Iterative Convergent Synthesis of Large Cyclic Polymers and Block Copolymers with Discrete Molecular Weights

2020 ◽  
Vol 142 (33) ◽  
pp. 14028-14032
Author(s):  
Mo Beom Koo ◽  
Seul Woo Lee ◽  
Jung Min Lee ◽  
Kyoung Taek Kim
Keyword(s):  
Block Copolymers ◽  
Cyclic Polymers ◽  
Convergent Synthesis ◽  
Molecular Weights

Preparation of amphiphilic block copolymers (polyethylene adipate-block-polyethylene glycol) and its application in rotogravure ink formulations

2018 ◽  
Vol 47 (5) ◽  
pp. 415-423 ◽  
Author(s):  
Yasser Assem ◽  
Heba A. Mohamed ◽  
Rana Said ◽  
Ahmed El-Masry
Keyword(s):  
Optical Properties ◽  
Polyethylene Glycol ◽  
Block Copolymers ◽  
Ethylene Glycol ◽  
Adipic Acid ◽  
Amphiphilic Block Copolymers ◽  
Synthesis Process ◽  
Gravimetric Analysis ◽  
Content Type ◽  
Molecular Weights

Purpose The purpose of this paper is to prepare amphiphilic block copolymers polyethylene adipate-block-polyethylene glycol (PEA-b-PEG)s and study their performance as plasticizers in rotogravure ink formulations. Design/methodology/approach Series of amphiphilic block copolymers (PEA-b-PEG1), (PEA-b-PEG2), (PEA-b-PEG3), (PEA-b-PEG4) and (PEA-b-PEG5) were prepared by the reaction of adipic acid, ethylene glycol and polyethylene glycol of different molecular weights (300, 1,000, 2,000, 10,000 and 20,000 g/mol), respectively. Full characterization of the prepared copolymers was achieved using Fourier Transfer Infrared Spectroscopy (FTIR), 1H NMR, thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). The performance of the prepared copolymers as plasticizers for neat nitrocellulose resin were studied in different formulations, namely, R1, R2, R3, R4 and R5 containing copolymers (PEA-b-PEG1), (PEA-b-PEG2), (PEA-b-PEG3), (PEA-b-PEG4) and (PEA-b-PEG5), respectively. In addition to formula R0 that contains acetyl tributyl citrate (ATBC) as a commercial plasticizer. The mechanical properties, thermal analysis (DSC, TGA) and optical properties of the prepared formulations films were investigated. Theses amphiphilic block copolymers were then applied as plasticizers in different rotogravure ink formulations (F1, F2, F3, F4 and F5) and compared with commercial rotogravure ink formula (F0). The color measurements and optical properties of all formulations were achieved. Findings It was found that the performance of the prepared copolymers as plasticizers in different formulations based on nitro cellulose resin gives better gloss, adhesion for R1 compared with the other samples and color strength for F1 compared with F0. Finally, all the samples gave excellent plasticizing effect. Research limitations/implications The authors believe that type of these materials open the way for a new class of plasticizers that upon application or even degradation gives small ecofriendly molecules (adipic acid and or ethylene glycol moieties) taking into consideration the simplicity of the rout of the synthesis process. Practical implications The prepared ecofriendly (PEA-b-PEG)s could be successfully used as plasticizers instead of commercial plasticizer ATBC. Originality/value The research provides that the prepared (PEA-b-PEG)s with different molecular weights can act as plasticizers in rotogravure ink formulations, and their performance was acceptable and available.

scholarly journals Phosphonium-containing diblock copolymers from living anionic polymerization of 4-diphenylphosphino styrene

2016 ◽  
Vol 52 (5) ◽  
pp. 950-953 ◽  
Author(s):  
Alison R. Schultz ◽  
Gregory B. Fahs ◽  
Chainika Jangu ◽  
Mingtao Chen ◽  
Robert B. Moore ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Anionic Polymerization ◽  
Diblock Copolymers ◽  
Living Anionic Polymerization ◽  
Molecular Weights

Living anionic polymerization of 4-diphenylphosphino styrene (DPPS) achieved well-defined homopolymers, poly(DPPS-b-S) styrenic block copolymers, and poly(I-b-DPPS) diene-based diblock copolymers with predictable molecular weights and narrow polydispersities.

TPE-containing amphiphilic block copolymers: synthesis and application in the detection of nitroaromatic pollutants

2020 ◽  
Vol 11 (45) ◽  
pp. 7244-7252
Author(s):  
Shiyuan Zhou ◽  
Peiyang Gu ◽  
Haibo Wan ◽  
Yutao Zhu ◽  
Anna Wang ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Fluorescence Detection ◽  
Raft Polymerization ◽  
Nitroaromatic Compounds ◽  
Amphiphilic Block Copolymers ◽  
Molecular Weights

Two AIE block copolymers termed P1 and P2 bearing TPE and PEG-based chains were synthesized with moderate molecular weights and narrow PDIs via RAFT polymerization. Both P1 and P2 can be used in the fluorescence detection of nitroaromatic compounds (NACs) and cell images.

Temperature programed photo-induced RAFT polymerization of stereo-block copolymers of poly(vinyl acetate)

2017 ◽  
Vol 8 (39) ◽  
pp. 6024-6027 ◽  
Author(s):  
Na Li ◽  
Dongdong Ding ◽  
Xiangqiang Pan ◽  
Zhengbiao Zhang ◽  
Jian Zhu ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Vinyl Acetate ◽  
Triblock Copolymers ◽  
Raft Polymerization ◽  
Molecular Weights

Stereo-triblock copolymers of poly(vinyl acetate) are synthesized with controlled molecular weights based on a temperature-programed photo-induced RAFT in HFIP.

Anionic Synthesis of Graft Block Copolymers with Poly(2-vinylpyridine) Trunks: Effects of Trunk and Branch Molecular Weights

1994 ◽  
Vol 27 (8) ◽  
pp. 2336-2338 ◽  
Author(s):  
Hiroshi Watanabe ◽  
Takayuki Amemiya ◽  
Takatoshi Shimura ◽  
Tadao Kotaka
Keyword(s):  
Block Copolymers ◽  
Molecular Weights ◽  
Anionic Synthesis

scholarly journals Field-Theoretic Simulation of Block Copolymers at Experimentally Relevant Molecular Weights

2015 ◽  
Vol 48 (24) ◽  
pp. 9071-9080 ◽  
Author(s):  
Bart Vorselaars ◽  
Pawel Stasiak ◽  
Mark W. Matsen
Keyword(s):  
Block Copolymers ◽  
Molecular Weights

scholarly journals Impact of Core-Forming Segment Structure on Drug Loading in Biodegradable Polymeric Micelles Using PEG-b-Poly(lactide-co-depsipeptide) Block Copolymers

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Akihiro Takahashi ◽  
Yuta Ozaki ◽  
Akinori Kuzuya ◽  
Yuichi Ohya
Keyword(s):  
Block Copolymers ◽  
Polymeric Micelles ◽  
Drug Loading ◽  
Polymeric Micelle ◽  
Molecular Weights ◽  
The Core ◽  
Drug Delivery Carrier ◽  
Loading Efficiency ◽  
Drug Loading Efficiency ◽  
Model Drug

We synthesized series of amphiphilic AB-type block copolymers having systematic variation in the core-forming segments using poly(lactide-co-depsipeptide)s as a hydrophobic segment and prepared polymeric micelles using the block copolymers, PEG-b-poly(lactide-co-depsipeptide). We then discussed the relationship between the core-forming segment structure and drug loading efficiency for the polymeric micelles. PEG-b-poly(lactide-co-depsipeptide)s, PEG-b-PLGL containingl-leucine (Leu), and PEG-b-PLGF containingl-phenylalanine (Phe), with similar molecular weights and various mole fractions of depsipeptide units, were synthesized. Polymeric micelles entrapping model drug (fluorescein, FL) were prepared using these copolymers. As a result, PEG-b-poly(lactide-co-depsipeptide) micelles showed higher drug loading compared with PEG-b-PLLA and PEG-b-PDLLA as controls. The drug loading increased with increase in the mole fraction of depsipeptide unit in the hydrophobic segments. The introduction of aliphatic and aromatic depsipeptide units was effective to achieve higher FL loading into the micelles. PEG-b-PLGL micelle showed higher drug loading than PEG-b-PLGF micelle when the amount of FL in feed was high. These results obtained in this study should be useful for strategic design of polymeric micelle-type drug delivery carrier with high drug loading efficiency.

Modification of Montmorillonite with PEO-b-PS Copolymers

2000 ◽  
Vol 628 ◽  
Author(s):  
Frederick L. Beyer ◽  
Nora C. Beck Tan
Keyword(s):  
Block Copolymers ◽  
Ethylene Oxide ◽  
Block Length ◽  
X Ray Diffraction ◽  
X Ray ◽  
Volume Fractions ◽  
Melt Intercalation ◽  
Molecular Weights ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

ABSTRACTWyoming montmorillonite has been modified with block copolymers of poly (styrene) (PS) and poly(ethylene oxide) (PEO). Using melt intercalation techniques, PEO-b-PS copolymers spanning a range of volume fractions and molecular weights were mixed with montmorillonite, annealed above the Tg of PS, and characterized using X-ray diffraction. Most of the block copolymers intercalated the clay, with several samples exhibiting multiple Bragg reflections from increased gallery spacing. Samples with higher PEO volume fractions were most likely to have intercalation. For a given PS block length, longer PEO blocks were more likely to produce intercalation. In general, the increased gallery spacings were close to those produced by modifying montmorillonite with PEO homopolymer.

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