Phonons and heat capacity of polyoxymethylene

Srivastava, Shweta; Srivastava, Seema; Srivastava, Saurabh; La'Verne, Sanjeev John; Khan, Irfan; Ali, Parvez; Gupta, V. D.

doi:10.1002/app.34050

Cited by 5 publications

(3 citation statements)

References 42 publications

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“…It is a lightweight, low-friction, and wear-resistant thermoplastic with good physical and processing properties and capable of operating at temperatures in excess of 90˚C [6]. The POM blends have been less studied, for example, Wang [7] studied the thermal stability of POM and Its blends with poly(ethylene-methylacrylate) (EMA) or poly (styrene-butadiene-styrene) (SBS).…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Morphological Properties of Polypropylene/Polyoxymethylene Blends

Wacharawichanant¹,

Siripattanasak²

2013

ACES

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This work studies the mechanical and morphological properties of polypropylene (PP)/polyoxymethylene (POM) blends. The PP/POM blends were prepared by melting-blend with an internal mixer. The contents of PP were used at 10%, 20%, 30%, 70%, 80% and 90% by weight. The phase morphology of the blends was observed by scanning electron microscope (SEM) due to the mechanical properties depended on the phase morphology. The results show the decrease of the impact strength, Young's modulus and tensile strength of POM/PP blends with increasing of PP content up to 30 wt% and then increase again with a high PP content. The percent strain at break of the blends increases after adding PP in a range of 70 -90 wt%. SEM study reveals that the POM/PP blends clearly demonstrate a two-phase matrix-particle microstructure. The results also show that the domain size of dispersed PP or POM phase increases with increasing PP or POM content. The POM domain size is smaller than the PP domain size which leads to a little change of mechanical results of PP.

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Section: Introductionmentioning

confidence: 99%

Mechanical and Morphological Properties of Polypropylene/Polyoxymethylene Blends

Wacharawichanant¹,

Siripattanasak²

2013

ACES

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“…High crystallinity induces very good mechanical properties such as high modulus, stiffness, hardness, fatigue resistance and creep resistance [5,6]. Other desirable technological properties of POM include dimensional stability, corrosion resistance, superior tribological properties and capability of operating at temperatures above 90°C [7][8][9]. All of these properties combined with good moldability allow the use of POM as a structural material in many different applications.…”

Section: Lepkooeae I Podatnooeae Na Pe³zanie Kopolimerów Polioksymetymentioning

confidence: 99%

Viscosity and creep compliance of polyoxymethylene copolymers of various average molecular weights

et al. 2015

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The effect of average molecular weight (M w) of polyoxymethylene (POM) on melt viscosity and solid state creep compliance were investigated. Viscosity follows the power function of M w. Creep compliance results indicate that time-temperature superposition applies to POM copolymers. Creep compliance in a short time (0.25 s) is independent of M w , but in a longer time (10 years) it follows an inverse power law relation with M w , up to a critical value of M w = 81 100, where creep compliance becomes independent of M w. At intermediate time (17 min), similar to short one, no effect on susceptibility to creep compliance was observed. It was also stated that the activation energy is independent of M w .

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“…Because of the development of new polymerization techniques, the latter part of the century witnessed monomers and initiators, a revolution in the field of synthetic polymers. In this series, a new and extremely interesting field, polymer‐ylide chemistry is of recent origin,10–14 i.e., synthesis of polymers initiated by ylides. Ylides are 1,2 dipolar compounds in which a positively charged heteroatom is connected to a carbanion.…”

Section: Introductionmentioning

confidence: 99%

Understanding social obstacles to early breast cancer detection is critical to improving breast cancer outcome in low‐ and middle‐resource countries

Anderson

2010

Cancer

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In most low-and middle-resource countries (LMCs), breast cancer incidence rates are increasing more rapidly than in regions where incidence rates already are high. Despite the younger age structure of most developing countries, LMCs already account for 45% of the incident breast cancer cases and cause 54% of the annual breast cancer deaths around the globe. 1 Even assuming (conservatively) that there will be no change in underlying age-specific rates, a nearly 50% increase is anticipated in breast cancer global incidence and mortality between the years 2002 and 2020 caused simply by the aging of current global populations. These rising cancer rates will be disproportionately greater among countries in the developing world, and the rates in LMCs are projected to reach a 55% increased incidence and a 58% increased mortality in <20 years. 1 In reality, these projected statistics probably underestimate future cancer rates, because the few data available from LMCs reveal increasing age-specific breast cancer incidence and mortality rates, especially among recent birth cohorts. This is especially true for urban women in LMCs and is attributable in part to the adoption of Western lifestyles. 2,3 Improvements in breast cancer survival in the industrialized world that have been observed in recent decades can be attributed to early detection by screening combined with timely and effective treatment as guided by the results of extensive and rigorously performed clinical trials. 4 Randomized trials of screening mammography combined with clinical breast examination (CBE) initiated in the 1970s demonstrated that early cancer detection within a given population leads to down-staging of disease and improvement in breast cancer survival. At the same time, randomized trials of systemic therapies for breast cancer proved that endocrine therapy for estrogen receptor (ER)-positive cancers and cytotoxic chemotherapy for ER-negative cancers improve survival and produce durable long-term cure among patients with lymph node negative, lymph node positive, and even locally advanced breast cancers. 5 Breast cancer mortality essentially was unchanged in the United States for 6 decades between 1930 and 1990. By contrast, since 1990, age-adjusted breast cancer mortality has been dropping by nearly 2% each year in the United States, indicating that true progress is being made in the management of this disease. 6 Similar improvements also are being observed in Western European countries that have invoked population-wide early detection and adjuvant treatment programs.Notably, minority women in the United States are more likely to present with advanced stage disease and have higher mortality rates than white women, although white women and black women who present with similar stage disease and receive similar treatment have similar outcomes. These findings suggest that differences in stage at presentation should represent a primary target for research, the goal of which is to determine which interventions best reduce disparities in cancer outcom...

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Phonons and heat capacity of polyoxymethylene

Cited by 5 publications

References 42 publications

Mechanical and Morphological Properties of Polypropylene/Polyoxymethylene Blends

Mechanical and Morphological Properties of Polypropylene/Polyoxymethylene Blends

Viscosity and creep compliance of polyoxymethylene copolymers of various average molecular weights

Understanding social obstacles to early breast cancer detection is critical to improving breast cancer outcome in low‐ and middle‐resource countries

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