Houssine [1 ]
Carlmark, Anna [1 ]
机构
[1] KTH Royal Inst Technol, Sch Chem Sci & Engn, SE-10044 Stockholm, Sweden
[2] Wallenberg Wood Sci Ctr, SE-10044 Stockholm, Sweden
[3] Cadi Ayyad Univ, Fac Sci & Technol, Lab Organometall & Macromol Chem Composite Mat, Marrakech 40000, Morocco
基金
瑞典研究理事会;
关键词
ring-opening polymerization; nanofibrillated cellulose; nanopaper; surface grafting; high surface area; MICROFIBRILLATED CELLULOSE; GRAFT LENGTH; MECHANISM; POLY(EPSILON-CAPROLACTONE); NANOCRYSTALS; TOUGHNESS; ACID);
D O I
10.1021/am300537h
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In this work, highly porous nanopaper, i.e., sheets of papers made from non-aggregated nanofibrillated cellulose (NFC), have been surface-grafted with poly(epsilon-caprolactone) (PCL) by surface-initiated ring-opening polymerization (SI-ROP). The nanopaper has exceptionally high surface area (similar to 300 m(2)/g). The "grafting from" of the nanopapers was compared to "grafting from" of cellulose in the form of filter paper, and in both cases either titanium n-butoxide (Ti(On-Bu)(4)) or tin octoate (Sn(Oct)(2)) was utilized as a catalyst. It was found that a high surface area leads to significantly higher amount of grafted PCL in the substrates when Sn(Oct)2 was utilized as a catalyst. Up to 79 wt % PCL was successfully grafted onto the nanopapers as compared to filter paper where only 2-3 wt % PCL was grafted. However, utilizing Ti(On-Bu)4 this effect was not seen and the grafted amount was essentially similar, irrespectively of surface area. The mechanical properties of the grafted nanopaper proved to be superior to those of pure PCL films, especially at elevated temperatures. The present bottom-up preparation route of NFC-based composites allows high NFC content and provides excellent nanostructural control. This is an important advantage compared with some existing preparation routes where dispersion of the filler in the matrix is challenging.
引用
收藏
页码:3191 / 3198
页数:8
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