Modification of isotactic polypropylene film by radiation-induced graft copolymerization

Sehgal, Teena; Rattan, Sunita

doi:10.1007/s10967-010-0626-1

Cited by 14 publications

(13 citation statements)

References 15 publications

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“…It should be noted that we observed the decay of the reaction rate beyond 2 h and the reaction rate equal to zero beyond 5 h (data not shown). In addition, a few researchers attribute the time influence to free radicals having more time in the reaction, resulting in increases in both conversion and grafting amount 43, 44…”

Section: Resultsmentioning

confidence: 99%

Prediction of mechanical properties of compatibilized styrene/natural‐rubber blend by using reaction conditions: Central composite design vs. artificial neural networks

Sresungsuwan

Hansupalak

2012

J of Applied Polymer Sci

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A polystyrene (PS)/rubber blend compatibilized with PS-g-rubber copolymer, prepared via emulsion polymerization using redox initiator system, is used to investigate the utilization of central composite design (CCD) and artificial neural network (ANN) approaches in correlating polymerization conditions to mechanical properties (tensile strength and abrasion loss) of unfilled compound vulcanizates. The conditions were manipulated by changing four factors: reaction temperature and time, percentage of deproteinized rubber in the mixture containing natural rubber, and amount of chain transfer agent. The results show that the relationships between the conditions and the mechanical properties for compatibilized PS/rubber blend are too complex to be explained by polynomials, but are well described by the ANN models, developed for each response. In addition, simulation results for the tensile strength response as a function of those factors using the obtained ANN are in agreement with literature, whereas those results for the abrasion loss do not quite agree with literature due to the interference of the large measurement error. This suggests that only experimental data with high precision should be used to train an ANN to achieve a model with not only best performance but also high reliability.

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Section: Resultsmentioning

confidence: 99%

Prediction of mechanical properties of compatibilized styrene/natural‐rubber blend by using reaction conditions: Central composite design vs. artificial neural networks

Sresungsuwan

Hansupalak

2012

J of Applied Polymer Sci

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“…Due to this advantage, γ-rays are suitable for preparation of pore-filled membranes, integrating the mechanical strength of the substrate with the high conductivity of polymer electrolyte for ion exchange applications, such as fuel cell [ 200 ], ED [ 201 ], and RED [ 202 ]. Nevertheless, several studies considered the utilization of this graft copolymerization technique for pressure driven membrane processes, which makes this technique, as applied to fouling prevention, appealing [ 203 , 204 , 205 , 206 , 207 , 208 , 209 , 210 , 211 , 212 , 213 ]. The early study by Shim et al [ 209 ] reported the modification of the surface of porous PP membranes by RIGC of HEMA using γ-rays.…”

Section: Progress In Application Of Rigc For Fouling Preventionmentioning

confidence: 99%

“…In another study, Sehgal and Rattan [ 205 ] studied the RIGC of MMA onto irradiated isotactic PP membrane via peroxidation method, starting with γ-rays’ irradiation from a Co60 source to fabricate a PP- g -poly(MMA) membrane. The reaction conditions were manipulated to promote graft copolymerization over homopolymerization, which is very possible because of monomer’s high reactivity.…”

Section: Progress In Application Of Rigc For Fouling Preventionmentioning

confidence: 99%

Fouling Prevention in Polymeric Membranes by Radiation Induced Graft Copolymerization

2022

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The application of membrane processes in various fields has now undergone accelerated developments, despite the presence of some hurdles impacting the process efficiency. Fouling is arguably the main hindrance for a wider implementation of polymeric membranes, particularly in pressure-driven membrane processes, causing higher costs of energy, operation, and maintenance. Radiation induced graft copolymerization (RIGC) is a powerful versatile technique for covalently imparting selected chemical functionalities to membrane surfaces, providing a potential solution to fouling problems. This article aims to systematically review the progress in modifications of polymeric membranes by RIGC of polar monomers onto membranes using various low- and high-energy radiation sources (UV, plasma, γ-rays, and electron beam) for fouling prevention. The feasibility of the modification method with respect to physico-chemical and antifouling properties of the membrane is discussed. Furthermore, the major challenges to the modified membranes in terms of sustainability are outlined and the future research directions are also highlighted. It is expected that this review would attract the attention of membrane developers, users, researchers, and scientists to appreciate the merits of using RIGC for modifying polymeric membranes to mitigate the fouling issue, increase membrane lifespan, and enhance the membrane system efficiency.

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“…Their polydispersities are in the range 1.171–1.565 indicating that the polymer chains have close molecular weights. The degrees of grafting of the prepared polymer conjugates are shown in Table 1 as previously described 68,69 . Grafted polymer conjugates revealed a reasonable grafting degrees ranging within 26%–58%.…”

Section: Resultsmentioning

confidence: 83%

Synthesis, characterization, and biological activities of folic acid conjugates with polyvinyl alcohol, chitosan, and cellulose

El‐Naggar

El‐Barbary

Salama

et al. 2022

J of Applied Polymer Sci

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Polyvinyl alcohol (PVA), chitosan (CS), and cellulose (CL) are promising polymers for chemical functionalization and biomedical applications. This study aimed to synthesize folic acid (FA) conjugates with PVA, CS, and CL via chloroacetyl chloride, 2-bromopropionyl bromide, and epichlorohydrin to enhance it biomedical applications. The functionalized polymer conjugates were characterized by FT-IR, 1 H-NMR, GPC, and TGA techniques. FT-IR and 1 H-NMR revealed the main functional groups (O H, N H, C═O, C═N), the aromatic C H and N H protons of FA moieties. TGA illustrated two stages of decompositions of all-polymer conjugates. FA showed no antifungal activity, while two of the newly grafted polymer conjugates (chitosan bromopropionate-grafted FA and cellulose chloroacetate-grafted FA) illustrated antifungal activity against both Aspergillus fumigatus and Candida albicans. Polymer conjugates; poly(vinyl chloroacetate)-grafted FA and chitosan-EPCH-grafted FA revealed good antifungal effect on C. albicans and A. fumigatus, respectively. Most FA polymer conjugates showed significant antitumor activity against EAC-bearing mice. Among these conjugates, chitosan chloroacetate-grafted FA (P-2A) showed the highest antitumor effect against EAC-bearing mice via reduction in total tumor volume. Thus, these conjugates provided enhanced antifungal and antitumor activities as compared with FA itself. These conjugates may act as promising biologically active carrier systems for other applications such as drug delivery.

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Modification of isotactic polypropylene film by radiation-induced graft copolymerization

Cited by 14 publications

References 15 publications

Prediction of mechanical properties of compatibilized styrene/natural‐rubber blend by using reaction conditions: Central composite design vs. artificial neural networks

Prediction of mechanical properties of compatibilized styrene/natural‐rubber blend by using reaction conditions: Central composite design vs. artificial neural networks

Fouling Prevention in Polymeric Membranes by Radiation Induced Graft Copolymerization

Synthesis, characterization, and biological activities of folic acid conjugates with polyvinyl alcohol, chitosan, and cellulose

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