Temperature-induced spontaneous sol-gel transitions of poly(D,L-lactic acid-co-glycolic acid)-b-poly(ethylene glycol)-b-poly(D,L-lactic acid-co-glycolic acid) triblock copolymers and their end-capped derivatives in water

2007 ◽  
Vol 45 (6) ◽  
pp. 1122-1133 ◽  
Author(s):  
Lin Yu ◽  
Guangtao Chang ◽  
Huan Zhang ◽  
Jiandong Ding
Keyword(s):  
Lactic Acid ◽  
Ethylene Glycol ◽  
Glycolic Acid ◽  
Triblock Copolymers ◽  
Sol Gel ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

Controlled Hierarchical Pore Structures in Ethylene-Bridged Polysilsesquioxane Gels

2003 ◽  
Vol 788 ◽  
Author(s):  
Yuki Kobayashi ◽  
Kazuki Nakanishi ◽  
Kazuyuki Hirao
Keyword(s):  
Phase Separation ◽  
Ethylene Glycol ◽  
Triblock Copolymers ◽  
Sol Gel ◽  
Poly Ethylene Glycol ◽  
Bridged Polysilsesquioxane ◽  
Sol Gel Transition ◽  
Poly Ethylene ◽  
Hierarchical Pore ◽  
Gel Transition

ABSTRACTFormation of hierarchical macropores and mesopores in ethylene-bridged polysilsesquioxane sol-gel systems via concurrent sol-gel transition and phase separation induced by the incorporation of supramolecular templats has been investigated. A series of poly(ethylene-glycol)-poly(propyleneglycol)- poly(ethyleneglycol) triblock copolymers, EOPOEOs, have been employed as supramolecular templates, while 1,2-bis(trimethoxysilyl)ethane was used as a polysilsesquioxane source. Successful combination of templated mesopores and well-defined macropores due to phase-separation has been found in the system with EOPOEOs having 70 PO units and respective 20 EO units. Although similar macroporous morphology has been obtained for all the EOPOEOs with EO chain longer or shorter than 20 units, the optimum composition for the co-continuous macropores and that for templated mesopores deviated from each other, resulting in the failure of producing hierarchical macropores and mesopores.

Poly(lactic acid)/poly(ethylene glycol) stereocomplexed physical hydrogels showing thermally-induced gel–sol–gel multiple phase transitions

2018 ◽  
Vol 2 (2) ◽  
pp. 313-322 ◽  
Author(s):  
Hailiang Mao ◽  
Chen Wang ◽  
Xiaohua Chang ◽  
Heqing Cao ◽  
Guorong Shan ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Phase Transitions ◽  
Ethylene Glycol ◽  
Sol Gel ◽  
Poly Lactic Acid ◽  
Poly Ethylene Glycol ◽  
Thermally Induced ◽  
Multiple Phase ◽  
Poly Ethylene

A novel thermogel exhibiting unique thermally-induced gel–sol–gel multiple phase transitions was obtained by controlling the compositions of PLA/PEG copolymers.

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