Photoinitiator grafted styrene–butadiene–styrene triblock copolymer

Wang, Guoliang; Zeng, Songjun; Ou, Encai; Yu, Puren; Yan-bing, LU; Xu, Weijian

doi:10.1016/j.msec.2010.05.004

Cited by 17 publications

(8 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, due to issues like poor thermal stability during storage, improving the performance of SBS-modified asphalt has attracted greater attention of many research groups [8,9,10]. For instance, Wu et al [11] found that 4-aminobenzophenone grafted onto SBS by free radical polymerization can effectively improve the elastic performance of pristine SBS. Cong et al [12] used benzoyl peroxide as an initiator to graft maleic anhydride onto SBS, along with enhanced high temperature performance and the storage stability of the modified asphalt.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of SBS-g-GOs-Modified Asphalt Based on a Thiol-ene Click Reaction in a Bituminous Environment

Han

Muhammad

et al. 2018

Polymers

View full text Add to dashboard Cite

Styrene-butadiene styrene graphene oxide nanoplatelets (SBS-g-GOs)-modified asphalt was prepared by reacting thiolated GOs (GOs-SH) with SBS in asphalt using a thiol-ene click reaction. The temperature resistance and mechanical properties of asphalts were analyzed by dynamic shear rheology (DSR) and multiple-stress creep-recovery (MSCR) tests, which revealed that an optimum amount of GOs-SH (0.02%) can effectively improve the low temperature and anti-rutting performance of SBS asphalt. Segregation experiments showed that SBS-g-GOs possessed good stability and dispersion in base asphalt. Fluorescence microscopy results revealed that the addition of GOs-SH promoted the formation of SBS network structure. Textural and morphological characterization of GOs-SH and SBS were achieved by Fourier transform infra-red (FT-IR) spectroscopy, energy-dispersive spectroscopy (EDS), atomic-force microscopy (AFM), X-ray diffraction (XRD), and scanning electron microscopy (SEM), while surface chemical composition was tested by X-ray photoelectron spectroscopy (XPS). Based on textural characterization data, a suitable reaction mechanism was proposed that involved the preferential reaction between GOs-SH and 1,2 C=C of SBS. The currently designed GOs-SH incorporated asphalt via thiol-ene click reaction provides new ideas for the preparation of modified asphalt with enhanced mechanical properties for target-oriented applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of SBS-g-GOs-Modified Asphalt Based on a Thiol-ene Click Reaction in a Bituminous Environment

Han

Muhammad

et al. 2018

Polymers

View full text Add to dashboard Cite

show abstract

“…Besides, the conditions of the end-capping procedure are relatively harsh; the above three reasons limit the popularization of end-functionalized modification. There are two reaction routes in branched functionalized modification of SBS: one is the substitution reaction of α-H(allylic hydrogen) associated with double bonds in PB segments, − and the other is the addition reaction of double bonds in PB segments, which is saturated by grafting different functionalized monomers, e.g., maleic anhydride (MAH), acrylic acid (AA), methyl methacrylate (MMA), ethylene oxide (EO), 4-maleimidobenzophenone (4-MBP), N-isopropylacrylamide (NIPAAM), and methylacrylic acid (MAA) . Because of the isomerization effect of butadiene during polymerization, the double bonds of PB consist of three types, i.e., 1,2-vinyls and 1,4-units (1,4- cis , and 1,4- trans ), where 1,4-units exist in the backbone chains of SBS, affecting the elasticity and flexibility, while the 1,2-vinyls are exposed to the branched chains of SBS, making them more sensitive to heat, oxidation, and ultraviolet .…”

Section: Introductionmentioning

confidence: 99%

Branched Hydroxyl Modification of SBS Using Thiol-Ene Reaction and Its Subsequent Application in Modified Asphalt

Chen

Duan

et al. 2017

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Based on the thiol-ene radical addition reaction, the branched hydroxyl functionalized modified styrene-butadiene-styrene triblock copolymer (SBS-g-OH) was prepared. According to chemical structure characterization, the order of reactivity proved that 1,2-vinyls had a priority to react with 2-mercaptoethanol (MCH) at a low functionalization degree of SBS-g-OH. A novel reaction kinetics model was set up to describe the addition reaction between MCH and 1,2-vinyls; then the effect of reaction time, temperature, and initial concentration ratio of MCH to 1,2-vinyls on functionalization degree of SBS-g-OH were investigated. Subsequently the performances of modified asphalt were investigated, where the softening point, ductility, and needle penetration of SBS-g-OH modified asphalt were almost equal to that of SBS modified asphalt, while the dispersibility of polymer in asphalt and storage stability of modified asphalt had been improved obviously using SBS-g-OH with an appropriate functionalization degree.

show abstract

“…This system is suitable for adhesives in medical applications, as excess photoinitiator couldn't migrate from sample. Wu et al [17,18] investigated the effect of grafting of photoinitiator 4-maleimidobenzophenone on SBS. They found gel fraction to be controlled by adjusting the grafting ratio and UV exposure time.…”

Section: Introductionmentioning

confidence: 99%

Photocrosslinking of styrene–isoprene–styrene; effect of benzoin and ethylene glycol dimethacrylate on physical properties

Javani

Khorasani

Abdolmaleki

et al. 2014

Journal of Adhesion Science and Technology

View full text Add to dashboard Cite

Crosslinking reaction of polymer by ultraviolet (UV) irradiation has been important in industries. In this work, photocrosslinking of styrene-isoprene-styrene (SIS) triblock copolymer in the presence of benzoin photoinitiator and a dimethacrylate monomer as crosslinking agent was investigated. Curing of samples was initiated under UV irradiation. Benzoin was used as photoinitiator because it contains chromophore group that could absorb UV irradiation. Ethylene glycol dimethacrylate (EGDMA) was used as crosslinking agent, since it has alkene functional groups that could react with the alkene group of SIS. ATR-FTIR spectra of samples show that absorption band of double bond at 1500-1600 cm −1 decreases after UV exposure. Increasing the concentration of benzoin (0.1-1 phr) and EGDMA (1-10 phr) leads to an increase in gel content and hardness, while swelling ratio decreases. After 5 min heating at 150°C, about 20%wt of the unirradiated compound became insoluble, because heating of compound at 150°C causes crosslinking reaction without any irradiation. IntroductionStyrene-isoprene-styrene (SIS) and styrene-butadiene-styrene (SBS) are triblock copolymers that have two-phase morphology and are commonly used as pressuresensitive adhesives and flexographic printing plates. In these applications, SIS or SBS should have solvent and chemical-resistance properties. Ultraviolet (UV) irradiation curing has become a well-accepted technology, which is capable of fast polymerization in solid media despite severe molecular mobility restrictions.[1] The solvent and chemical-resistance properties improved after the completion of polymerization and crosslinking of SIS or SBS copolymer. Several studies have investigated the UV-crosslinking of SIS and SBS, using various photoinitiators and crosslinking agents.Photoinitiators absorb light photons due to the presence of chromophore groups in their structures. When the photoinitiator absorbs light photons, molecules move from quantum ground state to electron-excited state. In this transition, photoinitiator changes to free radicals, which initiate the chemical reaction.

show abstract

Photoinitiator grafted styrene–butadiene–styrene triblock copolymer

Cited by 17 publications

References 32 publications

Preparation and Properties of SBS-g-GOs-Modified Asphalt Based on a Thiol-ene Click Reaction in a Bituminous Environment

Preparation and Properties of SBS-g-GOs-Modified Asphalt Based on a Thiol-ene Click Reaction in a Bituminous Environment

Branched Hydroxyl Modification of SBS Using Thiol-Ene Reaction and Its Subsequent Application in Modified Asphalt

Photocrosslinking of styrene–isoprene–styrene; effect of benzoin and ethylene glycol dimethacrylate on physical properties

Contact Info

Product

Resources

About