Perspectives, pillars, and examples of polymer reaction engineering in the 21st century

Tsavalas, John G.; Tripathi, Amit K.

doi:10.1016/bs.ache.2020.07.006

Cited by 3 publications

(2 citation statements)

References 64 publications

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“…More specifically, while initially the two vinyl of EGDMA have equivalent reactivity, when the first vinyl group is incorporated to the growing MAA chain the reactivity of the remaining vinyl group considerably decreases due to conformational and steric restrictions. [ 23 ] Hence, the reactivity of the hanging vinyl has to be triggered by an external source (plasma), another initiator (EGDMA, homopolymerization), or another pendant radical group; all of them resembling chain termination reactions. Note the evident role of increasing the plasma exposure in all the three scenarios.…”

Section: Resultsmentioning

confidence: 99%

Ultrathin Film Hydrogels with Controlled Swelling and Viscoelastic Properties Deposited by Nanosecond Pulsed Plasma Induced‐Polymerization

Sans,

Azevedo Gonçalves,

Quintana

2023

Adv Materials Inter

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Development of ultrathin film (utf) hydrogels for cutting‐edge biomedical applications (i.e. artificial skins) is receiving increasing attention. Nonetheless, achieving accurate control on the structure and thickness of utf‐hydrogels becomes extremely complex when assessed through conventional techniques. In this work, an atmospheric‐pressure plasma‐assisted deposition technique is reported, showing great thickness accuracy and versatility, to design utf‐hydrogels with customized properties. For the first time, specific and independent control on the generation and nature of cross‐links by only changing the plasma exposure frequency (fPE) during the synthesis process are reported. Thus, utf‐hydrogels are successfully prepared with tuned swelling ratios and viscoelastic properties (ranging from 150 to 20 kPa). Moreover, a thickness accuracy of 9 nm is reported, permitting the accurate synthesis of utf‐hydrogels below 150 nm. Exhaustive structural and topographical analyses allow elucidating the effects of the fPE on the cross‐link generation mechanism, discarding any undesired effect on the thickness accuracy. To support the structural results obtained, quartz‐crystal microbalance with dissipation (QCM‐D) coupled with spectroscopic ellipsometry are put in the spotlight as an efficient and viable alternative for the characterization of the resulting properties of ultrathin film soft materials, including the presence of a hydrated layer at the interface.

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Section: Resultsmentioning

confidence: 99%

Ultrathin Film Hydrogels with Controlled Swelling and Viscoelastic Properties Deposited by Nanosecond Pulsed Plasma Induced‐Polymerization

Sans,

Azevedo Gonçalves,

Quintana

2023

Adv Materials Inter

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“…The fundamental principles of chemical engineering underlie the operation of processes extending well beyond the boundaries of the chemical industry, and chemical engineers are employed in a range of operations outside traditional areas [23,24]. Plastics, polymers, and synthetic bers involve chemical-reaction engineering problems in their manufacture, with uid ow and heat transfer considerations dominating their fabrication [25,26]. The dyeing of a ber is a mass-transfer problem.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Heat transfer characteristics of heat-integrated continuous flow reactor systems for hydrogen production

Chen

2022

Preprint

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To understand and quantify the complex interactions in continuous flow reactor systems, detailed mathematical modeling of the underlying physical phenomena is an ideal tool to describe the multi-physics. Similarly, to control the overall operation of continuous flow reactor systems requires detailed mathematical models. This study relates to a thermochemical process for producing hydrogen by the catalytic endothermic reaction of methanol with steam in heat-integrated continuous flow reactor systems. Computational fluid dynamics simulations are conducted to better understand the consumption, generation, and exchange of thermal energy between endothermic and exothermic processes in the reactor. The objective of this study is to gain insight into the fundamental characteristics of heat transfer in heat-integrated continuous flow reactor systems. Particular emphasis is placed on the dependence of heat transfer characteristics on different design factors in various situations. The results indicate that the reactor design suffers from a fundamental limitation resulting from the flow configuration in which a reacting stream flows parallel to a heat transfer surface through which the majority of heat is transferred perpendicular to the direction of fluid flow. Balancing the heat requirements of an endothermic reaction with heat generated by an exothermic reaction flowing parallel to and on the opposite side of a separating plate is extraordinarily difficult since the endothermic reaction is likely to have a very different dependence upon concentration and temperature than the endothermic reaction. Thermally matching the reactions is still further complicated by the inherent temperature gradients that are present along the flow length of the reaction channel. Finally, the operating temperatures of the two reactions must be similar since the separate streams are separated only by the thin separating and heat transfer plate.

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Computer-aided design of initiator utilization strategies for vinyl chloride suspension polymerization with constant reaction rate

Han

Yang

Niu

et al. 2023

Chemical Engineering Science

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Perspectives, pillars, and examples of polymer reaction engineering in the 21st century

Cited by 3 publications

References 64 publications

Ultrathin Film Hydrogels with Controlled Swelling and Viscoelastic Properties Deposited by Nanosecond Pulsed Plasma Induced‐Polymerization

Ultrathin Film Hydrogels with Controlled Swelling and Viscoelastic Properties Deposited by Nanosecond Pulsed Plasma Induced‐Polymerization

WITHDRAWN: Heat transfer characteristics of heat-integrated continuous flow reactor systems for hydrogen production

Computer-aided design of initiator utilization strategies for vinyl chloride suspension polymerization with constant reaction rate

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