scholarly journals Synthesis and stereocomplex formation of enantiomeric alternating copolymers with two types of chiral centers, poly(lactic acid-alt-2-hydroxybutanoic acid)s

RSC Advances ◽  
2020 ◽  
Vol 10 (64) ◽  
pp. 39000-39007
Author(s):  
Hideto Tsuji ◽  
Kazuya Nakayama ◽  
Yuki Arakawa
Keyword(s):  
Lactic Acid ◽  
Physical Properties ◽  
Poly Lactic Acid ◽  
Biodegradable Materials ◽  
Alternating Copolymers ◽  
Stereocomplex Formation ◽  
Chiral Centers ◽  
Hydroxybutanoic Acid

Stereocomplex formation was reported for alternating copolymers of chiral α-substituted 2-hydroxyalkanoic acids which can be utilized for preparation of biodegradable materials with a variety of physical properties and biodegradability.

scholarly journals Configurational Molecular Glue: One Optically Active Polymer Attracts Two Oppositely Configured Optically Active Polymers

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Hideto Tsuji ◽  
Soma Noda ◽  
Takayuki Kimura ◽  
Tadashi Sobue ◽  
Yuki Arakawa
Keyword(s):  
Lactic Acid ◽  
Biodegradable Polymers ◽  
Optically Active ◽  
Poly Lactic Acid ◽  
Optically Active Polymers ◽  
Biodegradation Rate ◽  
Optically Active Polymer ◽  
Stereocomplex Formation ◽  
Hydroxybutanoic Acid ◽  
And Behavior

Abstract D-configured poly(D-lactic acid) (D-PLA) and poly(D-2-hydroxy-3-methylbutanoic acid) (D-P2H3MB) crystallized separately into their homo-crystallites when crystallized by precipitation or solvent evaporation, whereas incorporation of L-configured poly(L-2-hydroxybutanoic acid) (L-P2HB) in D-configured D-PLA and D-P2H3MB induced co-crystallization or ternary stereocomplex formation between D-configured D-PLA and D-P2H3MB and L-configured L-P2HB. However, incorporation of D-configured poly(D-2-hydroxybutanoic acid) (D-P2HB) in D-configured D-PLA and D-P2H3MB did not cause co-crystallization between D-configured D-PLA and D-P2H3MB and D-configured D-P2HB but separate crystallization of each polymer occurred. These findings strongly suggest that an optically active polymer (L-configured or D-configured polymer) like unsubstituted or substituted optically active poly(lactic acid)s can act as “a configurational or helical molecular glue” for two oppositely configured optically active polymers (two D-configured polymers or two L-configured polymers) to allow their co-crystallization. The increased degree of freedom in polymer combination is expected to assist to pave the way for designing polymeric composites having a wide variety of physical properties, biodegradation rate and behavior in the case of biodegradable polymers.

Preparation of Poly(Lactic Acid) Acrylate for UV-Curable Coating Applications

2015 ◽  
Vol 659 ◽  
pp. 570-574 ◽  
Author(s):  
Apinya Musidang ◽  
Nantana Jiratumnukul
Keyword(s):  
Lactic Acid ◽  
Physical Properties ◽  
High Efficiency ◽  
Low Energy ◽  
Poly Lactic Acid ◽  
Coating Film ◽  
Pencil Hardness ◽  
Uv Curable ◽  
Low Energy Consumption ◽  
Volatile Organic

UV-curable process is widely used for paints, inks and adhesives due to its rapid curing, low energy consumption, high efficiency and low volatile organic compounds (VOCs). The objective of this research is to prepare poly(lactic acid) (PLA) based UV-curable coating by using glycolyzed PLA. PLA was glycolyzed by ethylene glycol (EG) at 170°C for 90 minutes. The obtained glycolyzed PLA was reacted with methacrylic anhydride (MAAH) to provide PLA acrylate oligomer. The obtained PLA acrylate oligomer was used in coating formulations with various amounts of photoinitiator and cured under UV radiation. Physical properties of cured coating film were investigated such as pencil hardness, gloss and haze. The results showed that poly(lactic acid) (PLA) based UV-curable coating provided good physical properties.

Compatibility and physical properties of poly(lactic acid)/poly(ethylene terephthalate glycol) blends

2012 ◽  
Vol 20 (12) ◽  
pp. 1300-1306 ◽  
Author(s):  
Jun Yong Park ◽  
Sung Yeon Hwang ◽  
Won Jae Yoon ◽  
Eui Sang Yoo ◽  
Seung Soon Im
Keyword(s):  
Lactic Acid ◽  
Physical Properties ◽  
Ethylene Terephthalate ◽  
Poly Lactic Acid ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

scholarly journals Effect of freeze‐dried durian skin nanofiber on the physical properties of poly(lactic acid) biocomposites

2020 ◽  
Author(s):  
Nurfarahin Mohd Nordin ◽  
Hazleen Anuar ◽  
Yose Fachmi Buys ◽  
Fathilah Ali ◽  
Sabu Thomas ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Physical Properties ◽  
Poly Lactic Acid ◽  
Freeze Dried

The Influence Capitalize of Properties Improvement for Reinforced Plastics by Resin Flow Control Molding Method

2012 ◽  
Vol 6 (4) ◽  
pp. 522-528 ◽  
Author(s):  
Naoki Mori ◽  
◽  
Kiyohito Gondou ◽  
Kohei Shimada ◽  
Takahiro Kitamura ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Flow Control ◽  
Physical Properties ◽  
Glass Fiber ◽  
Poly Lactic Acid ◽  
Resin Flow ◽  
Fiber Reinforced ◽  
Molding Method ◽  
Reinforced Plastics ◽  
Glass Fiber Reinforced

We are now engaged in the study on a resin flow control molding method in which molecules and fillers are positively oriented by displacing resin flows in the mold. We intend to confirm that the resin flow control molding method can properly control the orientation of fibers in glass fiber reinforced polypropylene moldings. We have also attempted to improve physical properties of poly-lactic acid molded by the resin flow control molding method. We have directly observed the process of filling resins into a glass-inserted mold to prove effectiveness of the resin flow control molding method.

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