Regulation of Two-Dimensional Platelet Micelles with Tunable Core Composition Distribution via Coassembly Seeded Growth Approach
Liping Liu,
Xiancheng Meng,
Meili Li
et al.
Abstract:Seeded growth termed "living" crystallization-driven selfassembly (CDSA) has been identified as a powerful method to create oneor two-dimensional nanoparticles. Epitaxial crystallization is usually regarded as the growth mechanism for the formation of uniform micelles. From this perspective, the unimer depositing rate is largely related to the crystallization temperature, which is a key factor to determine the crystallization rate and regulate the core composition distribution among nanoparticles. In the prese… Show more
The investigation of the amorphous
to crystalline transformation
and the corresponding influence on the self-assembly behavior of amphiphilic
polymers are of significant interest in this field. Herein, we propose
the concept of intramolecular cyclization-induced self-assembly (ICISA)
to prepare crystalline nanoflowers at a high solid content of 15%
on the basis of the amorphous to crystalline transformation of poly(amic
acid) (PAA). Taking advantage of the reactive property of the PAA,
rigid and crystalline polyimide (PI) segments are introduced to the
backbone of the PAA to give P(AA-stat-I) induced
by the intramolecular cyclization reaction upon thermal treatment,
leading to the in situ formation of crystalline nanoflowers. Revealing
the formation mechanism of the nanoflowers, we found that the nanosheets
are formed at the early stage and then stacked to form the nanoflowers
at high concentrations. The relationship between the degree of imidization
and incubation temperature is quantitatively analyzed, and the effects
of temperature on the morphology, degree of imidization, and crystallinity
of the assemblies are also investigated. Furthermore, computer simulations
demonstrate the optimized temperature of ICISA of 160 °C, which
ensures the match between the intramolecular cyclization reaction
rate, the self-assembly process, and the lowest energy state of the
self-assembly system, resulting in the formation of nanoflowers with
high crystallinity. Overall, a facile one-step strategy is proposed
to prepare crystalline nanoflowers based on the in situ thermally
triggered intramolecular cyclization reaction of a PAA, which may
bring fresh insights into the dynamic amorphous to the crystalline
transformation of polymers.
The investigation of the amorphous
to crystalline transformation
and the corresponding influence on the self-assembly behavior of amphiphilic
polymers are of significant interest in this field. Herein, we propose
the concept of intramolecular cyclization-induced self-assembly (ICISA)
to prepare crystalline nanoflowers at a high solid content of 15%
on the basis of the amorphous to crystalline transformation of poly(amic
acid) (PAA). Taking advantage of the reactive property of the PAA,
rigid and crystalline polyimide (PI) segments are introduced to the
backbone of the PAA to give P(AA-stat-I) induced
by the intramolecular cyclization reaction upon thermal treatment,
leading to the in situ formation of crystalline nanoflowers. Revealing
the formation mechanism of the nanoflowers, we found that the nanosheets
are formed at the early stage and then stacked to form the nanoflowers
at high concentrations. The relationship between the degree of imidization
and incubation temperature is quantitatively analyzed, and the effects
of temperature on the morphology, degree of imidization, and crystallinity
of the assemblies are also investigated. Furthermore, computer simulations
demonstrate the optimized temperature of ICISA of 160 °C, which
ensures the match between the intramolecular cyclization reaction
rate, the self-assembly process, and the lowest energy state of the
self-assembly system, resulting in the formation of nanoflowers with
high crystallinity. Overall, a facile one-step strategy is proposed
to prepare crystalline nanoflowers based on the in situ thermally
triggered intramolecular cyclization reaction of a PAA, which may
bring fresh insights into the dynamic amorphous to the crystalline
transformation of polymers.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.