Raman Structural Study of Copolymers of Propylene with Ethylene and High Olefins

Chernyshov, Konstantin; Gen, D. E.; Shemouratov, Yuri; Prokhorov, K. A.; Nikolaeva, G. Yu.; Sagitova, E.A.; Пашинин, П. П.; Kovalchuk, Anton; Klyamkina, A. N.; Недорезова, П. М.; Shklyaruk, B. F.; Optov, V. A.

doi:10.1002/masy.201051067

Cited by 13 publications

(16 citation statements)

References 12 publications

(31 reference statements)

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“…c) show additional vibrational bands at 1060, 1080, 1130, 1290, and 1412 cm −1 characteristic of PE . These bands match with the presence of a PP + PE blend instead of only coPP/PE in skin tape, since the Raman spectra of coPP/PE do not show PE peaks.…”

Section: Resultsmentioning

confidence: 67%

The morphological properties of PP coextruded tape fabrics

Marsich

Ferluga

Venturini

et al. 2016

Polymer Engineering & Sci

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In the field of self-reinforced composites many researchers have focused their attention on the coextruded tapes composed of polypropylene core and PP/PE copolymer skin. Two similar commercial fabrics (P and T) have been compared in respect of their peel resistance. For both materials, peel resistance has a periodic trend that regularly follows fabric weave style. T has demonstrated an average peel resistance and a well-bonded area slightly greater than P. Skin/core interfacial properties have been investigated and a crosscheck between differential scanning calorimetry (DSC) and Raman spectroscopy has been adopted to understand the influence of skin structure on consolidated laminate. DSC curves exhibit three melting peaks during first heating for both fabrics, corresponding to copolymer, skin/core interface, and core melting. After consolidation at 140°C stretching-induced superstructure and PP crystallinity degree are preserved. The presence of PP/PE copolymer + PE blend only in fabric P has been pointed out and PE content has been calculated. POLYM. ENG. SCI., 2016. © 2016 Society of Plastics Engineer

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Section: Resultsmentioning

confidence: 67%

The morphological properties of PP coextruded tape fabrics

Marsich

Ferluga

Venturini

et al. 2016

Polymer Engineering & Sci

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“…Similarly, with the increase in comonomer content the band at 1166 cm À1 merges with the more intense band at 1126 cm À1 . The alkyl branches of the comonomer are not able to enter the crystal lattice, 22 and hence, an increase in the fraction of a a and a b is observed.…”

Section: Resultsmentioning

confidence: 99%

“…14,15 PE/polypropylene (PP) blends have also been quantied and being thermodynamically immiscible, 16 the phase composition and crystallinity for the individual blend components has also been determined. 22 The rst of these bands corresponds to vibrations of the helically oriented PP chains in the crystalline phase, while the second one is associated with vibrations of the helically aligned PP chains with signicant amounts of conformational defects, localized in the amorphous phase. [18][19][20] The internal mode region of the spectrum has been grouped into three frequency regions, namely the C-C stretching region between 1000 cm À1 and 1200 cm À1 , the CH 2 twisting modes near 1300 cm À1 and the CH 2 bending modes between 1400 cm À1 and 1500 cm À1 .…”

Section: Introductionmentioning

confidence: 99%

“…For copolymers of propylene with 1-olens, changes in the intensity of the bands at 809 cm À1 and 841 cm À1 were observed with increasing content of the incorporated comonomer. 22 The rst of these bands corresponds to vibrations of the helically oriented PP chains in the crystalline phase, while the second one is associated with vibrations of the helically aligned PP chains with signicant amounts of conformational defects, localized in the amorphous phase. When small amounts (0-20 mol%) of 1-olenic comonomers are copolymerized with ethylene, the changes reected in the Raman spectra are minute, and these nite details have not gained much attention to be useful for any quantication.…”

Section: Introductionmentioning

confidence: 99%

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Raman spectroscopy as a non-destructive tool to quantify the comonomer content in ethylene/1-olefin copolymers

2015

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Ethylene/1-olefin copolymers, ranging from 1-butene to 1-octadecene, have been studied with Raman spectroscopy and the spectral changes upon comonomer incorporation have been analyzed. The Raman spectra of ethylene/1-olefin copolymers are characterized by a band ensemble in the lower frequency region below 1000 cm-1 which is a characteristic scattering from the comonomer segments. The spectra show bands due to scattering from the polyethylene sequences which also reflect the effect of the morphological changes occurring with the increasing comonomer content. By correlating the bands characteristic of the comonomer to those of the ethylene sequences, an internal intensity standard was identified. This also caters to the effect of the experimental parameters such as sample focus and spectral acquisition time for calibration of the comonomer content. This approach was also extended to amorphous ethylene/norbornene copolymers and a similar method for quantification was developed. The major advantages of this method are the minimum amount of sample preparation, and the low sample size, enabling even micrograms of the sample to be measured. Due to these, quantification with Raman spectroscopy is uniquely suited for online quality control and liquid chromatography which require a fast and robust analytical methodology

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“…Raman spectroscopy has also been performed in order to assess photo‐oxidation by‐products because it is sensitive for the identification of species characterized by vinyl groups …”

Section: Introductionmentioning

confidence: 99%

The influence of consolidation and artificial weathering on all‐PP composite behavior

Ferluga

Caniato

Sbaizero

2014

J of Applied Polymer Sci

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The purpose of this work was to evaluate the effect of consolidation parameters on the mechanical properties of all-polypropylene composites. Consolidation time does not induce any significant influence, whereas processing temperature and in particular coextruded tape characteristics deeply affect laminate performance. The DSC analysis demonstrated that the proximity of copolymer and homopolymer melting points results in a reduction in the operating window. This suggests the implementation of a more effective temperature control during thermoforming to avoid reinforcement relaxation and localized melting. Artificial weathering was conducted under noon summer light condition to assess the effect of ultraviolet exposure on laminates. After 100 and 250 h, sample performance drops significantly, with overall strength and elongation reduction up to 70 and 88%, respectively. Low molecular weight by-products were identified using Raman spectroscopy on specimens surface, confirming the mechanical property decrement due to photo-oxidation process

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Raman Structural Study of Copolymers of Propylene with Ethylene and High Olefins

Cited by 13 publications

References 12 publications

The morphological properties of PP coextruded tape fabrics

The morphological properties of PP coextruded tape fabrics

Raman spectroscopy as a non-destructive tool to quantify the comonomer content in ethylene/1-olefin copolymers

The influence of consolidation and artificial weathering on all‐PP composite behavior

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