Synthesis and Characterization of PCL/TiO2 Nanocomposites Obtained by In Situ Polymerization

2012 ◽  
Vol 182-183 ◽  
pp. 194-197
Author(s):  
Lian Liu ◽  
Yuan Liu ◽  
Teng Yu ◽  
Li Na Heng ◽  
Pei Wang
Keyword(s):  
Molecular Weight ◽  
Nanocomposite Materials ◽  
Synthesis And Characterization ◽  
The Novel ◽  
Biodegradable Poly

The novel biodegradable poly(ε-caprolactone)/TiO2nanocomposite materials were successfully prepared via in situ in the presence of modified-TiO2initiator and Sn(Oct)2 catalyst. The relationships between morphology, molecular weight, and properties were investigated by means of SEM, TGA, DSC and GPC. A tendency of the nanoparticles to form aggregates was observed, especially at higher fillers contents. The molecular weight of PCL matrix was dependent on the amount of the TiO2fillers

Synthesis and Characterization of Poly (ε-caprolactone)/ TiO2 Nanocomposites Obtained by In Situ Polymerization

2011 ◽  
Vol 328-330 ◽  
pp. 1533-1536
Author(s):  
Guang Shuo Wang ◽  
Zhi Yong Wei ◽  
Lian Liu ◽  
Pei Wang ◽  
Min Qi
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
Crystalline Structure ◽  
Synthesis And Characterization ◽  
The Novel ◽  
Biodegradable Poly ◽  
Thermal Stability Of ◽  
Nucleating Effect

The novel biodegradable poly (ε-caprolactone)/TiO2 nanocomposites were prepared by in situ polymerization of ε-caprolactone in the presence of modified-TiO2 nanoparticles as initiator. The molecular weight of poly (ε-caprolactone) (PCL) matrix was dependent on the amount of the TiO2 fillers. The incorporation of TiO2 did not significantly affect the crystalline structure of PCL. An astounding nucleating effect of TiO2 on PCL crystallization was observed. The enhanced thermal stability of PCL nanocomposites was observed. The novel biodegradable poly (ε-caprolactone)/TiO2 nanocomposites were prepared by in situ polymerization of ε-caprolactone in the presence of modified-TiO2 nanoparticles as initiator. The molecular weight of poly (ε-caprolactone) (PCL) matrix was dependent on the amount of the TiO2 fillers. The incorporation of TiO2 did not significantly affect the crystalline structure of PCL. An astounding nucleating effect of TiO2 on PCL crystallization was observed. The enhanced thermal stability of PCL nanocomposites was observed.

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.

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.

Synthesis and characterization of an in-situ Al2O3/Al–Cu composite with a heterogeneous structure

2021 ◽  
Vol 868 ◽  
pp. 159283
Author(s):  
Tong Gao ◽  
Lingyu Liu ◽  
Jinpeng Song ◽  
Guiliang Liu ◽  
Xiangfa Liu
Keyword(s):  
Synthesis And Characterization ◽  
Heterogeneous Structure
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