RAFT polymerisation and hypercrosslinking improve crosslink homogeneity and surface area of styrene based polyHIPEs

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F23%3A00571800" target="_blank" >RIV/61389013:_____/23:00571800 - isvavai.cz</a>

Result on the web

<a href="https://www.mdpi.com/2073-4360/15/10/2255" target="_blank" >https://www.mdpi.com/2073-4360/15/10/2255</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/polym15102255" target="_blank" >10.3390/polym15102255</a>

Result language

angličtina

Original language name

RAFT polymerisation and hypercrosslinking improve crosslink homogeneity and surface area of styrene based polyHIPEs

Original language description

The influence of a polymerisation mechanism (reversible addition–fragmentation chain transfer, RAFT vs. free radical polymerisation, FRP) on the porous structure of highly porous poly(styrene-co-divinylbenzene) polymers was investigated. The highly porous polymers were synthesised via high internal phase emulsion templating (polymerizing the continuous phase of a high internal phase emulsion), utilising either FRP or RAFT processes. Furthermore, residual vinyl groups in the polymer chains were used for the subsequent crosslinking (hypercrosslinking) applying di-tert-butyl peroxide as the source of radicals. A significant difference in the specific surface area of polymers prepared by FRP (between 20 and 35 m2/g) and samples prepared by RAFT polymerisation (between 60 and 150 m2/g) was found. Based on the results from gas adsorption and solid state NMR, it could be concluded that the RAFT polymerisation affects the homogeneous distribution of the crosslinks in the highly crosslinked styrene-co-divinylbenzene polymer network. During the initial crosslinking, RAFT polymerisation leads to the increase in mesopores with diameters between 2 and 20 nm, resulting in good accessibility of polymer chains during the hypercrosslinking reaction, which is reflected in increased microporosity. The fraction of micropores created during the hypercrosslinking of polymers prepared via RAFT is around 10% of the total pore volume, which is up to 10 times more than for polymers prepared by FRP. Specific surface area, mesopore surface area, and total pore volume after hypercrosslinking reach almost the same values, regardless of the initial crosslinking. The degree of hypercrosslinking was confirmed by determination of the remaining double bonds by solid-state NMR analysis.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10404 - Polymer science

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Polymers

ISSN

2073-4360

e-ISSN

2073-4360

Volume of the periodical

15

Issue of the periodical within the volume

10

Country of publishing house

CH - SWITZERLAND

Number of pages

12

Pages from-to

2255

UT code for WoS article

000997113000001

EID of the result in the Scopus database

2-s2.0-85160678522