scholarly journals Effect of Ionizing Radiation on the Chemical Structure and the Physical Properties of Polycaprolactones of Different Molecular Weight

Polymers ◽  
2018 ◽  
Vol 10 (4) ◽  
pp. 397 ◽  
Author(s):  
Rodrigo Navarro ◽  
Guillermina Burillo ◽  
Esbaide Adem ◽  
Angel Marcos-Fernández
Keyword(s):  
Molecular Weight ◽  
Ionizing Radiation ◽  
Physical Properties ◽  
Chemical Structure ◽  
Different Molecular Weight

scholarly journals Nano-Assemblies from Amphiphilic PnBA-b-POEGA Copolymers as Drug Nanocarriers

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1164
Author(s):  
Angeliki Chroni ◽  
Thomas Mavromoustakos ◽  
Stergios Pispas
Keyword(s):  
Molecular Weight ◽  
Chain Transfer ◽  
Raft Polymerization ◽  
Polymeric Nanocarriers ◽  
Reversible Addition ◽  
2D Noesy ◽  
Drug Nanocarriers ◽  
Glycol Methyl Ether ◽  
Different Molecular Weight

The focus of this study is the development of highly stable losartan potassium (LSR) polymeric nanocarriers. Two novel amphiphilic poly(n-butyl acrylate)-block-poly(oligo(ethylene glycol) methyl ether acrylate) (PnBA-b-POEGA) copolymers with different molecular weight (Mw) of PnBA are synthesized via reversible addition fragmentation chain transfer (RAFT) polymerization, followed by the encapsulation of LSR into both PnBA-b-POEGA micelles. Based on dynamic light scattering (DLS), the PnBA30-b-POEGA70 and PnBA27-b-POEGA73 (where the subscripts denote wt.% composition of the components) copolymers formed micelles of 10 nm and 24 nm in water. The LSR-loaded PnBA-b-POEGA nanocarriers presented increased size and greater mass nanostructures compared to empty micelles, implying the successful loading of LSR into the inner hydrophobic domains. A thorough NMR (nuclear magnetic resonance) characterization of the LSR-loaded PnBA-b-POEGA nanocarriers was conducted. Strong intermolecular interactions between the biphenyl ring and the butyl chain of LSR with the methylene signals of PnBA were evidenced by 2D-NOESY experiments. The highest hydrophobicity of the PnBA27-b-POEGA73 micelles contributed to an efficient encapsulation of LSR into the micelles exhibiting a greater value of %EE compared to PnBA30-b-POEGA70 + 50% LSR nanocarriers. Ultrasound release profiles of LSR signified that a great amount of the encapsulated LSR is strongly attached to both PnBA30-b-POEGA70 and PnBA27-b-POEGA73 micelles.

Study of Solid Polyurethane Electrolytes Synthesized from HDI and PEO of Different Molecular Weight

2021 ◽  
pp. 115305
Author(s):  
Qian Zhang ◽  
Yuhao Wen ◽  
Kang Liu ◽  
Nailiang Liu ◽  
Yaping Du ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Different Molecular Weight

Effect of PDADMAC with different molecular weight regulating Hβ Properties on hydrogenation performance of NiMoC/Hβ catalysts

2021 ◽  
Vol 213 ◽  
pp. 106704
Author(s):  
Chenguang Jiang ◽  
Yonggang Wang ◽  
Haiyong Zhang ◽  
Xiongchao Lin ◽  
KeChang Xie
Keyword(s):  
Molecular Weight ◽  
Different Molecular Weight
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