Amphiphilic biodegradable poly(CL-b-PEG-b-CL) triblock copolymers prepared by novel rare earth complex: Synthesis and crystallization properties

Preparation and characterization of thermosensitive pluronic F127-b-poly(ɛ-caprolactone) mixed micelles

“…Therefore, the increase of nucleation density led to the reducing of the size of the spherulites. The crystallization of CL is predominant along with the increase of CL so that the size becomes bigger [43]. The molecular weight determined by GPC increased with CL segments increasing as shown in Table 1, and the actual ratio of CL and F127 determined by 1 H NMR was almost identical with the feed ratio.…”

Ring-opening copolymerization of L-lactide and ɛ-caprolactone in supercritical carbon dioxide using triblock oligomers of caprolactone and PEG as stabilizers

“…These SBs, the average molecular weights (M n ) and heterogeneity indices (HI, in parentheses) of which were calculated from the gel permeation chromatography data to be 1380 (1.62), 2140 (1.80) and 2670 (2.26), respectively, were also used in the copolymerization of L-lactide with e-CL. [41][42] It is important to note that under the polymerization conditions (80 1C, 100 bar), all of the SBs were partially soluble (they form cloudy mixtures in the reactor) and their solubilities were inversely proportional to their molecular weight. 41 Because of their triblock structure, the SBs are expected to adopt a U shape in scCO 2 .…”

“…The proper amount of triphenyl phosphine was added to the copolymerizaton medium to eliminate/reduce transesterification side reactions. 42 We were very careful to dry the whole system and remove any traces of water. The reactor was purged with carbon dioxide at room temperature and low pressure (65 bar) for 15 min.…”

Poly(ethylene glycol)-poly(tetrahydrofuran)-poly(ethylene glycol) triblock copolymer : Synthesis, crystallization behavior and novel morphology

“…Recently, with the comprehensive investigations on crystallization process for block copolymers, the high order structures containing crystal lamellae were frequently discovered [6,[21][22][23][24][25], where several types of spherulites with unusual morphologies such as ring banded spherulite, spherical granular aggregates and double concentric spherulites have been reported [14,15,[26][27][28][29][30][31]. Especially, the double concentric spherulites were only found in poly(ethylene oxide)/poly(!-caprolactone) PEG/PCL block copolymer up to now [14,[26][27][28][29]. This complex morphology contains an initial spherulite in center and a concentric outside spherulite with different crystal structure.…”