Thermoplastic elastomers based on poly(<scp>l</scp>‐Lysine)‐Poly(ε‐Caprolactone) multi‐block copolymers

Ling, Jun; Wang, Xiaoqing; You, Lixin; Shen, Zhiquan

doi:10.1002/pola.28187

Cited by 11 publications

(9 citation statements)

References 34 publications

(45 reference statements)

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“…PTMG is generally prepared by the ring‐opening polymerization of tetrahydrofuran (THF) over acid catalysts in the presence of suitable reagents that are able to control the molecular weight to the desired value . Several methods for the synthesis of PTMG have been reported since the first report on PTMG by Meerwein et al . For example, strong acids such as fluorosulfuric acid and perchloric acid have been used for the production of PTMG .…”

Section: Introductionmentioning

confidence: 99%

Highly efficient ring‐opening polymerization of tetrahydrofuran by anhydrous ferric chloride

Yang

Yoon

Park

et al. 2019

J of Applied Polymer Sci

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Poly(tetramethylene ether glycol) (PTMG), widely used as a precursor in the fabrication of commodity polymers, is typically produced byacid‐catalyzed polymerization of tetrahydrofuran (THF). Herein, we report a detailed investigation of the cationic ring‐opening polymerization of THF catalyzed by ferric chloride (FeCl3), which can be considered as a strong Lewisacid. The polymerization reactions were performed in the presence of acetic anhydride at 20°C with FeCl3, which readily produced poly(tetramethylene ether glycol diester) (PTMG_DE). A maximum yield of 79.2% was obtained within 30 min using a FeCl3 to acetic anhydride molar ratio of 5:4. The resulting polymers generally exhibited low molecular weights and a narrow polydispersity index and could be easily converted into PTMG using aqueous NaOH. In contrast with the FeCl3‐acetic anhydride system, other iron‐based catalysts such as FeCl2 and FeCl3·6H2O did not show any noticeable activity in the polymerization of THF. The proposed mechanism involves initiation of the acetyl cation generated by FeCl3, propagation by nucleophilic addition of THF, and termination by the acetate anion, accounting for the high activity of the FeCl3 catalyst for THF polymerization. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47999.

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Section: Introductionmentioning

confidence: 99%

Highly efficient ring‐opening polymerization of tetrahydrofuran by anhydrous ferric chloride

Yang

Yoon

Park

et al. 2019

J of Applied Polymer Sci

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“…A novel bio-based polypeptide-polyester TPE is obtained by copolymerization of poly(l-lysine), poly(Ne-carbobenzyloxyl-l-lysine), poly(e-caprolactone), and PEG. 294 It has excellent mechanical properties with a modulus of 5-60 MPa, a tensile strength of 6-23 MPa, and an elongation at break up to 1300%. It can be used to produce nonwoven felts by electrospinning with a strong hydrophilic surface and good wettability.…”

Section: Other Thermoplastic Elastomersmentioning

confidence: 99%

Current trends in bio‐based elastomer materials

Tang

Wang

et al. 2022

SusMat

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Elastomers play an irreplaceable role in our society due to their unique properties. Natural rubber is directly obtained from plants and is widely used in tires, shoes, etc. Recently, modified natural rubbers are proposed to expand the application of natural rubber. However, these natural rubbers have a limited variety of molecular structures and may not be able to meet ever-demanding applications. Traditional synthetic elastomers have a variety of molecular structures and their properties are used in various fields, but mainly originate from fossil resources. This review deals with bio-based elastomers, and more specifically natural rubber and bio-based synthetic elastomers. Based on reprocessability, bio-based elastomers can also be divided into bio-based chemically cross-linked ones and thermoplastic ones. Compared to traditional fossil-based elastomers, bio-based ones may alleviate environmental pollution and promote the sustainable development of the elastomer industry. K E Y W O R D Sbio-based elastomers, chemically cross-linked, natural rubber, synthetic rubber INTRODUCTIONElastomers are polymeric materials possessing low modulus and high elasticity, and can rapidly recover their orig-This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…Multiblock copolymers (MBCPs) exhibit versatile properties and applicable performances desired in various fields. [ 1‐3 ] Strategies are applied to synthesize well‐defined MBCPs, including sequential living polymerization, [ 3‐4 ] cross‐linking reagents [ 5 ] chain modification reactions, [ 6 ] etc . These strategies suffer from the restriction of monomer reactivities, tedious multi‐step reactions and modification efficiencies.…”

Section: Background and Originality Contentmentioning

confidence: 99%

Janus Polymerization: A One‐Shot Approach towards Amphiphilic Multiblock Poly(ester‐acetal)s Directly from 1,3‐Dioxolane with ε‐Caprolactone

et al. 2022

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Janus polymerization consists of anionic and cationic ring opening polymerizations (AROP and CROP) at the two ends of a single propagating polymer chain, followed by a self-triggered chain extension generating multiblock copolymers (MBCPs) in one step. In the contribution, Janus polymerization by Tm(OTf) 3 or Er(OTf) 3 catalyst with an epoxy initiator is applied to synthesize MBCPs of semi-crystalline poly(ε-caprolactone) (PCL) blocks from coordinated AROP and poly(1,3-dioxolane-co-ε-caprolactone) (P(DO-co-CL)) blocks from CROP of DO with CL. Meanwhile, amorphous random copolymers [P(DO-r-CL)] are synthesized as control by employing other rare earth triflates [RE(OTf) 3 , RE = Y, Nd, Gd and Lu] as catalysts or in the absence of an initiator via CROP. On account of the distinguishable chemical structures and thermal properties between Janus MBCPs and cationic random copolymers, Janus features are confirmed including the CROP and AROP at a single propagating chain. The resultant amphiphilic copolymers self-assemble to nanoparticles in aqueous solution with designable diameters with the corresponding ratios of hydrophilic and hydrophobic segments. MBCPs exhibit good shape memory properties with appropriate deformation temperature close to human body's, providing a prospect on the applications in biomedical devices.

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Thermoplastic elastomers based on poly(l‐Lysine)‐Poly(ε‐Caprolactone) multi‐block copolymers

Cited by 11 publications

References 34 publications

Highly efficient ring‐opening polymerization of tetrahydrofuran by anhydrous ferric chloride

Highly efficient ring‐opening polymerization of tetrahydrofuran by anhydrous ferric chloride

Current trends in bio‐based elastomer materials

Janus Polymerization: A One‐Shot Approach towards Amphiphilic Multiblock Poly(ester‐acetal)s Directly from 1,3‐Dioxolane with ε‐Caprolactone

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