Photocrosslinked β-cyclodextrin polymer beads and their use as sorbent for phenol removal from wastewater

Yamasaki, Hirohito; Odamura, Aya; Makihata, Yousuke; Fukunaga, Kimitoshi

doi:10.1007/s00289-022-04206-1

Cited by 6 publications

(1 citation statement)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Generally, researchers employ diisocyanates such as diphenylmethane diisocyanate (MDI) [ 27 ] or hexamethylene diisocyanate (HDMI) [ 24 , 25 , 26 , 28 , 29 ] as the urethane sequences in order to prepare PEG-diisocyanate prepolymers, which are also used in crosslinking with cyclodextrins. Herein, the isocyanate (NCO) component of the polyaddition system, isophorone diisocyante (IPDI), was used for various organic coatings [ 30 ] and also in the preparation of cyclodextrin materials due to its low crosslinking propensity [ 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. One of the main reasons behind the frequent use of IPDI is related to the possibility of controlling the reaction process due to the particular chemical structure that endows the NCO groups with different reactivity at relatively low temperatures [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Hydroxyl Type on Crosslinking Process in Cyclodextrin Based Polyurethane Networks

Peptu¹,

Diaconu²,

Danu

et al. 2022

Gels

View full text Add to dashboard Cite

The influence of the hydroxyl groups (OH) type on the polyaddition processes of isocyanates represents a critical approach for the design of multicomponent polyurethane systems. Herein, to prove the effect of hydroxyl nature on both the isocyanate-OH polyaddition reactions and the structure/properties of the resulting networks, two structurally different cyclodextrins in terms of the primary and secondary groups’ ratio were analyzed, namely native β-cyclodextrin (CD) and its derivative esterified to the primary hydroxyl groups with oligolactide chains (CDLA). Thus, polyurethane hydrogels were prepared via the polyaddition of CD or CDLA to isophorone diisocyanate polyethylene glycol-based prepolymers (PEG-(NCO)2). The degradable character of the materials was induced by intercalating oligolactide short sequences into the polymer chains composing the polymer network. In order to establish the influence of the OH type, the synthesis of polyurethane hydrogels was analyzed by a rheological investigation of the overall system reactivity. Materials properties such as swelling behavior, thermal properties and hydrolytic degradation were influenced by the reaction feed. Specifically, the presence of primary OH groups leads to more compact networks with similar water uptake, disregarding the CD content, while the predominance of secondary OH groups together with the presence of oligolactide spacers leads to the fine tuning of the water swelling properties.

show abstract