Multilayer two-dimensional Lignin/ZnO composites with excellent anti-UV aging properties for polymer films

Effect of three de-icing additives: NaCl, wrapped NaCl (W-NaCl) and Layered double hydroxides (LDHs) on thermo-oxidative and ultraviolet aging properties of bitumen were investigated by thin film oven test (TFOT), pressure aging vessel (PAV) and ultraviolet (UV) radiation test. The experimental result illustrated that compared with bitumen with MF, the softening point and viscosity of bitumen with NaCl and W-NaCl increased and the ductility decreased distinctly after TFOT, PAV and UV aging, indicating that NaCl and W-NaCl accelerated the aging of bitumen. However, for bitumen with LDHs, the softening point and viscosity decreased significantly, the ductility increased after aging, which demonstrated that the anti-aging properties of bitumen were improved effectively by LDHs.

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Study on Ultraviolet Aging Mechanism of Carbon Nanotubes/SBS Composite-Modified Asphalt in Two-Dimensional Infrared Correlation Spectroscopy

Materials ◽

10.3390/ma14195672 ◽

2021 ◽

Vol 14 (19) ◽

pp. 5672

Author(s):

Xuewen Zheng ◽

Wenyuan Xu ◽

Shuangrui Xie

Keyword(s):

Carbon Nanotubes ◽

Functional Groups ◽

Asphalt Binder ◽

Correlation Spectroscopy ◽

Two Dimensional ◽

Uv Aging ◽

Modified Asphalt ◽

Correlation Spectrum ◽

Modified Asphalt Binder ◽

Sbs Modified Asphalt

In order to explore the influence mechanism of carbon nanotubes on the ultraviolet (UV) aging properties of the SBS-modified asphalt binder, the changes of functional groups in the one-dimensional infrared spectrum and two-dimensional infrared correlation spectrum are studied in this paper. The results show that the UV aging process of the SBS-modified asphalt binder is the process of alkane chain cleavage and reorganization, the formation of oxygen-containing functional groups and decomposition of SBS. The incorporation of carbon nanotubes can reduce the mutual conversion of methyl and methylene functional groups, inhibit the decomposition of butadiene and the destruction of C = C double bonds in SBS. The degradation of SBS during the process of UV aging leads to the change of many functional groups and acceleration of the aging of the SBS-modified asphalt binder. The addition of carbon nanotubes can effectively alleviate the degradation of SBS and the formation of oxygen-containing functional groups at the early stage of UV aging, and reduce the influence of these two changes on other functional groups; thus, improving the anti-aging performance of the SBS-modified asphalt binder.

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Preparing two-dimensional crystalline conjugated polymer films by synergetic polymerization and self-assembly at air/water interface

Polymer Chemistry ◽

10.1039/c9py01836k ◽

2020 ◽

Vol 11 (9) ◽

pp. 1572-1579 ◽

Cited By ~ 1

Author(s):

Zhibin Shu ◽

Qing Zhang ◽

Pan Zhang ◽

Zhengsheng Qin ◽

Dan Liu ◽

...

Keyword(s):

Polymer Films ◽

Self Assembly ◽

Conjugated Polymer ◽

Water Interface ◽

Two Dimensional ◽

Molecular Order ◽

Air Water Interface

Conjugated polymer (CP) films with high molecular order are attractive in polymeric optoelectronics, but challenging.

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UV Aging Performance of Asphalt Containing LDHs

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.599.265 ◽

2014 ◽

Vol 599 ◽

pp. 265-270 ◽

Cited By ~ 1

Author(s):

Pan Fei Liu ◽

Jun Zheng ◽

Shao Peng Wu

Keyword(s):

Aging Process ◽

Complex Modulus ◽

Short Term ◽

Uv Aging ◽

Oven Test ◽

Aging Properties ◽

Aging Resistance ◽

Before And After ◽

Double Hydroxides

In this paper the effect of Layered double hydroxides (LDHs) on aging properties of asphalts was studied. The thin film oven test TFOT tests and ultraviolet (UV) aging process were used to simulate short-term and long-term aging of asphalts, respectively. After aging, the physical properties and dynamic shear rheological behaviors of LDHs modified asphalts were investigated. The viscosity of LDHs modified asphalts was measured by Brookfield viscometer before and after UV aging. After UV aging, with an increase of LDHs, softening point and viscosity value of modified asphalts decreased, while both of ductility and penetration increased, compared to base asphalts. Temperature sweep tests showed that the complex modulus of LDHs modified asphalts was lower than that of base asphalt, while phase angle was higher. The results showed that LDHs improved the UV aging resistance of the asphalt, and it could prevent asphalt from UV aging.

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