Poly(Ethylene Terephthalate) Films with Different Content of Acid-Base Functionalities. I. Surface Modifications

Gheorghiu, Mariana; Pascu, Mihaela; Popa, G.; Vasile, Cornelia; Mazur, V. G.

doi:10.1080/00914039808034841

Cited by 5 publications

(2 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, the strong inductive effect of the fluorine atoms polarizes the electronic distribution of partially fluorinated polymers [22]. The results for PET are in accordance with published literature [23] wherein it is classified as a basic polymer due to its ester functional groups. For the case of PP, we find a deviation in the magnitude of the polar surface energy component, which was expected to be zero since pure PP is a nonpolar polymer.…”

Section: Surface Energy Components -144supporting

confidence: 89%

Mechanical behaviour and practical adhesion at a bamboo composite interface: Physical adhesion and mechanical interlocking

Fuentes

Brughmans

Tran

et al. 2015

Composites Science and Technology

View full text Add to dashboard Cite

Physical adhesion was experimentally determined by measuring contact angles with different liquids on bamboo and glass fibers, using the Wilhelmy technique, and by applying the acid-base theory for calculating the surface energy components and the theoretical work of adhesion. The mechanical strength of the interfaces was assessed by single fibre pull-out tests. In order to consider the real mechanisms of interfacial failure of natural fiber composites, the fibre matrix interfacial bond strength was characterized by the critical local value of interfacial shear stress, , and the radial normal stress at the interface, σult, at the moment of crack initiation. Both interfacial parameters are used for correlating thermodynamic work of adhesion and practical adhesion. Pull-out tests (taking into account friction), XPS, and profilometry techniques were used to study the influence of rough natural fibre surfaces on the interface between the fibre and a thermoplastic matrix, by comparing the mechanical behaviour at the interface of a smooth optical glass fibre with that of rough natural fibres. The results suggest that the physical and chemical compatibility between the bamboo fibre and the matrix does not improve substantially the composite performance if compared with glass composites. The relatively low off-axis strength of the bamboo fibres is suggested as the main reason for the low stress transfer capability at the fibre-matrix interphase.Furthermore, the pull-out process may be friction-dominated in bamboo fibre systems.

show abstract

Section: Surface Energy Components -144supporting

confidence: 89%

Mechanical behaviour and practical adhesion at a bamboo composite interface: Physical adhesion and mechanical interlocking

Fuentes

Brughmans

Tran

et al. 2015

Composites Science and Technology

View full text Add to dashboard Cite

show abstract

“…This last assumption is sustained by an oligomer content of about 2.4% having been found by spectral methods. The inhomogeneity of the untreated PET films also manifested itself in the ATR-IR and x-ray diffraction (grazing incidence geometry) data [8]. No trace of nitrogen could be detected by XPS in the pristine polymer.…”

Section: Surface Functionalizationmentioning

confidence: 95%

Surface cross linking and functionalization of poly(ethylene terephthalate) in a helium discharge

Gheorghiu

Aréfï

Amouroux

et al. 1997

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

Films of poly(ethylene terephthalate) (PET) have been subjected to a low frequency (70 kHz) helium discharge, with a non-symmetrical configuration of electrodes, in order to study the treatment conditions for which the 'ageing' effect is slowed down. Treatments were made for different gas flow rates (40, 70 and 100 sccm) and different exposure times (1, 10 and 30 s). Emission spectroscopy and mass spectrometry were used to characterize the discharge plasma. The resulting modifications to the polymer surface were analysed via contact angle measurements and the XPS technique. It is pointed out that treatments on an He discharge induce both a functionalization and a cross linking of the uppermost layers of the polymer film. The residual oxygen, which partially originates within the polymer, induces surface oxidation. The cross-linked content critically depends on the residence time and concentration of implicated species. It seems that a change in the surface work function takes place as a result of a surface restructuring in the earliest stages of the reactions. This could involve an increase in the rate constant for the surface de-excitation of the helium metastables in the presence of the polymer. A contribution to the understanding of the competitive processes of cross linking and functionalization, as a function of the helium flow rate, is accomplished.

show abstract

Effect of physical adhesion on mechanical behaviour of bamboo fibre reinforced thermoplastic composites

Fuentes

Tran

Hellemont³

et al. 2013

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

Poly(Ethylene Terephthalate) Films with Different Content of Acid-Base Functionalities. I. Surface Modifications

Cited by 5 publications

References 14 publications

Mechanical behaviour and practical adhesion at a bamboo composite interface: Physical adhesion and mechanical interlocking

Mechanical behaviour and practical adhesion at a bamboo composite interface: Physical adhesion and mechanical interlocking

Surface cross linking and functionalization of poly(ethylene terephthalate) in a helium discharge

Effect of physical adhesion on mechanical behaviour of bamboo fibre reinforced thermoplastic composites

Contact Info

Product

Resources

About