Synthesis of biodegradable material poly(lactic acid-co-glycerol) via direct melt polycondensation and its reaction mechanism

2011 ◽  
Vol 18 (6) ◽  
pp. 2093-2102 ◽  
Author(s):  
Shi-He Luo ◽  
Zhao-Yang Wang ◽  
Chao-Xu Mao ◽  
Jing-Pei Huo
Keyword(s):  
Lactic Acid ◽  
Reaction Mechanism ◽  
Poly Lactic Acid ◽  
Biodegradable Material ◽  
Melt Polycondensation ◽  
Direct Melt Polycondensation

Synthesis of a Biodegradable Material Poly(lactic acid-co-melamine) via Direct Melt Polycondensation

2013 ◽  
Vol 781-784 ◽  
pp. 503-506
Author(s):  
Min Hua Feng ◽  
Jin Feng Xiong ◽  
Qun Fang Wang ◽  
Zhao Yang Wang
Keyword(s):  
Lactic Acid ◽  
Flame Retardant ◽  
Stannous Chloride ◽  
Feed Ratio ◽  
Poly Lactic Acid ◽  
Biodegradable Material ◽  
Melt Polycondensation ◽  
Melt Copolymerization ◽  
Molar Feed Ratio ◽  
Direct Melt Polycondensation

Directly starting fromD,L-lactic acid (LA) and melamine (MA), novel star-shaped biodegradable material poly (lactic acid-co-melamine) [P(LA-co-MA)] as a kind of potential flame retardant is synthesized via melt polycondensation. When the molar feed ration(LA)/n(MA) is 60/1, the optimal synthetic conditions are discussed. After the prepolymerization at 140 °C for 8 h, using 0.4wt% stannous chloride as the catalyst, the melt copolymerization at 160 °C for 8 h gives the copolymer with the biggest intrinsic viscosity 0.87 dLg-1.

Research on the Modification of Poly(L-Lactic Acid) by Glucose via Direct Melt Polycondensation

2011 ◽  
Vol 311-313 ◽  
pp. 1106-1109 ◽  
Author(s):  
Shi He Luo ◽  
Shi Qin Yu ◽  
Jian Xiao Li ◽  
Zhao Yang Wang
Keyword(s):  
Drug Delivery ◽  
Lactic Acid ◽  
Feed Ratio ◽  
Biodegradable Material ◽  
Drug Delivery Application ◽  
H Nmr ◽  
Melt Polycondensation ◽  
Molar Feed Ratio ◽  
Direct Melt Polycondensation

Directly using L-lactic acid (L-LA) and glucose (Glu) as the starting materials, novel biodegradable material poly(L-lactic acid-co-glucose) [P(L-LA-co-Glu)] was synthesized via direct melt polycondensation. The copolymers P(L-LA-co-Glu)s at different molar feed ratios were characterized by FTIR,1H-NMR, GPC, DSC and XRD. All poly(L-lactic acid) modified by Glu was partly crystalline. And their Mw, Tm, and crystallinity basically increased with the increase of the molar feed ratio n(L-LA) : n(Glu). When n(Glu) : n(L-LA) was 1 : 750, the biggest Mw was 5900 Da, and all Mwcould meet the requirement for drug delivery application.

Synthesis of poly(lactic acid-co-menthol) via direct melt polycondensation and its characterization

2012 ◽  
Vol 125 (S2) ◽  
pp. E339-E346 ◽  
Author(s):  
Chao-Xu Mao ◽  
Shi-He Luo ◽  
Qun-Fang Wang ◽  
Jin-Feng Xiong ◽  
Zhao-Yang Wang
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Melt Polycondensation ◽  
Direct Melt Polycondensation

Reaction Mechanism on the Modification of PLA by Melamine via DMP

2013 ◽  
Vol 781-784 ◽  
pp. 495-498
Author(s):  
Qun Fang Wang ◽  
Jin Feng Xiong ◽  
Ming Li Zhong ◽  
Zhao Yang Wang
Keyword(s):  
Lactic Acid ◽  
Functional Groups ◽  
Core Structure ◽  
Feed Ratio ◽  
Poly Lactic Acid ◽  
Internal Factors ◽  
Melt Polycondensation ◽  
Molar Feed Ratio ◽  
Direct Melt Polycondensation ◽  
Peak Value

When poly (lactic acid-co-melamine) [P(LA-co-MA)] is synthesized via direct melt polycondensation (DMP), with the more MA in the feed content, the copolymer with a three-MA-core structure linked by the ether bond is formed. Increasing the molar feed ration(LA)/n(MA), the structure of the copolymers is gradually changed from multi-core structure into SPLA structure only containing one MA core, and a peak value of Mwexists as expected. The aromatic cores with different functional groups have an important influence on the Mwpeak value, and the internal factors are the conjugate effect and the nucleophilicity caused by the different functional groups themselves.

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