Temperature dependence of viscosity of polyurethane polyol solutions: Application of rheological models

Haseebuddin, Syed; Raju, K. Mohana; Krishna, D. R.; Reddy, P. J.; Yaseen, Mohammed

doi:10.1002/(sici)1097-4628(19960103)59:1<29::aid-app5>3.3.co;2-5

Cited by 3 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the contrary, a lot of discussion is based on the assumption of a constant viscosity at T g . For low‐MW polymers, the viscosity at T g was assumed to be 10 12 – 10 13 P in several literature studies 33, 42, 62–64. For biomaterials also it was assumed to be around 10 11 – 10 12 P 65–67…”

Section: Resultsmentioning

confidence: 99%

Deoxycitidine kinase is associated with prolonged survival after adjuvant gemcitabine for resected pancreatic adenocarcinoma

Maréchal

Mackey

Lai

et al. 2010

Cancer

View full text Add to dashboard Cite

BACKGROUND: Gemcitabine (2 0 ,2 0 -difluorodeoxycytidine) administration after resection of pancreatic cancer improves both disease-free survival (DFS) and overall survival (OS). Deoxycytidine kinase (dCK) mediates the ratelimiting catabolic step in the activation of gemcitabine. The authors of this report studied patient outcomes according to the expression of dCK after a postoperative gemcitabine-based chemoradiation regimen. METHODS: Fortyfive patients with resected pancreatic adenocarcinoma received adjuvant gemcitabine based-therapy in the context of multicenter phase 2 studies. Their tumors were evaluated retrospectively for dCK protein expression by immunohistochemistry. A composite score based on the percentage of dCK-positive cancer cells and the intensity of staining was generated, and the results were dichotomized at the median values. RESULTS: The median follow-up was 19.95 months (95% confident interval [CI], 3.3-107.4 months). The lymph node (LN) ratio and dCK protein expression were significant predictors of DFS and OS in univariate analysis. On multivariate analysis, dCK protein expression was the only independent prognostic variable (DFS: hazard ratio [HR], 3.48; 95% CI, 1.66-7.31; P ¼ .001; OS: HR, 3.2; 95% CI,1.44-7.13; P ¼ .004). CONCLUSIONS: dCK protein expression was identified as an independent and strong prognostic factor in patients with resected pancreatic adenocarcinoma who received adjuvant gemcitabine therapy. The authors concluded that it deserves prospective evaluation as a predictive biomarker for patient selection. Cancer 2010;116:5200-6.

show abstract

Section: Resultsmentioning

confidence: 99%

Deoxycitidine kinase is associated with prolonged survival after adjuvant gemcitabine for resected pancreatic adenocarcinoma

Maréchal

Mackey

Lai

et al. 2010

Cancer

View full text Add to dashboard Cite

show abstract

“…Thermal degradation of thermoplastic PU takes place above 200 °C [86]. Reduction of the viscosity of PU at higher temperatures [107, 108] facilitates the dispersion of CMF in the PU matrix. The treated CMF were added to the PU component of the composite and the mixture was magnetically stirred at 360 rpm speed and 150 °C temperature for 3 min.…”

Section: Methodsmentioning

confidence: 99%

“…2. Heat generation efficiency of the composite-coated specimens were characterized through performing active IRT [107] at a temperature below the freezing temperature of water. To this end, all the specimens were preconditioned at -20 °C and 30% relative humidity for at least 3 h so they could achieve thermal equilibrium [108].…”

Section: Methodsmentioning

confidence: 99%

Polyurethane-carbon microfiber composite coating for electrical heating of concrete pavement surfaces

Sassani

Arabzadeh

Ceylan

et al. 2019

Heliyon

View full text Add to dashboard Cite

Electrically-heated pavements have attracted attention as alternatives to the traditional ice/snow removal practices. Electrically conductive polymer-carbon composite coatings provide promising properties for this application. Based on the concept of joule heating, the conductive composite can be utilized as a resistor that generates heat by electric current and increases the surface temperature to melt the ice and snow on the pavement surface. This research investigates the feasibility of applying an electrically conductive composite coating made with a Polyurethane (PU) binder and micrometer-scale carbon fiber (CMF) filler as the electrical heating materials on the surface of Portland cement concrete (PCC) pavements. PU-CMF composite coatings were prepared using different volume fractions of CMF, applied on the PCC surfaces, and evaluated in terms of volume conductivity, resistive heating ability, durability, and surface friction properties at the proof-of-concept level. A conceptual cost analysis was performed to compare this method with other heated pavement systems with respect to economic viability. Percolative behavior of CMF in PU matrix was captured and most desirable CMF dosage rates in terms of each performance parameter were investigated. Two percolation transition zones were identified for CMF in PU matrix at dosage rate ranges of 0.25–1% and 4–10%. The composites exhibited their most desirable performance and properties at CMF dosage rates greater than 10% and smaller than 15%.

show abstract

“…The existence of the phase segregation caused by the clustering of hard and soft segments into separate domains has been a subject of continued research interest 1–3. Variety of polyols and diisocyanates have been used in the synthesis of PUs, and their effect on the properties have been investigated 4–8. Recently, the utilization of the renewable resources in polymers has become an increasing interest because of their potential for substitution of petrochemical derivatives.…”

Section: Introductionmentioning

confidence: 99%

Structure–property relationship of starch‐filled chain‐extended polyurethanes

Swamy¹,

Siddaramaiah

2003

J of Applied Polymer Sci

View full text Add to dashboard Cite

Chain-extended polyurethane (PU) elastomers were prepared using castor oil with 4,4Ј-methylene bis (phenyl isocyanate) (MDI) as a crosslinker and 4,4Јdiamino diphenyl sulphone (DDS) as an aromatic diamine chain extender. A series of starch-filled (from 5 to 25% wt/wt) diamines chain-extended PUs have been prepared. The starch-filled PU composites were characterized for physico-mechanical properties viz, density, surface hardness, tensile strength, and percentage elongation at break. Thermal stability of PU/starch have been carried out by using thermogravimetric analyzer (TGA). Thermal degrada-tion process of PU/starch were found to proceed in three steps. TGA thermograms of PU/starch shows that all systems were stable upto 235°C, and maximum weight loss occur at temperature 558°C. The microcrystalline parameters such as crystal size (͗N͘) and lattice strain (g in %) of PU/starch have been established using wide-angle X-ray scattering (WAXS) method.

show abstract

Temperature dependence of viscosity of polyurethane polyol solutions: Application of rheological models

Cited by 3 publications

References 0 publications

Deoxycitidine kinase is associated with prolonged survival after adjuvant gemcitabine for resected pancreatic adenocarcinoma

Deoxycitidine kinase is associated with prolonged survival after adjuvant gemcitabine for resected pancreatic adenocarcinoma

Polyurethane-carbon microfiber composite coating for electrical heating of concrete pavement surfaces

Structure–property relationship of starch‐filled chain‐extended polyurethanes

Contact Info

Product

Resources

About