Study of the inclusion compounds formed between α-cyclodextrin and high molecular weight poly(ethylene oxide) and poly(ϵ-caprolactone)

Synthesis of biocompatible hybrid magnetic hollow spheres based on encapsulation strategy

“…As shown in Fig. 3, the pattern of CS-g-PEG/␣-CD particles was similar to that of complex of PEG/␣-CD inclusion (2Â = 20 • ), which has been reported to have a rod channel structure (Harada & Kamachi, 1990;Harada, Li, & Kamachi, 1993;Huang, Allen, & Tonelli, 1998), while the homoPEG crystalline peaks (2Â = 19.2 • and 23.3 • ) and ␣-CD crystalline peak (2Â = 21.5 • ) were absent. This implies that ␣-CD rings are stacked along the graft PEG chain axis to form a channel-type crystalline structure.…”

“…As a result, the CS-g-PEG/␣-CD complexes have both rod block (PEG-␣-CD inclusion) and coil block (ionized CS backbone). Jenekhe et al and Jiang et al have reported that the rod-like block in rod-coil system preferred parallel packing crowdedly and resulted in the formation of hollow spheres for necessary of the efficient spacefilling packing (Chen & Jiang, 2005;Duan & Chen, 2001;Duan et al, 2004;Harada et al, 1993;Huang et al, 1998;Jenekhe & Chen, 1998; Jenekhe & Chen, 1999;Kuang et al, 2003Kuang et al, , 2004 With the formation of insoluble PEG-␣-CD inclusion blocks, water became a selective solvent for the CS-g-PEG/␣-CD, so hollow spheres were formed. The expected structure of such an aggregate in aqueous solution is an inner PEG-␣-CD inclusion block surrounded by the protonated coil-like CS shell.…”

Thermomechanical behavior and nonisothermal crystallization kinetics of poly(ε-caprolactone) and poly(ε- caprolactone)/poly(N-vinylpyrrolidone) blends

“…It can be used in different biomedical applications, such as in scaffolds, tissue engineering, and for controlled release of drugs [1][2][3][4]. By now, many researchers have synthesized PCL copolymers or blends such as PCL/PEG [5], PCL/polysaccharides [6][7][8], PCL/PVC [9], as well as incorporated various functional groups into PCL [10,11]. Even some PCL-based organic-inorganic hybrid materials have also been synthesized by sol-gel method [12].…”

Crystallization, melting behavior, and wettability of poly(ε‐caprolactone) and poly(ε‐caprolactone)/ poly(N‐vinylpyrrolidone) blends

“…[18][19][20][21] However, its hydrophobic property and semicrystalline nature impart difficulties in developing more advanced biomaterials from PCL, 22,23 because hydrophobic property can lead to slow down degradation kinetics and lacking surface recognition functions for specific mucoadhesion or receptor recognition. [24][25][26] For improving the desired properties of PCL, many researchers have synthesized PCL copolymers or blends such as PCL/ PEG, 27 PCL/polysaccharides, [28][29][30] PCL/PVC, 31 as well as incorporated various functional groups into PCL. 32,33 Even some PCL-based organic-inorganic hybrid materials have also been synthesized by solgel method.…”