Synthesis and characterization of biodegradable poly(?-caprolactone urethane(s). I. Effects of the polyol molecular weight, catalyst, and chain extender on the molecular and physical characteristics

2002 ◽  
Vol 40 (5) ◽  
pp. 729-729 ◽  
Author(s):  
Katarzyna Gorna ◽  
Stefam Polowinski ◽  
Sylwester Gogolewski
Keyword(s):  
Molecular Weight ◽  
Chain Extender ◽  
Physical Characteristics ◽  
Synthesis And Characterization ◽  
Biodegradable Poly ◽  
Poly Caprolactone

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 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

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 Poly(Aryl Ether Quinoxaline)s with Controlled Molecular Weight

2011 ◽  
Vol 391-392 ◽  
pp. 826-829
Author(s):  
Song Ya Zhang ◽  
Zhong Xiao Li ◽  
Jia Ling Pu
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Strong Acid ◽  
Decomposition Temperature ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Aryl Ether ◽  
Good Solubility ◽  
Step Procedure

Novel poly(aryl ether quinoxaline)s (PEQs) were prepared via a two-step procedure. First, poly (ether benzil) (PEB) was synthesized by the polycondensation of 4,4’-difluorobenzil and 4,4’-isopropylidenediphenol.Then, PEB was reacted with 1,2-diaminobenzene and 4,4'-oxydibenzene-1,2-diamine to give the PEQs. The molecular weight of the PEQs could be adjusted easily by varying the molar ratio of 1,2-diaminobenzene to 4,4'-oxydibenzene-1,2-diamine. The PEQs exhibited good solubility in common organic solvents such as NMP, DMAc, DMF, cyclohexanone and chloroform. In addition, the PEQs also had high glass transition (Tg) temperatures and good thermal properties, with an initial thermal decomposition temperature above 475 oC and glass transition temperatures above 210 oC. They also exhibited excellent resistance to strong acid and alkali.

Synthesis and Characterization of Nanoscopic Entities Based on Poly(caprolactone)-Grafted Cadmium Sulfide Nanoparticles

1999 ◽  
Vol 11 (12) ◽  
pp. 3571-3577 ◽  
Author(s):  
G. Carrot ◽  
S. M. Scholz ◽  
C. J. G. Plummer ◽  
J. G. Hilborn ◽  
J. L. Hedrick
Keyword(s):  
Cadmium Sulfide ◽  
Synthesis And Characterization ◽  
Cadmium Sulfide Nanoparticles ◽  
Poly Caprolactone
Sign in / Sign up

Export Citation Format

Share Document