Temperature dependence of molecular conformation in uniaxially deformed isotactic polypropylene investigated by combination of polarized FTIR spectroscopy and 2D correlation analysis

Xu, Jia‐Zhuang; Xu, Ling; Liang, Yuanying; Zhong, Gan‐Ji; Lei, Jun; Li, Zhong‐Ming

doi:10.1002/polb.23683

Cited by 12 publications

(4 citation statements)

References 55 publications

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“…The orientation degree of the chain segment was also characterized by FTIR. The characteristic bands at 998 cm −1 are related to the crystalline regions 34 . Figure 7b shows that the orientation of the molecular chains slightly decreases from 0.58 at a roll temperature of 60°C to 0.565 at a roll temperature of 120°C.…”

Section: Resultsmentioning

confidence: 95%

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Effect of roll temperature on the structure and properties of oriented polypropylene cast film and stretched microporous membrane

Chen¹,

Chen

Yin

et al. 2023

J of Applied Polymer Sci

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The effect of roll temperature from 60 to 120°C on the crystalline structure and properties of oriented polypropylene (PP) cast films and the stretched microporous membrane was studied. It was found that the long period, the thickness of the crystalline and amorphous phase increase with the increasing roll temperature. And the regularity of the lamellar structure also improves with the increasing roll temperature. In comparison, the lamellae lateral dimension is nearly unchanged at 50 nm. The orientation of the lamellar structure slightly decreases from 0.81 to 0.76 with increasing roll temperature. The increase of the long period and the improvement of the regularity of the lamellar structure lead to the increase of the elastic recovery value of PP cast film. The corresponding microporous membrane also shows a smaller thickness of lamellar clusters, larger pores, better air permeability and better thermal shrinkage resistance. The higher roll temperature is beneficial to the perfection of the lamellar structure, obtaining the higher‐performance microporous membrane.

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Section: Resultsmentioning

confidence: 95%

“…The characteristic bands at 998 cm À1 are related to the crystalline regions. 34 structures, as the molecular chain at higher temperatures has a higher motivation ability and is easy to disorient.…”

mentioning

confidence: 99%

Effect of roll temperature on the structure and properties of oriented polypropylene cast film and stretched microporous membrane

Chen¹,

Chen

Yin

et al. 2023

J of Applied Polymer Sci

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“…The chemical structure was analyzed by Fourier infrared spectroscopy (FTIR, Thermal Scientific, Waltham, MA, USA [24]) in the wavenumber range of 4000−400 cm −1 .…”

Section: Characterizationsmentioning

confidence: 99%

Application of a Core-Shell Structure Nano Filtration Control Additive in Salt-Resistant Clay-Free Water-Based Drilling Fluid

Wang,

Li,

Qiu

et al. 2023

Polymers

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When drilling into a reservoir, the drilling fluid containing bentonite is prone to solid phase invasion, causing serious damage to the reservoir, and the conventional API barite suspension stability is poor, which makes it easy to cause sedimentation and blockage. Therefore, in order to avoid accidents, we use ultrafine barite to obtain a good suspension stability. More importantly, the method of modifying zwitterionic polymers on the surface of nano-silica is used to develop a temperature-resistant and salt-resistant fluid loss reducer FATG with a core-shell structure, and it is applied to ultra-fine clay-free water-based drilling fluid (WBDF). The results show that the filtration loss of clay-free drilling fluid containing FATG can be reduced to 8.2 mL, and AV can be reduced to 22 mPa·s. Although the viscosity is reduced, FATG can reduce the filter loss by forming a dense mud cake. The clay-free drilling fluid system obtained by further adding sepiolite can reduce the filtration loss to 3.8 mL. After aging at 220 °C for 15 d, it still has significant salt tolerance, the filtration loss is only 9 mL, the viscosity does not change much, a thinner and denser mud cake is formed, and the viscosity coefficient of the mud cake is smaller. The linear expansion test and permeability recovery evaluation were carried out. The hydration expansion inhibition rate of bentonite can reach 72.5%, and the permeability recovery rate can reach 77.9%, which can meet the long-term drilling fluid circulation work in the actual drilling process. This study can provide guidance for technical research in related fields such as reservoir protection.

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“…The polarized FTIR spectra of polypropylene are shown in Figures 7(a) and 7(b). The absorption at the wavenumber of 998 cm −1 is attributed to the crystalline phase (c-axis) while absorption at the wavenumber of 972 cm −1 is due to the contribution of both crystalline and amorphous phases [38]. The Herman orientation function was calculated according to the dichroic 7(c) and 7(d).…”

Section: Wide-angel X-ray Diffraction Figures 4(a) and 4(b)mentioning

confidence: 99%

The Effect of Annealing on the Structure and Electric Performance of Polypropylene Films

Dai

Xing

Yang

et al. 2022

International Journal of Polymer Science

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Biaxially oriented polypropylene (BOPP) and uniaxially oriented polypropylene (UOPP) films were annealed. The effect of annealing temperature (Ta) on dielectric strength was studied. The electric breakdown strength (Eb) of BOPP and UOPP films changes in a quite different trend with the annealing process. Eb of BOPP films decreases with the increase in Ta, whereas Eb of UOPP films increases first and then decreases with Ta. The structural changes during annealing were investigated. The crystallinity rises with Ta, while the orientation degree and Eb show a similar trend with Ta. Although the crystallinity and crystal structure can affect Eb of polypropylene films, the orientation of chain segments has a much larger correlation with Eb. Our results indicate that the deterioration of the metallized BOPP film capacitor may originate from the orientation degree decrease of chain segments after experiencing high temperature.

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Temperature dependence of molecular conformation in uniaxially deformed isotactic polypropylene investigated by combination of polarized FTIR spectroscopy and 2D correlation analysis

Cited by 12 publications

References 55 publications

Effect of roll temperature on the structure and properties of oriented polypropylene cast film and stretched microporous membrane

Effect of roll temperature on the structure and properties of oriented polypropylene cast film and stretched microporous membrane

Application of a Core-Shell Structure Nano Filtration Control Additive in Salt-Resistant Clay-Free Water-Based Drilling Fluid

The Effect of Annealing on the Structure and Electric Performance of Polypropylene Films

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