scholarly journals Ring-Opening Polymerization of a New Diester Cyclic Dimer of Mandelic and Glycolic Acid: An Efficient Synthesis Method for Derivatives of Amorphous Polyglycolide with High T g

2018 ◽  
Vol 39 (12) ◽  
pp. 1700865 ◽  
Author(s):  
Hajime Nakajima ◽  
Katja Loos ◽  
Shinobu Ishizu ◽  
Yoshiharu Kimura
Keyword(s):  
Ring Opening ◽  
Glycolic Acid ◽  
Synthesis Method ◽  
Ring Opening Polymerization ◽  
Cyclic Dimer ◽  
Efficient Synthesis ◽  
Derivatives Of

Highly Regioselective Ring-Opening Polymerization of Cyclic Diester for Alternating Sequence-Controlled Copolymer Synthesis of Mandelic Acid and Glycolic Acid

2019 ◽  
Vol 52 (20) ◽  
pp. 7564-7571 ◽  
Author(s):  
Yaru Wang ◽  
Zhaowei Jia ◽  
Jinxing Jiang ◽  
Xiaoyang Mao ◽  
Xiaobo Pan ◽  
...  
Keyword(s):  
Ring Opening ◽  
Mandelic Acid ◽  
Glycolic Acid ◽  
Ring Opening Polymerization

Ring Opening Polymerization of ε-Caprolactone Catalyzed with Magnesium Lactate

2009 ◽  
Vol 610-613 ◽  
pp. 1208-1210 ◽  
Author(s):  
Lian Liu ◽  
Zhi Yong Wei ◽  
Pei Wang ◽  
Min Qi
Keyword(s):  
Nmr Spectroscopy ◽  
Reaction Temperature ◽  
13C Nmr ◽  
Ring Opening ◽  
Synthesis Method ◽  
13C Nmr Spectroscopy ◽  
Ring Opening Polymerization ◽  
Moderate Activity ◽  
Lactide Copolymers

The aim of this paper is to present a synthesis method of poly(ε-caprolactone) by the ring opening polymerization of ε-caprolactone catalyzed with nontoxic magnesium lactate. The results indicated that Mg(Lac)2 is a catalyst with moderate activity for the polymerization of ε-caprolactone. Effects of the catalyst and reaction temperatures on the microstructure of the ε-caprolactone and L-lactide copolymers were investigated by means of 13C-NMR spectroscopy. An increase in the reaction temperature enhances the role of transesterification and the extent of randomness.

Microwave-assisted ring-opening polymerization of poly (glycolic acid-co-lactic acid) copolymers

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Guang Li ◽  
Na Zhao ◽  
Wei Bai ◽  
Dong Liang Chen ◽  
Cheng Dong Xiong
Keyword(s):  
Lactic Acid ◽  
Ring Opening ◽  
Glycolic Acid ◽  
Raw Materials ◽  
Irradiation Time ◽  
Ring Opening Polymerization ◽  
Feed Ratio ◽  
Microwave Assisted Synthesis ◽  
Component Ratio ◽  
Microwave Assisted

AbstractThe microwave-assisted synthesis of poly(glycolic acid-co-lactic acid) (PGLA) copolymers by ring-opening polymerization of glycolide (GA) and L-lactide (L-LA) was studied. The microwave irradiation time and feed ratios on the molecular weights, as well as the thermal properties of the copolymers were discussed. These copolymers were characterized by 1H-NMR, GPC and DSC. It was found that the largest molecular weight ([η]: 0.8745 dL/g) of PGLA5050 was obtained at the irradiation time of 5 min. The color of the copolymers changed from white to light brown, and the yield was higher with the extension of the irradiation time. The molar component ratio of GA in PGLA (FG) was higher than the initial GA feed ratio (nGA) in the raw materials. As the nGA content increased, the glass transition temperature (Tg) of the copolymers decreased and the melting temperature (Tm) of the copolymers increased.

Karakteristik Poli Asam Laktat Glikolat (Kajian Rasio Asam Laktat Limbah Aren-Asam Glikolat)

METANA ◽  
2021 ◽  
Vol 17 (2) ◽  
pp. 88-96
Author(s):  
Sari Purnavita ◽  
Lucia Hermawati ◽  
Elisa Rinihapsari
Keyword(s):  
Ring Opening ◽  
Glycolic Acid ◽  
Ring Opening Polymerization ◽  
Solution Casting ◽  
Randomized Design ◽  
Solution Casting Method ◽  
Good Biocompatibility ◽  
Completely Randomized Design ◽  
Film Characteristics ◽  
Plga Film

Polimer Poli Asam Laktat Glikolat (PLGA) merupakan salah satu jenis polimer yang telah disetujui FDA dan EMA untuk penggunaan biomedik. Kelebihan PLGA yaitu biokompatibilitas, biodegradabilitas, fleksibilitas, dan efek samping yang minimal. PLGA telah dikembangkan untuk penggunaan medis namun pemenuhannya masih berupa impor. Oleh karena itu, pada penelitian ini monomer asam laktat dari limbah pati aren dan asam glikolat dengan rasio LA:GA = 75%:25%; 90%:10%; 95%:5%; direaksikan secara Ring Opening Polymerization (ROP) dengan bantuan katalis Sn(II) Oktoat membentuk PLGA. PLGA hasil kemudian ditambahkan PVA, dengan rasio PLGA:PVA 3:2; 3:3; 3:4; dan 3:5 dengan metode solution casting membentuk film. Penelitian dilakukan secara eksperimental dengan Rancangan Acak Lengkap (RAL) faktorial. Hasil penelitian menunjukkan adanya kombinasi rasio LA:GA dan rasio penambahan PVA mempengaruhi karakteristik film PLGA.  Hasil kekakuan dan Modulus Young film PLGA tertinggi pada kombinasi penambahan rasio LA:GA = 75%:25% dan penambahan rasio PLGA:PVA =3:4. Biodegrabilitas film PLGA terbaik pada kombinasi penambahan rasio LA:GA 90%:10% dan penambahan rasio PLGA:PVA 3:4. Film PLGA memiliki biokompatibilitas yang baik pada semua rasio LA:GA, dengan penambahan rasio PLGA:PVA lebih dari 3:2. Hasil film PLGA memiliki morfologi permukaan paling halus pada rasio penambahan PLGA : PVA 3:2, dan memiliki struktur semi kristalin.Lactic Glycolic Acid Polymer (PLGA) is a type of polymer that has been approved by the FDA and EMA for biomedical use. The advantages of PLGA are biocompatibility, biodegradability, flexibility, and minimal side effects. PLGA has been developed for medical use but fulfillment is still imported. Therefore, in this study, the lactic acid monomer from waste palm starch and glycolic acid with a ratio of LA: GA = 75%: 25%; 90%: 10%; 95%: 5%; reacted with Ring Opening Polymerization (ROP) with the help of a catalyst Sn (II) Octoate to form PLGA. The resulting PLGA was then added with PVA, with a ratio of PLGA: PVA 3: 2; 3: 3; 3: 4; and 3: 5 with the solution casting method forming the film. This research was conducted experimentally with a factorial completely randomized design (CRD). The results showed that the combination of LA: GA ratio and PVA addition ratio affected the PLGA film characteristics. The results of stiffness and Young's Modulus of PLGA film were highest in the combination of addition of the ratio of LA: GA = 75%: 25% and the addition of the ratio of PLGA: PVA = 3: 4. The best PLGA film biodegradability was combined with the addition of the ratio of LA: GA 90%: 10% and the addition of the PLGA: PVA ratio 3: 4. PLGA film has good biocompatibility in all LA: GA ratios, with the addition of a PLGA: PVA ratio of more than 3: 2. The results of the PLGA film had the smoothest surface morphology at the ratio of addition of PLGA: PVA 3: 2, and had a semi-crystalline structure.

New Aryloxy and Benzyloxy Derivatives of Titanium as Catalysts for Bulk Ring-Opening Polymerization of ϵ-Caprolactone and δ-Valerolactone

2009 ◽  
Vol 2009 (20) ◽  
pp. 2981-2993 ◽  
Author(s):  
Ravikumar R. Gowda ◽  
Debashis Chakraborty ◽  
Venkatachalam Ramkumar
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Derivatives Of

scholarly journals Preparation of poly(.ALPHA.-D,L-malic acid-co-glycolic acid) by ring-opening polymerization of a novel cyclic diester.

1989 ◽  
Vol 46 (4) ◽  
pp. 281-284 ◽  
Author(s):  
Yoshiharu KIMURA ◽  
Kenji SHIROTANI ◽  
Hideki YAMANE ◽  
Toshio KITAO
Keyword(s):  
Malic Acid ◽  
Ring Opening ◽  
Glycolic Acid ◽  
Ring Opening Polymerization
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