Mechanical Properties and Morphology of Nitrile Rubber Toughened Polystyrene

Sreenivasan, P. V.; Kurian, Philip

doi:10.1080/00914030701215701

Cited by 13 publications

(13 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…PECA-2.5 demonstrated much better elastic properties than PECA-5 and this could be due to the increased number of rubbery domains in PECA-5 with more interfacial adhesion failure sites that can cause elongation failure. This is also observed in rubber-modified rigid polymers and studies indicate that proper modification of interfacial adhesion diminishes early breaks during elongation [ 36 ]. Adding caffeic acid to PECA-2.5 (PECA2.5-1) did not affect the elastic modulus of the blend but elongation was reduced to about 10%, instead.…”

Section: Resultsmentioning

confidence: 70%

UV-Blocking, Transparent, and Antioxidant Polycyanoacrylate Films

2020

View full text Add to dashboard Cite

Applications of cyanoacrylate monomers are generally limited to adhesives/glues (instant or superglues) and forensic sciences. They tend to polymerize rapidly into rigid structures when exposed to trace amounts of moisture. Transforming cyanoacrylate monomers into transparent polymeric films or coatings can open up several new applications, as they are biocompatible, biodegradable and have surgical uses. Like other acrylics, cyanoacrylate polymers are glassy and rigid. To circumvent this, we prepared transparent cyanoacrylate films by solvent casting from a readily biodegrade solvent, cyclopentanone. To improve the ductility of the films, poly(propylene carbonate) (PPC) biopolymer was used as an additive (maximum 5 wt.%) while maintaining transparency. Additionally, ductile films were functionalized with caffeic acid (maximum 2 wt.%), with no loss of transparency while establishing highly effective double functionality, i.e., antioxidant effect and effective UV-absorbing capability. Less than 25 mg antioxidant caffeic acid release per gram film was achieved within a 24-h period, conforming to food safety regulations. Within 2 h, films achieved 100% radical inhibition levels. Films displayed zero UVC (100–280 nm) and UVB (280–315 nm), and ~15% UVA (315–400 nm) radiation transmittance comparable to advanced sunscreen materials containing ZnO nanoparticles or quantum dots. Transparent films also exhibited promising water vapor and oxygen barrier properties, outperforming low-density polyethylene (LPDE) films. Several potential applications can be envisioned such as films for fatty food preservation, biofilms for sun screening, and biomedical films for free-radical inhibition.

show abstract

Section: Resultsmentioning

confidence: 70%

UV-Blocking, Transparent, and Antioxidant Polycyanoacrylate Films

2020

View full text Add to dashboard Cite

show abstract

“…We observed that enhancement in impact strength versus rubber content has an optimum value. This was further confirmed in a research by Kurian and his coworker who investigated on the toughening behavior of PS/nitrile rubber blends . They found an optimum amount of 10% for nitrile rubber incorporation into PS matrix.…”

Section: Resultsmentioning

confidence: 72%

“…superior breaking stress of PS (50 MPa) compared with PS/rubber10 blends(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32) reflected the brittleness of the polymer, which did not reach its yield point under the testing conditions used here.The elongation at break of the studied blends progressively increased, while elastic Young's modulus monotonically decreased. To distinguish the curves of the blends, the highest amount of yield stress and extension is seen for PS/COPOLY sample.…”

mentioning

confidence: 86%

New high impact polystyrene: Use of poly(1‐hexene) and poly(1‐hexene‐co‐hexadiene) as impact modifiers

Nazari

Bahri‐Laleh

Nekoomanesh‐Haghighi

et al. 2018

Polymers for Advanced Techs

View full text Add to dashboard Cite

In this study, polystyrene (PS) was melt blended with different amounts of poly1‐hexene (PH) and poly(1‐hexene‐co‐hexadiene) (COPOLY) and the blends were compared with conventional PS/polybutadiene (PS/PB) one. Scanning electron microscope revealed that the dispersion of PH and COPOLY in PS matrix was more uniform with the appearance of small particles in PS matrix; however, in the case of PS/PB blends, the fracture surface showed nonhomogenous morphology with the appearance of bigger rubber particles. Based on Differential Scanning Calorimetry (DSC) and dynamic mechanical thermal analysis results, Tg of the blends decreased in comparison with it in neat PS. Impact strength of PS/PH and PS/COPOLY blends was considerably higher than that in PS/PB and significantly higher than the value for neat PS. Tensile test showed substantial improvement in stress at yield and better elongation at break for COPOLY containing blend than the samples containing PH and PB rubbers. Also, blending of PS with 10% of the rubbers was considered in the presence of dicumylperoxide as a probable grafting/cross‐linking agent to produce XPS/COPOLY10 and XPS/PB10 samples, respectively. IR results of the nonsoluble solvent extracted gel showed that COPOLY and PB were grafted to PS matrix during melt blending, which caused higher impact strength in the related samples.

show abstract

“…Consequently, rubber toughening is often used to overcome the brittleness of glassy polymers such as polystyrene (PS). Polystyrene has been toughened by blending with rubbers such as styrene-butadiene (SBR) [3], natural rubber (NR) [4], polybutadiene (BR) [5], ethylene-propylene-diene terpolymer (EPDM) [6] and nitrile rubber (NBR) [7]. A major improvement in toughness is obtained when the rubber particles are small (1)(2)(3)(4) …”

Section: Introductionmentioning

confidence: 99%