Synthesis and Characterization of Poly(butylenes succinate) with Control Different End-Group

2012 ◽  
Vol 430-432 ◽  
pp. 497-500 ◽  
Author(s):  
Chun Na Cui ◽  
Ji Tao Huang
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Thermal Properties ◽  
Acid Ester ◽  
Chemical Structure ◽  
Starting Material ◽  
Synthesis And Characterization ◽  
End Group

Poly (butylenes succinate) (PBS) was synthesized by using1, 4-butanediol and succinate as starting material, titanic acid ester and acetate as catalyst, and tried to improve PBS by changing end-group to carboxyl, hydroxyl and chlorine. The results of GPC showed, molecular weight of four kinds of polymer was all beyond seventy thousand; chemical structure of the polymer was measured by FTIR and nitrogen/sulfur/chlorine elementary analyzer; PBS controlled end-group had better thermal properties by DSC and TG; different end-group had influenced mechanical properties; and biodegradability experiment results showed biodegradable speed of PBS can be controlled by changing their end-group.

Synthesis and Characterization of PLA-Based Aliphatic-Aromatic Copolyesters: Effect of Diols

2008 ◽  
Vol 55-57 ◽  
pp. 785-788
Author(s):  
M. Namkajorn ◽  
Atitsa Petchsuk ◽  
Mantana Opaprakasit ◽  
Pakorn Opaprakasit
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Lactic Acid ◽  
Chemical Structure ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Polycondensation Reaction ◽  
Dimethyl Terephthalate ◽  
Aromatic Species

PLA-based aliphatic aromatic copolyesters have been synthesized and characterized in order to incorporate the degradability of PLA and good mechanical properties of aromatic species. Synthesis of the copolymers was conducted by polycondensation of lactic acid with dimethyl terephthalate (DMT) and various diols using stannous(II) octoate as a catalyst. Three types of diols with different methylene lengths were employed, i.e., ethylene glycol (EG), propylene glycol (PG) and 1, 4-butanediol (BD). Effects of diols and comonomer molar ratio on the extent of polycondensation reaction and molecular weight of the resulting copolymers were investigated. Diacids and diol ratios of L-lactic acid (LLA), dimethyl terephthalate (DMT) and diol of 1/1/2, 1/2/4 and 2/1/2 were employed. Characterization of chemical structure, molecular weight and thermal and physical properties of the resulting copolymers were conducted by FTIR, NMR, and DSC.

Synthesis and Characterization of Novel Degradable Responsive Polyurethane Microsphere

2013 ◽  
Vol 750-752 ◽  
pp. 1271-1275 ◽  
Author(s):  
Lian Hai Shan ◽  
Yuan Yuan Cui ◽  
Shuai Huang ◽  
Zhi Bin Zhang
Keyword(s):  
Drug Delivery ◽  
Molecular Weight ◽  
Chemical Structure ◽  
Solvent Polarity ◽  
Toluene Diisocyanate ◽  
Synthesis And Characterization ◽  
The Novel ◽  
Swelling Ratio ◽  
Swelling Properties

The present study describes degradable polyurethane (PU) microspheres fabricated using toluene diisocyanate, polycaprolactone, polyethylene glycol, 2, 2-hydroxymethyl-2-propionic acid and triethylamine for drug delivery. The novel microspheres were synthesized using self-emulsion and condensed phase separation method. Fourier-Transform Infrared Spectrum analysis (FTIR) was performed revealing the chemical structure of polyurethane microspheres with special chains changing. Swelling properties influenced by solvent polarity, PEG content, PEG molecular weight, were evaluated, suggesting that the swelling ratio (SR) of PU microspheres increased with the increase in solvent polarity, PEG content and PEG molecular weight respectively.

Synthesis and Characterization of Well-Defined 12,12-Ammonium Ionenes: Evaluating Mechanical Properties as a Function of Molecular Weight

2008 ◽  
Vol 41 (14) ◽  
pp. 5216-5222 ◽  
Author(s):  
Sharlene R. Williams ◽  
Erika M. Borgerding ◽  
John M. Layman ◽  
Wenqin Wang ◽  
Karen I. Winey ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Synthesis And Characterization

Synthesis and characterization of semiaromatic polyamides with dicyclohexane units

RSC Advances ◽  
2016 ◽  
Vol 6 (80) ◽  
pp. 76490-76497 ◽  
Author(s):  
Guang-ming Yan ◽  
Gang Zhang ◽  
Hao-hao Ren ◽  
Yan Li ◽  
Jie Yang
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Synthesis And Characterization

The resultant semiaromatic polyamides showed excellent mechanical properties, superior thermal properties and good processability.

Synthesis and characterization of an extractive-based bio-epoxy resin from beetle infested Pinus contorta bark

2014 ◽  
Vol 16 (7) ◽  
pp. 3483-3493 ◽  
Author(s):  
Pei-Yu Kuo ◽  
Mohini Sain ◽  
Ning Yan
Keyword(s):  
Molecular Weight ◽  
Thermal Properties ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Pinus Contorta ◽  
Tree Bark ◽  
Synthesis And Characterization ◽  
Low Molecular Weight ◽  
Mechanical And Thermal Properties

The cured bio-epoxy resins synthesized from low molecular weight tree bark extractives displayed good mechanical and thermal properties.

scholarly journals Synthesis and Characterization of Lignin-Based Polyurethane as a Potential Compatibilizer

2018 ◽  
Vol 18 (3) ◽  
pp. 390 ◽  
Author(s):  
Salma Ilmiati ◽  
Jana Hafiza ◽  
Jaka Fajar Fatriansyah ◽  
Elvi Kustiyah ◽  
Mochamad Chalid
Keyword(s):  
Molecular Weight ◽  
Surface Tension ◽  
Thermal Properties ◽  
Polyethylene Glycol ◽  
Thermal Degradation ◽  
Molar Mass ◽  
Sessile Drop ◽  
Synthesis And Characterization ◽  
Hyperbranched Structure

Lignin is one of the most abundant biopolymer on earth. It has polar and non-polar side due to its hyperbranched structure, but the polarity of lignin has a higher tendency than non-polarity. Lignin has potential to be compatibilizer if the portion of non-polar can be increased. This research is focused on investigate the synthesis of lignin-based polyurethane to enhance the portion of non-polarity in lignin. Lignin-based polyurethane was prepared by reacting variation 4,4'-Methylenebis(cyclohexyl isocyanate) (HMDI) and polyethylene glycol (PEG), then lignin was added to the reaction. In this study, the structure of lignin-based polyurethane was confirmed by NMR and FTIR. NMR and FTIR showed that lignin successfully grafted. NMR, also used to investigate the variation molar mass of PEG and isocyanate contents effects to polarity of lignin-based polyurethane. The polarity of lignin-based polyurethane decrease as the composition of HMDI and molecular weight of PEG increase. This result also occurs on the sessile drop test that used to determine surface tension of lignin-based polyurethane. The thermal properties of lignin-based polyurethane also investigate using STA. Based on STA, enhancement of composition of HMDI and PEG increase thermal degradation and resistance of lignin-based polyurethane.

Synthesis and Characterization of a New Thermosetting Boric Acid Ester

2011 ◽  
Vol 239-242 ◽  
pp. 1907-1910
Author(s):  
Jian Zhang ◽  
Jia Liu
Keyword(s):  
Weight Loss ◽  
Thermal Properties ◽  
Thermogravimetric Analysis ◽  
Boric Acid ◽  
Acid Ester ◽  
Hydrolytic Stability ◽  
Synthesis And Characterization ◽  
Boric Acid Ester ◽  
Ft Ir

A new thermosetting boric acid ester modifier containing unsaturated bonds (abbreviated TBCE) was prepared. Structure, hydrolytic stability, curing properties and and thermal properties of the boric acid ester were studied by FT-IR, DSC and TGA. The result indicated that the obtained boric acid ester was soluble in most common solvents and was easily processed. The thermogravimetric analysis of silicon-containing arylacetylene resin modified by TBSE (abbreviated MSAR) showed that char yield at 800°C was 87% under nitrogen and 49% under air, and Td5(temperature of 5% weight loss) were 570°C and 580°C respectively.

Synthesis and characterization of photothermal antibacterial hydrogel with enhanced mechanical properties

2021 ◽  
Author(s):  
Shu bin Li ◽  
Xiao Wang ◽  
Jiang Zhu ◽  
Zhenyu Wang ◽  
Lu Wang
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Bond ◽  
Fe3o4 Nanoparticles ◽  
Intermolecular Hydrogen Bond ◽  
Amide Bond ◽  
Synthesis And Characterization

In this work, using carboxyl-modified Fe3O4 nanoparticles as a photothermal agent, combining the chemical amide bond and intermolecular hydrogen bond crosslinking force, a photothermal hydrogel with enhanced mechanical properties was...

scholarly journals Synthesis and characterization of different soybean oil-based polyols with fatty alcohol and aromatic alcohol

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 491-499
Author(s):  
Fukai Yang ◽  
Hao Yu ◽  
Yuyuan Deng ◽  
Xinyu Xu
Keyword(s):  
Molecular Weight ◽  
Soybean Oil ◽  
Retention Time ◽  
Ring Opening ◽  
Isoamyl Alcohol ◽  
Synthesis And Characterization ◽  
Intermolecular Force ◽  
H Nmr ◽  
Epoxy Groups

Abstract In this article, five kinds of soybean oil-based polyols (polyol-E, polyol-P, polyol-I, polyol-B, and polyol-M) were prepared by ring-opening the epoxy groups in epoxidized soybean oil (ESO) with ethyl alcohol, 1-pentanol, isoamyl alcohol, p-tert-butylphenol, and 4-methoxyphenol in the presence of tetrafluoroboric acid as the catalyst. The SOPs were characterized by FTIR, 1H NMR, GPC, viscosity, and hydroxyl numbers. Compared with ESO, the retention time of SOPs is shortened, indicating that the molecular weight of SOPs is increased. The structure of different monomers can significantly affect the hydroxyl numbers of SOPs. Due to the large steric hindrance of isoamyl alcohol, p-hydroxyanisole, and p-tert-butylphenol, SOPs prepared by these three monomers often undergo further dehydration to ether reactions, which consumes the hydroxyl of polyols, thus forming dimers and multimers; therefore, the hydroxyl numbers are much lower than polyol-E and polyol-P. The viscosity of polyol-E and polyol-P is much lower than that of polyol-I, polyol-B, and polyol-M. A longer distance between the molecules and the smaller intermolecular force makes the SOPs dehydrate to ether again. This generates dimer or polymers and makes the viscosity of these SOPs larger, and the molecular weight greatly increases.

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