Nonisothermal crystallization behavior of the poly(ethylene glycol) block in poly(L-lactide)–poly(ethylene glycol) diblock copolymers: Effect of the poly(L-lactide) block length

2006 ◽  
Vol 44 (22) ◽  
pp. 3215-3226 ◽  
Author(s):  
Junliang Yang ◽  
Ting Zhao ◽  
Jijun Cui ◽  
Leijing Liu ◽  
Yunchun Zhou ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Crystallization Behavior ◽  
Diblock Copolymers ◽  
Block Length ◽  
Poly Ethylene Glycol ◽  
Nonisothermal Crystallization ◽  
Poly Ethylene

Mechanical properties and hydrolytic degradation of methoxy poly(ethylene glycol)-b-poly(DL-lactide-coglycolide- co-ε-caprolactone) diblock copolymer films

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Nongnit Morakot ◽  
Jirasak Threeprom ◽  
Yodthong Baimark
Keyword(s):  
Mechanical Properties ◽  
Weight Loss ◽  
Ethylene Glycol ◽  
Diblock Copolymers ◽  
Hydrolytic Degradation ◽  
Size Exclusion ◽  
Block Length ◽  
Poly Ethylene Glycol ◽  
Scanning Calorimetry ◽  
Poly Ethylene

AbstractBiodegradable films of methoxy poly(ethylene glycol)-b-poly(DL-lactideco- glycolide-co-ε-caprolactone) diblock copolymers (MPEG-b-PDLLGCL) were prepared by solution casting method. Effects of MPEG block length and DLL:G:CL ratio of the MPEG-b-PDLLGCL films on their mechanical properties and hydrolytic degradation were studied and discussed. It was found that the mechanical properties of films were strongly dependent on glass transition temperatures (Tg) of the diblock copolymers. The hydrolytic degradation was investigated in phosphatebuffered solution at 37°C. The degraded films were characterized using gravimetry (%water uptake and %weight loss), 1H-NMR spectroscopy, differential scanning calorimetry and size exclusion chromatography. The %weight loss of the degraded films increased and molecular weight decreased on increasing the MPEG block length and incorporating the G and CL units, according to their %water uptakes. The MPEG content of the degraded film decreased and the Tg increased with hydrolytic degradation time.

Microencapsulation of cytarabine using poly(ethylene glycol)–poly(ε-caprolactone) diblock copolymers as surfactant agents

2010 ◽  
Vol 36 (4) ◽  
pp. 456-469 ◽  
Author(s):  
Roudayna Diab ◽  
Misara Hamoudeh ◽  
Olivier Boyron ◽  
Abdelhamid Elaissari ◽  
Hatem Fessi
Keyword(s):  
Ethylene Glycol ◽  
Diblock Copolymers ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene
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