scholarly journals Effect of Poly(Titanium Oxide) on the Viscoelastic and Thermophysical Properties of Interpenetrating Polymer Networks

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 794
Author(s):  
Tamara Tsebriienko ◽  
Anatoli I. Popov
Keyword(s):  
Differential Scanning Calorimetry ◽  
Titanium Oxide ◽  
Thermophysical Properties ◽  
Sol Gel ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Oxide Content ◽  
Hydroxyethyl Methacrylate ◽  
Inorganic Component ◽  
Scanning Calorimetry

The influence of poly(titanium oxide) obtained using the sol-gel method in 2-hydroxyethyl methacrylate medium on the viscoelastic and thermophysical properties of interpenetrating polymer networks (IPNs) based on cross-linked polyurethane (PU) and poly(hydroxyethyl methacrylate) (PHEMA) was studied. It was found that both the initial (IPNs) and organo-inorganic interpenetrating polymer networks (OI IPNs) have a two-phase structure by using methods of dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC). The differential scanning calorimetry methods and scanning electron microscopy (SEM) showed that the presence of poly(titanium oxide) increases the compatibility of the components of IPNs. It was found that an increase in poly(titanium oxide) content leads to a decrease in the intensity of the relaxation maximum for PHEMA phase and an increase in the effective crosslinking density due to the partial grafting of the inorganic component to acrylate. It was shown that the topology of poly(titanium oxide) structure has a significant effect on the relaxation behavior of OI IPNs samples. According to SEM, a uniform distribution of the inorganic component in the polymer matrix is observed without significant aggregation.

Damping Property of Polyurethane/Poly(methylmethacrylate-butylmethacrylate-2-Hydroxyethyl methacrylate) Interpenetrating Polymer Networks

2012 ◽  
Vol 430-432 ◽  
pp. 297-300
Author(s):  
Guo Jing Song ◽  
Mei Ju Liu ◽  
Jin Yi ◽  
Yong Gang Xu
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Loss Factor ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Hydroxyethyl Methacrylate ◽  
Damping Properties ◽  
Scanning Calorimetry ◽  
Glass Transition Temperatures ◽  
Tan Δ

Polyurethane/poly (methylacrylate-butylmethacrylate-2-Hydroxyethylmethacrylate) Interpenetrating polymernetworks (IPNs) were prepared by sequential polymerization. Their glass transition performance was measured by using differential scanning calorimetry (DSC). DSC results revealed there are three glass transition temperatures (Tg) for both IPNs samples. Their damping properties were evaluated according to ASTM E756-05. Their loss factor (tan δ>0.3) from 10-1300Hz displays a wide temperature range of 94°C.

scholarly journals Temperature- and pH-sensitive hydrogels of sequential Ti-containing interpenetrating polymer networks

2021 ◽  
pp. 42-49
Author(s):  
Т.Т. Аlekseeva ◽  
◽  
N.V. Iarova ◽  
Keyword(s):  
Molecular Weight ◽  
Water Content ◽  
Average Molecular Weight ◽  
Polymer Networks ◽  
Bound Water ◽  
Free Water ◽  
Interpenetrating Polymer Networks ◽  
Hydroxyethyl Methacrylate ◽  
Scanning Calorimetry ◽  
Polymer Component

Hydrogels of sequential Ti-containing interpenetrating polymer networks based on hydrophilic cross-linked polyurethanes with different molecular weight of polyethylene glycols and Ti-containing copolymer were synthesized based on 2-hydroxyethyl methacrylate and titanium isopropoxide. The composition of sequential interpenetrating polymer networks was determined by the degree of equilibrium swelling of the polyurethane networks in 2-hydroxyethyl methacrylate and Ti-containing comonomer. It was established that the content of the second component of the interpenetrating polymer networks increases with increasing the average molecular weight value of the polyurethane network. It was shown that the obtained highly sensitive hydrogels of Ti-containing interpenetrating polymer networks react to the changes in the temperature and pH. These factors significantly change the equilibrium water content in the hydrogels. Differential scanning calorimetry allowed determining the phase transitions that are characteristic of bound and free water, which is a part of the hydrogel of polyurethanes, interpenetrating polymer networks and Ti-containing interpenetrating polymer networks. The results showed that the content of bound water and the degree of its binding to the components of the interpenetrating polymer networks depend on the chemical structure of the network, the nature of a second polymer component (which is a part of the interpenetrating polymer networks), the polarity and hydrophilicity of macromolecules, and the size of hydrogel cells. Regardless of the nature of the second polymer component, there is a general trend for all interpenetrating polymer networks: the total water content increases with increasing the average molecular weight of the polyurethane matrix networks.

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