Environmental-Friendly Catalyzed Synthesis of Poly(lactic acid-co-citric acid) by Macro Resin Solid Acid Using Direct Melt Polycondensation

2019 ◽  
Vol 11 (1) ◽  
pp. 74-80
Author(s):  
Hui-Xue Ren ◽  
Na Zhang ◽  
Dao-Ji Wu ◽  
Yaqi-Li ◽  
Ai-Jun Qi ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Citric Acid ◽  
Solid Acid ◽  
Poly Lactic Acid ◽  
Resin Solid ◽  
Melt Polycondensation ◽  
Environmental Friendly ◽  
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.

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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