Enhancement of UV Resistance and Thermal Stability of the Unsaturated Polyester Material by Introducing MHHPA Fragment into the Molecular Skeleton

2021 ◽  
pp. 428-436
Author(s):  
Nang Xuan Ho ◽  
Tuan Anh Pham ◽  
Huong Thu Ha ◽  
Thuc Quang Dong ◽  
Nam Hoai Nguyen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Unsaturated Polyester ◽  
Uv Resistance ◽  
Polyester Material ◽  
Molecular Skeleton ◽  
Thermal Stability Of

Thermal Gravimetric Analysis of Unsaturated Polyesters Filled with Alumina Trihydrate and Silica Aerogel

2017 ◽  
Vol 264 ◽  
pp. 116-119 ◽  
Author(s):  
Zulhelmi Alif Abdul Halim ◽  
Muhamad Azizi Mat Yajid ◽  
Mohd Hasbullah Idris ◽  
Halimaton Hamdan
Keyword(s):  
Thermal Stability ◽  
Thermal Gravimetric Analysis ◽  
Silica Aerogel ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Polyester Matrix ◽  
Alumina Trihydrate ◽  
Thermal Stability Of

Thermal degradation of the composite blend consisting unsaturated polyester resin, alumina trihydrate and silica aerogel was studied using thermal gravimetric analysis. Composite filled with silica aerogel show lower density and slightly improve the thermal stability of the pure polymer. The addition of alumina trihydrate slows down the degradation of the polymer due to the release of bond water while the combination of silica aerogel and alumina trihydrate in polyester matrix does not interrupt the function of alumina trihydrate due to inert properties of silica aerogel.

Synthesis and Characterization of Functional Cholesteryl Substituted Luminol Derivative

2011 ◽  
Vol 694 ◽  
pp. 565-569 ◽  
Author(s):  
Ti Feng Jiao ◽  
Yuan Yuan Xing ◽  
Jing Xin Zhou
Keyword(s):  
Molecular Structure ◽  
Thermal Stability ◽  
Functional Material ◽  
Substituent Group ◽  
The Difference ◽  
Imide Group ◽  
Luminol Derivative ◽  
Molecular Skeleton ◽  
Thermal Stability Of

Functional luminol derivative with cholesteryl substituted group has been designed and synthesized from the reaction of the corresponding precursor cholesteryl chloroformate with luminol. It has been found that depending on cholesteryl substituted group, the formed luminol derivative showed different properties, indicating distinct regulation of molecular skeleton. UV and IR data confirmed commonly the formation of imide group as well as cholesteryl segment in molecular structure. Thermal analysis showed that the thermal stability of luminol derivative with cholesteryl segment was different from luminol. The difference of thermal stability is mainly attributed to the formation of imide group and cholesteryl substituent group in molecular structure. The present results have demonstrated that the special properties of luminol derivative can be turned by modifying molecular structure of objective compound with proper substituted groups, which show potential application in functional material fields such as liquid crystal and ECL sensor.

scholarly journals Contribution of Different Pretreatments to the Thermal Stability and UV Resistance Performance of Cellulose Nanofiber Films

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 247
Author(s):  
Lianxin Luo ◽  
Xuchong Wang ◽  
Sheng Zhang ◽  
Xiaojun Yuan ◽  
Mingfu Li ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Cellulose Nanofibers ◽  
Hot Water ◽  
Sodium Chlorite ◽  
Uv Resistance ◽  
Green Liquor ◽  
Ultraviolet Resistance ◽  
Cnf Films ◽  
Resistance Performance ◽  
Thermal Stability Of

Hot water (HW), green liquor (GL), and sodium chlorite (SC) pretreatments were used to pretreat sugarcane bagasse (SCB) and spruce (SP) and then to prepare cellulose nanofibers (CNFs) through high-pressure homogenization to explore the effect of physicochemical properties on the thermal stability and ultraviolet (UV) resistance performance of CNF films. The results indicated that the lignin content of HW-pretreated CNFs was higher than that of GL- and SC-pretreated CNFs, and the hemicellulose content of HW-pretreated CNFs was lower than that of GL- and SC-pretreated CNFs. The synergy of lignin and hemicellulose impacted the thermal stability of CNF films. The thermal stability of all the SP CNF films was higher than that of all the SCB CNF films. Hot water pretreatment improved the thermal stability of CNF films, and green liquor and sodium chlorite pretreatment decreased the thermal stability of CNF films. The highest thermal stability of SP-HW CNF films reached 392 °C, which was 5.4% higher than that of SP-SC CNF films. Furthermore, the ultraviolet resistance properties of different CNF films were as follows: SCB-HW > SCB-GL > SCB-SC and SP-HW > SP-GL > SP-SC. Green liquor pretreatment is an effective method to prepare CNFs. Conclusively, this research provides a basic theory for the preparation of CNFs and allows the improvement of CNF films in the application of thermal stability management and UV resistance fields.

scholarly journals Flame retardation performances of phosphorus-containing compounds in unsaturated polyester

2015 ◽  
Vol 18 (3) ◽  
pp. 145-152
Author(s):  
Huyen Thi Thu Nguyen ◽  
Linh Thi Thuy Pham ◽  
Quy Thi Dong Hoang
Keyword(s):  
Thermal Stability ◽  
Fire Resistance ◽  
Flame Retardants ◽  
Unsaturated Polyester ◽  
Hydrogen Phosphite ◽  
Char Layer ◽  
Phosphorus Containing ◽  
Flame Retardant Properties ◽  
Flame Retardation ◽  
Thermal Stability Of

Aluminium hydrogen phosphite (AHP) was synthesized in order to investigate their flame retarding performances for unsaturated polyester (UP). AHP and triphenyl phosphate (TPP) flame retardants were studied to increase fire resistance and thermal stability of materials. UL 94HB rating is achieved at 15 wt% AHP - 15 wt% TPP loading. Sample with 30 wt% loading of AHP has the burning rate slower than that of neat UP. The incorporation of FR increases the flame retardant properties as well as the amounts of charred residues protecting the mixture from further degradation. This assertion can be accepted when observing that the char yield of UP/FR mixtures at 500-650 oC is much higher than that of neat UP. The char layer may limit the amount of fuel available and insulate the underlying polymer from the flame and, thus, make further degradation more difficult.

Influence of reactive POSS and DDP on thermal stability and flame retardance of UPR nanocomposites

e-Polymers ◽  
2017 ◽  
Vol 17 (6) ◽  
pp. 463-470 ◽  
Author(s):  
Yongqian Nie ◽  
Xuanxi Leng ◽  
Yixue Jiang ◽  
Shigan Chai ◽  
Jinzhi Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Oxygen Index ◽  
Unsaturated Polyester ◽  
Flame Retardance ◽  
Polyester Resins ◽  
Limited Oxygen Index ◽  
Chemical Structures ◽  
Melt Condensation ◽  
Thermal Stability Of ◽  
Limited Oxygen

AbstractUnsaturated polyester resins (UPR) were prepared by the melt condensation method based on adipic acid, o-phthalic anhydride, maleic anhydride and ethylene glycol in the presence of PSS-(2,3-propanediol)propoxy-heptaisobutyl substituted (PSS-POSS) or/and 9 wt% [(6-oxide-6H-dibenz(c,e)(1,2)oxaphosphorin-6-yl)methyl]butanedioic (DDP). We synthesized UPR containing DDP (DDP-UPR) and UPR containing both DDP and PSS-POSS (DDP-PSS-POSS-UPR series). The chemical structures of the modified polyesters were characterized and confirmed by Fourier transform infrared (FTIR) and 31P nuclear magnetic resonance (31P NMR). The thermal stability and flammability behaviors of UPR were evaluated by thermogravimetric analysis (TGA) and limited oxygen index (LOI) and the vertical burning test. The morphology of residual char of UPR was shown by scanning electron microscopy (SEM). The results indicate that the incorporation of PSS-POSS has little influence on the thermal stability of DDP-UPR, but enhances the flame retardance of DDP-UPR, and when the PSS-POSS content reaches 10 wt%, the DDP-PSS-POSS-UPR has better flame retardance.

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