Self-seeding in one dimension: A route to uniform fiber-like nanostructures from block copolymers with a crystallizable core-forming block

Qian，Jieshu1; Lu，Yijie1; Chia，Anselina1; Zhang，Meng1; Rupar，Paul A.2,3; Gunari，Nikhil1; Walker，Gilbert C.1; Cambridge，Graeme1; He，Feng1,4; Guerin，Gerald1; Manners，Ian2; Winnik，Mitchell A.1

2013-05-28

10.1021/nn400124x

ACS Nano   影响因子和分区

1936-0851

1936-086X

One-dimensional micelles formed by the self-assembly of crystalline-coil poly(ferrocenyldimethylsilane) (PFS) block copolymers exhibit self-seeding behavior when solutions of short micelle fragments are heated above a certain temperature and then cooled back to room temperature. In this process, a fraction of the fragments (the least crystalline fragments) dissolves at elevated temperature, but the dissolved polymer crystallizes onto the ends of the remaining seed fragments upon cooling. This process yields longer nanostructures (up to 1 μm) with uniform width (ca. 15 nm) and a narrow length distribution. In this paper, we describe a systematic investigation of factors that affect the self-seeding behavior of PFS block copolymer micelle fragments. For PI-PFS (the subscripts refer to the number average degree of polymerization) in decane, these factors include the presence of a good solvent (THF) for PFS and the effect of annealing the fragments prior to the self-seeding experiments. THF promoted the dissolution of the micelle fragments, while preannealing improved their stability. We also extended our experiments to other PFS block copolymers with different corona-forming blocks. These included PI-PFS in decane, PFS-PDMS in decane (PDMS = polydimethylsiloxane), and PFS-P2VP in 2-propanol (P2VP = poly(2-vinylpyridine)). The most remarkable result of these experiments is our finding that the corona-forming chain plays an important role in affecting how the PFS chains crystallize in the core of the micelles and, subsequently, the range of temperatures over which the micelle fragments dissolve. Our results also show that self-seeding is a versatile approach to generate uniform PFS fiber-like nanostructures, and in principle, the method should be extendable to a wide variety of crystalline-coil block copolymers. © 2013 American Chemical Society.

block copolymers crystalline-coil self-seeding

SCI ; EI

英语

NI期刊

其他

WOS:000319856300013

American Chemical Society

20132316392810

Crystalline materials ; Micelles ; Nanostructures ; Organic solvents ; Paraffins ; Silicones

Nanotechnology:761 ; Colloid Chemistry:801.3 ; Chemical Agents and Basic Industrial Chemicals:803 ; Polymeric Materials:815.1 ; Organic Polymers:815.1.1 ; Solid State Physics:933 ; Crystalline Solids:933.1

2-s2.0-84878293912

Scopus

1.Department of Chemistry,University of Toronto,80 St. George Street,Toronto, ON M5S 3H6,Canada
2.School of Chemistry,University of Bristol,Bristol BS8 1TS,United Kingdom
3.Department of Chemistry,University of Alabama,Tuscaloosa, AL 35487,United States
4.South University of Science and Technology of China,1088 Xueyuan Boulevard,Xili, Nanshan, Shenzhen 518055,China

Qian，Jieshu,Lu，Yijie,Chia，Anselina,et al. Self-seeding in one dimension: A route to uniform fiber-like nanostructures from block copolymers with a crystallizable core-forming block[J]. ACS Nano,2013,7(5):3754-3766.

Qian，Jieshu.,Lu，Yijie.,Chia，Anselina.,Zhang，Meng.,Rupar，Paul A..,...&Winnik，Mitchell A..(2013).Self-seeding in one dimension: A route to uniform fiber-like nanostructures from block copolymers with a crystallizable core-forming block.ACS Nano,7(5),3754-3766.

Qian，Jieshu,et al."Self-seeding in one dimension: A route to uniform fiber-like nanostructures from block copolymers with a crystallizable core-forming block".ACS Nano 7.5(2013):3754-3766.