Obtaining the γ phase in isotactic polypropylene: effect of catalyst system and crystallization conditions

Pérez, Ernesto; Zucchi, Debora; Sacchi, Maria Carmela; Forlini, Fabricio; Bello, A.

doi:10.1016/s0032-3861(98)00291-2

Cited by 57 publications

(63 citation statements)

References 25 publications

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“…This fact might be associated with the processing conditions imposed during the film preparation (e.g. cooling from the melt between water plates) since the proportion of g crystals is dependent on defects that interrupt isotactic sequences as well as on general crystallization conditions, diminishing at low crystallization temperatures [23] or with high cooling rates [24]. Estimation of the amorphous component content at room temperature, obtained from the totally amorphous profile of an elastomeric PP sample, allows determination of the crystallinity degree ð f WAXS Table 1 for the different films, rather constant values of crystallinity being observed independently of TiO 2 incorporation.…”

Section: Resultsmentioning

confidence: 99%

Boosting TiO2-anatase antimicrobial activity: Polymer-oxide thin films

Kubacka

Ferrer

Cerrada

et al. 2009

Applied Catalysis B: Environmental

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Section: Resultsmentioning

confidence: 99%

Boosting TiO2-anatase antimicrobial activity: Polymer-oxide thin films

Kubacka

Ferrer

Cerrada

et al. 2009

Applied Catalysis B: Environmental

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“…This fact might be associated with the processing conditions imposed during the film preparation (e.g. cooling from the melt between water plates) since the proportion of g crystals is dependent on defects that interrupt isotactic sequences as well as on general crystallization conditions, diminishing at low crystallization temperatures [23] or with high cooling rates [24]. Estimation of the amorphous component content at room temperature, obtained from the totally amorphous profile of an elastomeric PP sample, allows determination of the crystallinity degree ð f Table 1 for the different films, rather constant values of crystallinity being observed independently of TiO 2 incorporation.…”

Section: Resultsmentioning

confidence: 99%

Plasmonic Nanoparticle/Polymer Nanocomposites with Enhanced Photocatalytic Antimicrobial Properties

et al. 2009

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We present a simple method of fabricating highly efficient antibacterial nanocomposite films consisting of a commercially available ethylene−vinyl alcohol copolymer (EVOH) and embedded Ag−TiO2 nanoparticles. These systems display potent antimicrobial activity toward Gram-negative, Gram-positive bacteria/cocci (Escherichia coli 1337-H; Pseudomonas putida KT2440, Staphylococcus aureus 1341-H), and yeasts (Pichia jadini) and, moreover, show outstanding resistance to biofilm formation. These nanocomposites differ from known and similar TiO2−EVOH systems by the presence of small quantities (in the 10−2 wt. % level) of silver. Through a plasmonic effect, the presence of the noble metal significantly enhances the antimicrobial power of TiO2−EVOH systems upon ultraviolet (UV) light and opens the fruitful use of visible-light excitation sources. A joint UV−visible and photoluminescence optical characterization of the films allows an understanding of the behavior upon both UV and visible light excitations and provides evidence that the biocidal action comes from the inorganic−organic interface and takes place on the whole nanocomposite surface. These properties indicate that the films are potentially useful as antimicrobial materials in a wide variety of packaging, biomedical, and general use applications.

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“…The presence of ethylene units reduces the melting point and crystallinity by introducing irregularities into the main polymeric chain. The advantages of this class of polymers are improved transparency, relative softness, lower sealing temperature, and moderate low-temperature impact strength due to the lowered glass-transition temperature [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Cooling Rate during Crystallization on the Melting Behavior of Polypropylenes of Different Chemical Structure

Lukanina¹,

Хватов²,

Kolesnikova³

et al. 2016

ChChT

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Abstract. The melting behavior of polypropylenes of different chemical structure (isotactic homopolypropylene, propylene-based block and random copolymers and maleic anhydride grafted polypropylene) was studied by differential scanning calorimeter (DSC) and optical microscopy. Melting behavior and the crystal structure of polypropylene and its copolymers were observed depending on the crystallization rate, chemical nature of co-monomer unites and regularity of co-monomer units arrangement in the polypropylene main chain.

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Obtaining the γ phase in isotactic polypropylene: effect of catalyst system and crystallization conditions

Cited by 57 publications

References 25 publications

Boosting TiO2-anatase antimicrobial activity: Polymer-oxide thin films

Boosting TiO2-anatase antimicrobial activity: Polymer-oxide thin films

Plasmonic Nanoparticle/Polymer Nanocomposites with Enhanced Photocatalytic Antimicrobial Properties

The Effect of Cooling Rate during Crystallization on the Melting Behavior of Polypropylenes of Different Chemical Structure

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