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Search · four archives
21 papers · ranked by Valyu relevance
Authors not listed
The preparation of conjugated polymers with precisely tuneable opto-electronic properties is based on modern polymerization techniques. In addition to conventional step growth polycondensation for the underlying C−C coupling steps, the Suzuki-Catalyst-Transfer- Polymerization (SCTP) continues to attract great interest…
Noriyuki Kato, Shinya Ikeda, Manabu Hirakawa, Hiroshi Ito
The influences of the average degree of polymerization (Dp), which is derived from Mn and terminal end group, on optical and thermal properties of various refractive indexed transparent polymers were investigated. In this study, we selected the alicyclic compound, Dinorbornane dimethanol (DNDM) homo polymer, because it…
Miriam P. Barrera-Nava, Rodrigo Navarro, Ángel Marcos-Fernández, José E. Báez
'José E. Báez'] Nine different macrodiols derived from α,ω-hydroxy telechelic poly(ε-caprolactone) (HOPCLOH) were prepared by ring-opening polymerization of ε-caprolactone (CL) using three linear aliphatic diols (HO-(CH2)n-OH, where n = 4, 8, and 12) as initiators and catalyzed by ammonium decamolybdate…
Authors not listed
Polycatenanes, a novel class of polymers consisting of interlocked macrocyclic monomers, have attracted significant attention. However, the formation mechanism of polycatenanes through direct catenation remains poorly understood. Herein we explore the structural diversity and unique chain termination mechanism inherent…
Hui Deng, Yan Han
The number-average functionality is proposed a simplified equation which can be used to predict the reaction progress of the stepwise polymerization expediently. According to the equation, once the average functionality of one reactant ((f_b ) ̅, for example) is fixed, there will be a critical functionality of (f_a )…
Hideto Tsuji, Takehiko Eto, Yuzuru Sakamoto
Non-substituted racemic poly(DL-lactic acid) (PLA) and substituted racemic poly(DL-lactic acid)s or poly(DL-2-hydroxyalkanoic acid)s with different side-chain lengths, i.e., poly(DL-2-hydroxybutanoic acid) (PBA), poly(DL-2-hydroxyhexanoic acid) (PHA), and poly(DL-2-hydroxydecanoic acid) (PDA) were synthesized by…
Serhii Kondratov
Oligomers Authors: ['Serhii Kondratov'] An approach to modeling the oligomer composition distribution function in the irreversible step growth homopolymerization process based on a mixture of oligomers ofarbitrary composition is developed. The approach is based on consideration of probabilities of processes in the…
Gabriel P. Costa, Phillip Choi, Stanislav R. Stoyanov, Qi Liu
Context To determine the miscibility of liquids at high temperatures using the concept of Hildebrand solubility parameter $\delta$, the current practice is to examine the difference in $\delta$ between two liquids at room temperature, assuming that $\delta$ is not sensitive to temperature. However, such an assumption…
Michael Lang, Frank Böhme
A co-polycondensation reaction is discussed analytically and by Monte-Carlo simulations where two reactive units compete for reactions with an alternating third reactive unit, whereby irreversible reactions replace bonds which are able to undergo exchange reactions. The resulting number average molar mass, Mn, exhibits…
E Zumbro, J Witten, A Alexander-Katz
Multivalent binding interactions are commonly found throughout biology to enhance weak monovalent binding such as between glycoligands and protein receptors. Designing multivalent polymers to bind to viruses and toxic proteins is a promising avenue for inhibiting their attachment and subsequent infection of cells.…
Hui Deng, Yan Han
The number-average functionality is proposed a simplified equation which can be used to predict the reaction progress of the stepwise polymerization expediently. According to the equation, once the average functionality of one reactant ((f_b ) ̅, for example) is fixed, there will be a critical functionality of (f_a )…
Jiyue Luo, Yue Wang, Tamaki Nakano
Copolymerizations of dibenzofulvene (DBF) with methyl methacrylate (MMA), 2-hydroxyethyl methacrylate (HEMA), methyl acrylate (MA), and 2-hydroxyethyl acrylate (HEA) were conducted under free radical conditions in toluene using α,α′-azobisisobutylonitrile (AIBN) as the initiator. In the copolymerizations, DBF indicated…
Bastien Luzel, Noémie Gil, Patrick Désirée, Julien Monot + 6 more
The environmental impact of plastic waste has been a real problem for the past decades. The incorporation of cleavable bonds in the polymer backbone is a solution to make a commodity polymer degradable. When radical polymerization is used, this approach is made possible by the radical ring-opening polymerization (rROP)…
Martyna Sokołowska, Jagoda Nowak-Grzebyta, Ewa Stachowska, Piotr Miądlicki + 2 more
An environmentally friendly method of creating sustainable alternatives to traditional aromatic-aliphatic polyesters is discussed as a valuable step towards resource-efficiency optimization. A group of furan-based copolymers was synthesised via temperature-varied twostep polycondensation reaction in diphenyl ether…
Swarnali Neogi, Qamar un Nisa, Rohani Abu Bakar, Nathaniel Bingham + 1 more
With rising concern over plastic waste accumulation worldwide, the quantitative depolymerization of polymers into small molecule building blocks offers avenues toward a circular polymer economy. But a tuning of the polymer stability versus degradation efficiency remains challenging. Herein, the thionolactone…
Léa Bonnot, Christophe Len, Étienne Grau, Henri Cramail
In the context of the development of bio-refineries, glycerol and its derivatives are coproducts of the oleochemistry for which new valorization routes must be found. In this study, the polymerizability of divinylglycol (DVG), a symmetrical C-6 glycerol derivative which bears a vicinal diol and two vinyl functions was…
Zhuoting Chen, Behrad Koohbor, Xiang Zhang, Leon M. Dean + 2 more
Development in Rapid Frontally Curing Polymers Authors: ['Zhuoting Chen' 'Behrad Koohbor' 'Xiang Zhang' 'Leon M. Dean' 'Philippe H. Geubelle' 'Nancy R. Sottos'] Frontal polymerization (FP) has emerged as a rapid and energy-efficient process for fabricating thermoset polymers and composites. In this process, a…
Martin Girard
Polymer physics has arisen as a pillar of understanding behavior of intrinsically disordered proteins. Behavior of polymers can be understood in terms of generic behavior. Specifically, phase behavior can be understood in terms of solvent quality and chain length. The theory is well established for homopolymers, and…
Hendrik Puetz, Alexander-Maurice Illig, Mariia Vorobii, Christoph Janknecht + 3 more
Management of synthetic polymer waste is one of the most pressing challenges for society today. Enzymatic recycling of polycondensates like polyamides (PA), however, remains limited due to a lack of efficient polyamidases. This study reports the directed evolution of the polyamidase NylCp2-TS. Key positions involved in…
Ezequiel R. Soulé, Julio Borrajo, Roberto J. J. Williams
The kinetics of the free-radical polymerization of isobornyl methacrylate (IBoMA) at 80 ºC, initiated by benzoyl peroxide (BPO), was determined by differential scanning calorimetry (DSC), using sample pans previously sealed in air or in nitrogen. The polymerization was arrested by vitrification at a final conversion…
Tomohiro Furuki, Azusa Togo, Hatsuho Usuda, Tomohiro Nobeyama + 2 more
Polyphosphate (polyP) is one of the most conserved biomacromolecules and can form aggregates, such as polyP granules in bacteria, which are generated through liquid–liquid phase separation (LLPS). Studies have examined the mechanism of polyP aggregation using LLPS systems containing artificial polyP molecules as…