Studies were carried out on the kinetics of the process for producing 1,4‐cis‐polybutadiene in the presence of the catalytic system formed of monochlordiisobutylaluminum and the alcoholic complex of cobalt chloride. The experiments, carried out in homogenneous benzene solution at room temperature, pointed out the predominant role of water: when water is absent butadiene forms oligomers. Under the given conditions, the rate of polymerization of butadiene increases with the increase in the concentration of cobalt or aluminum compound and varies in a strange way when the water concentration changes. The dependence of the rate of polymerization on water concentration accounts for the difficulties in the reproductibility of experiments. The molecular weights of the polymers obtained increase linearly with the increase in water concentration and decrease with the decrease in the concentration of aluminum or cobalt compound. No dependence was noticed between the microstructure of polymers and the conditions of working.
Background: Oropharyngeal cancer is the most common type of head and neck cancers, with a 5-years survival of 64.7%. In the last 40 years risk factors and etiology changed, from the incidence associated mostly with tobacco and alcohol to HPV infection in 70% of the cases. Treatments that are standard of care for OPSCC include chemotherapy, radiotherapy or combination of surgery and radiotherapy have a high chronic treatment-related toxicity and functional loss. These therapies have significant impact on the quality of life (QOL) of survivors of oropharyngeal squamous cell carcinoma (OPSCC). Objectives: The objective of this study is to review literature on 1-year evolution of quality of life of patients treated for OPSCC with standard of care. Methods: A comprehensive search of the literature of treated OPSCC patients assessed with EORTC QLQ-30 EORTC H&N-35 at pre-treatment 12-month post treatment. Results: The first study showed that standard of care treatment produces chronic side effects, such as xerostomia, poor oral and dental health, dysphagia, feeding tube dependency in, and other fibrotic changes likely caused by radiotherapy or combination of surgery and radiotherapy. Conclusions: Standard of care treatment produces chronic side effects, such as xerostomia, poor oral and dental health, dysphagia, feeding tube dependency in, and other fibrotic changes.
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