CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2014
·Vol. 30
·期 5
·863-867
·
IF 1.119
Wang Huan,Yao Yuan,Han Lu,Che Shun’ai
Self-assembled triblock terpolymers have attracted intense attention in recent years because of their abundant variety of assembly mesostructure. We reported the synthesis of mesoporous silica materials with the amphiphilic ABC triblock terpolymer polyethylene-poly(ethylene oxide)-polycaprolactone(PE-PEO-PCL) as a template and tetraethoxysilane(TEOS) as a silica source. Increasing the hydrophilic head group(PEO) led to the decrease of packing parameter g , which gave rise to the mesophase transformation from a cylindrical two-dimensional hexagonal P 6 mm structure to a cage-type face centered cubic closed-packing mesostructure. This new templating route provided a new insight into the template factor governed inorganic-organic self-assembly mesophases.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2021
·
IF 5.875
Kang Wang,Zhi Li,Yiming Huang,YaotianTao,Xiao Liang,Xiaoqin Chu,Ning He,Shuangying Gui,Zhenbao Li
In this study, alkanes and sucrose esters are employed to investigate the influence of additives on lyotropic liquid crystal architecture. After molecular dynamic simulations and experiment characterization, we showed how the additives control the structure of LLCs. By controlling the polarity of additives, the phase behavior of LLCs can be engineered to form the required structure. Dissipative particle dynamics (DPD) is introduced for simulating the self-assembly of phytantriol (PT), providing intuitionistic images and structure information, which shows that additives with low-polarity complicate the internal structure of liquid crystal systems. Then the ternary phase diagrams of additives, PT, and water are constructed to systematically study the effects of additives on the phase behavior of LLCs. Consistent with DPD simulation results, there is a certain regularity in the effects of additives on the structure of liquid crystals. The difference in the structure of LLCs is due to the variability in the critical packing parameter (CPP) obtained by changing the polarity of additives. Our findings demonstrate that additives polarity is a key factor in LLCs structure, and may pave a promising avenue for novel LLCs development and translation, determining the self-assembly process and the resulting phase of LLCs.
研究领域:
材料科学
·
化学工程
·
胶体与表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2024
·
IF 4.1
Huangbing Xu,Teng Qiu,Haotian Shi,Xiaoqian Tian,Xiaoyu Li,Longhai Guo
RAFT-mediated polymerization-induced self-assembly (RAFT-PISA) has been undergoing fast development currently, promoting research toward more diverse morphologies and more cutting-edge applications. Herein, we demonstrate a polymerization-pH tailored RAFT-PISA (pH-PISA) process, which can conveniently harvest abundant nano/micro-scale morphologies using popular monomers N,N-dimethylacrylamide (DMAA) and diacetone acrylamide (DAAM). The process proceeded through ordinary RAFT dispersion polymerization in an aqueous medium but under different pH conditions. With the use of pH-sensitive bi-carboxylic acid-capped trithiocarbonate as the chain transfer agent (CTA), it was found that the PISA of propagating amphiphilic ABA triblock copolymers was highly affected by the different ionization of the CTA. When the polymerization pH was adjusted to 2.5, an especially wide spectrum of morphologies was detected, including spheres, worms, lamellae, single or double-head tadpoles, vesicle strings and large spheres with surface protrusions. However, the diversity in morphology gradually declined when the polymerization pH was increased to 6 or 8. Diverse structures with same monomer compositions provide an ideal model to explore the influence of particle morphology on ice recrystallization inhibition (IRI) activities. The variations in mean largest grain sizes (MLGS) and growth rates of a single ice crystal were related to packing parameters (P), bridging the interface geometry of the packing of amphiphilic molecules and ice-controlling activities.
研究领域:
高分子化学
·
材料科学
·
胶体与表面化学
·
低温生物学
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2024
·Vol. 15
·期 8
·733-741
·
IF 4.1
Yalan Sun,Zichao Deng,Aihua Chen
Polymer particles with inverse bicontinuous structures are widely used due to their well-defined ordered porous networks. These structures are typically prepared by the traditional self-assembly of amphiphilic block copolymers (BCPs) in solution or polymerization-induced self-assembly (PISA). In both methods, BCPs must be highly asymmetric with long hydrophobic chains. In this study, we report a credible approach where single-chain nanoparticles (SCNPs) preferentially self-assemble into inverse bicontinuous structures by folding the hydrophilic chains of BCPs, which can reduce the molecular area a0 and thus increase the packing parameter (P) to greater than unity. It is anticipated that this strategy will lessen the rigorous requirement of inverse bicontinuous structures on the BCP asymmetry. To illustrate this strategy, we prepared tadpole-like SCNPs of poly(4-vinylpyridine)-block-polystyrene (P4VP-b-PS) by intrachain cross-linking the P4VP blocks. Polymer cubosomes could be self-assembled from both linear BCPs and tadpole-like SCNPs, resulting in a distinct reduction in the minimal volume fractions of PS (fPS) (94.4% and 91.1%, respectively). A plausible formation mechanism for cubosomes was proposed. In addition, the efficiency of intrachain cross-linking and the property of the co-solvent played crucial roles in the formation of cubosomes. Overall, this work provides an effective method for preparing polymer particles with inverse bicontinuous structures from relatively low-asymmetric BCPs with a broad window.
研究领域:
高分子科学
·
材料科学
·
纳米技术
·
软物质物理
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）