scholarly journals Stereoselective Ring-Opening Polymerization of Functional β-Lactones: Influence of the Exocyclic Side-Group

2021 ◽  
Author(s):  
Rama Shakaroun ◽  
Hui Li ◽  
Philippe Jéhan ◽  
Marielle Blot ◽  
Ali Alaaeddine ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Chemical Diversity ◽  
Side Chain ◽  
Side Group

Polyhydroxyalkanoates (PHAs) are a unique class of polyesters especially due to their chemical diversity imparted by their side-chain substituent that provides a handle to tune their properties, such as their...

Mesophase and Optical Properties of Side Chain Copolyacrylate with Mesogens and OLLA Segments Side Chains

2011 ◽  
Vol 181-182 ◽  
pp. 397-400
Author(s):  
Ya Ping Liu ◽  
Zhuo Hua Li ◽  
Ling Min Sun ◽  
Run Tao Dong ◽  
Hong Ru Chen ◽  
...  
Keyword(s):  
Ring Opening ◽  
Optical Rotation ◽  
Helical Structure ◽  
Ring Opening Polymerization ◽  
Side Chain ◽  
Side Chains ◽  
Induce Effect ◽  
Phase Structures ◽  
Acrylate Esters ◽  
Phase Behaviors

Thermal properties and phase behaviors of series of newly synthesized copolyacrylate esters with oligomeric-L-LA (OLLA) segments (DP = 10-40) and mesogens as side chains were characterized. The OLLAs prepared by ring opening polymerization of L-LA with active HO-group were modified to form polymerizable acrylate esters and then copolymerized with polymerizable mesogens. The thermal behaviors of these copolyacrylate esters were studied by DSC and POM measurements and phase structures by XRD measurements. The mesogens showed very good induce effect on the formation of layered structures. CD measurements were used to determine the helical structure and the optical rotation power of the side chain copolyacrylate esters.

Synthesis of Ferroelectric Liquid Crystalline Polymers by Ring Opening Polymerization

1996 ◽  
Vol 425 ◽  
Author(s):  
C. S. Hsu ◽  
C. J. Lee
Keyword(s):  
Ring Opening ◽  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Ring Opening Polymerization ◽  
Side Chain ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Crystalline Polymers ◽  
Smectic A ◽  
Smectic C

AbstractThe synthesis of two series of side-chain liquid crystalline polyoxetanes and polyoxiranes containing 4-alkanyloxybiphenyl-4′ -yl (2S,3S)-2-chloro-3-methylvalerate side groups is presented. Differential scanning calorimetry, polarizing optical microscopy, and X-ray diffractometry reveal smectic mesomorphism for all obtained polymers. Most of the prepared polyoxetanes present smectic A and chiral smectic C phases. The polyoxetane containing tweleve methylene units in the spacer is the only one showing two enantiotropic smectic A and B phases. All of the obtained polyoxiranes display two enantiotropic smectic A and B phases. Although the polyoxetane and polyoxirane backbones are more flexible than the polymethacrylate backbone, side-chain crystallization do not occur in any of the synthesized polymers.

Invoking Side-Chain Functionality for the Mediation of Regioselectivity during Ring-Opening Polymerization of Glucose Carbonates

2020 ◽  
Vol 142 (40) ◽  
pp. 16974-16981
Author(s):  
Yue Song ◽  
Xin Yang ◽  
Yidan Shen ◽  
Mei Dong ◽  
Yen-Nan Lin ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Side Chain

Precise synthesis of linear polysiloxanes with a polar side-chain structure by organocatalytic controlled/living ring-opening polymerization of (3-cyanopropyl)pentamethylcyclotrisiloxane

2021 ◽  
Author(s):  
Keita Fuchise ◽  
Kazuhiko Sato ◽  
Masayasu Igarashi
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Chain Structure ◽  
Side Chain ◽  
Capping Agents ◽  
End Capping

The organocatalytic controlled/living ring-opening polymerization (ROP) of (3-cyanopropyl)pentamethylcyclotrisiloxane (CNPD2) using water or a silanol as the initiator, 1,3-trimethylene-2-methylguanidine (TMMG) as the catalyst, and organochlorosilanes as the end-capping agents produced linear...

Efficient synthesis and excellent antimicrobial activity of star-shaped cationic polypeptides with improved biocompatibility

2021 ◽  
Vol 9 (7) ◽  
pp. 2721-2731
Author(s):  
Hao Liu ◽  
Xu Zhang ◽  
Ziyin Zhao ◽  
Fangping Yang ◽  
Ruizhong Xue ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Side Chain ◽  
Efficient Synthesis

Star poly(L-lysine) homo- and copolymers with excellent antimicrobial activity and improved biocompatibility can be readily prepared by the combination of ultra-fast ring opening polymerization and efficient side-chain modification.

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