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المؤلفون: Jean-Sébastien Roy, Karen McCreesh, Jeremy Lewis, Marc-Olivier Dubé, Eva Barrett, Frédérique Dupuis
المساهمون: Ireland Canada University Foundation
المصدر: BMJ Open Sport — Exercise Medicine
مصطلحات موضوعية: medicine.medical_specialty, shoulder, medicine.medical_treatment, Psychological intervention, Physical Therapy, Sports Therapy and Rehabilitation, Cryotherapy, Context (language use), law.invention, rehabilitation, 03 medical and health sciences, 0302 clinical medicine, Randomized controlled trial, law, medicine, Orthopedics and Sports Medicine, Rotator cuff, Brief Pain Inventory, 030222 orthopedics, education, Rehabilitation, exercise, business.industry, 030229 sport sciences, rotator cuff, medicine.anatomical_structure, shoulder disorders, Physical therapy, Original Article, business, Range of motion, cryotherapy
الوصف: ObjectivesRotator cuff tendinopathies are the most common shoulder disorders. As persistent symptoms lasting more than 3 months have been shown to be a strong indicator of poor outcomes, it is important to have successful interventions in the acute stage. However, there is no evidence yet to guide clinical interventions in an acute pain context. The objective of this study was to compare the short-term effect of a 2-week gradual reloading exercises programme with the use of cryotherapy on symptoms and function for acute rotator cuff tendinopathy.MethodsThis simple-blind, randomised controlled trial included 44 participants with acute rotator cuff tendinopathy who were randomly allocated to either the exercises or cryotherapy group. Symptoms and functional limitations were evaluated at weeks 0, 2 and 6 using self-reported questionnaires (Disabilities of the Arm, Shoulder and Hand, Western Ontario Rotator Cuff, and Brief Pain Inventory), while acromiohumeral distance, shoulder strength and active range of motion were evaluated at weeks 0 and 2.ResultsFollowing interventions, both groups showed statistically significant improvements on symptoms and function at week 2 and week 6 compared with baseline. However, there was no significant group × time interaction. There was no time effect on acromiohumeral distance, shoulder strength and active range of motion, as well as no time × group interaction.ConclusionThe results showed a statistically significant improvement in symptoms and function in both groups, but there was no difference between the short-term effect of a cryotherapy based-approach and a gradual reloading exercises programme.Trial registration numberNCT02813304.
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6cc6604b04a50e25a3a1397bbf326031
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المؤلفون: Marc A. Dubé, Samaneh Khanlari
المصدر: Journal of Macromolecular Science, Part A. 52:587-592
مصطلحات موضوعية: Materials science, Polymers and Plastics, Bulk polymerization, Inorganic chemistry, Cationic polymerization, Solution polymerization, General Chemistry, chemistry.chemical_compound, End-group, Chain-growth polymerization, Polymerization, chemistry, Materials Chemistry, Ceramics and Composites, Precipitation polymerization, Acrylic acid
الوصف: The free-radical redox-initiated aqueous solution polymerization of fully and partially neutralized acrylic acid was carried out at room temperature under full exposure to air. The effect of neutralization degree on the polymerization rate and product properties was studied. Increasing neutralization of the reaction mixture with sodium hydroxide resulted in greater conversion of acrylic acid to sodium acrylate. The rate of polymerization, determined from a gravimetric off-line water removal technique, was shown to decrease significantly with decreasing degree of neutralization. Molecular weight also decreased with decreasing degree of neutralization. The glass transition temperature and hydrophilicity of the polymer product decreased with increasing degree of neutralization. In-line infrared monitoring was also used to monitor the reaction progress and was shown to be an effective tool for this purpose.
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المؤلفون: Samaneh Khanlari, Marc A. Dubé
المصدر: Industrial & Engineering Chemistry Research. 54:5598-5603
مصطلحات موضوعية: In situ, chemistry.chemical_classification, Materials science, Nanocomposite, Infrared, General Chemical Engineering, Analytical chemistry, 02 engineering and technology, General Chemistry, Polymer, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Industrial and Manufacturing Engineering, 0104 chemical sciences, chemistry.chemical_compound, symbols.namesake, Monomer, Fourier transform, stomatognathic system, chemistry, Attenuated total reflection, symbols, Gravimetric analysis, 0210 nano-technology
الوصف: The in situ formation of poly(sodium acrylate)-based nanocomposites was monitored in-line using an attenuated total reflectance/Fourier transform infrared (ATR-FTIR) spectroscopic probe. Results were compared with conversion measurements using an off-line gravimetric method. A multivariate statistical data treatment based on the online data for the nanocomposite containing 0.5 wt % of nanosilver was used to calibrate the ATR-FTIR spectroscopic probe. The ATR-FTIR method was shown to be reliable based on 95% confidence intervals for monitoring the production of polymers synthesized in the presence of different amounts of nanosilver over the full range of monomer conversion.
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المؤلفون: Shanshan Ren, Marc A. Dubé, Esther Trevino
المصدر: Macromolecular Reaction Engineering. 9:339-349
مصطلحات موضوعية: Allylic rearrangement, Acrylate, Polymers and Plastics, Chemistry, General Chemical Engineering, Chain transfer, General Chemistry, Benzoyl peroxide, chemistry.chemical_compound, Polymerization, Polymer chemistry, medicine, Copolymer, Reactivity (chemistry), Glass transition, medicine.drug
الوصف: The bulk free radical copolymerization of d-limonene (Lim) with n-butyl acrylate (BA) was carried out at 80 °C using benzoyl peroxide as initiator. Low conversion experiments were run to estimate the copolymer reactivity ratios as rBA = 6.07 and rLim = 0.0067. High conversion experiments were then conducted to validate the reactivity ratios for prediction of cumulative copolymer composition. The presence of allylic hydrogen in d-limonene caused a notable degradative chain transfer reaction which greatly impeded polymerization. Increasing d-limonene fractions in the copolymer resulted in a decrease in final conversion and molecular weight, and an increase in glass transition temperature.
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المؤلفون: Samaneh Khanlari, Marc A. Dubé
المصدر: Polymer Engineering & Science. 55:1230-1236
مصطلحات موضوعية: chemistry.chemical_classification, Aqueous solution, Materials science, Nanocomposite, Polymers and Plastics, Solution polymerization, 02 engineering and technology, General Chemistry, Polymer, engineering.material, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, Chemical engineering, chemistry, Polymerization, Polymer chemistry, Materials Chemistry, engineering, Biopolymer, In situ polymerization, 0210 nano-technology, Acrylic acid
الوصف: Polymer-based nanocomposites have been widely investigated as a potential method to modify polymer and biopolymer properties. Poly(sodium acrylate) (PNaA)/nanosilver nanocomposites with 0.5, 1, 2, and 3 wt% nanofiller were prepared by in situ polymerization. The free radical, redox-initiated, aqueous solution polymerization of NaOH-neutralized acrylic acid was conducted in the presence of nanosilver. The progress of the polymerization was monitored using gravimetric conversion measurements. The addition of 0.5 wt% nanosilver to the polymerization resulted in a significant decrease in rate of polymerization The effect on rate was noticeably reduced when the experiment was repeated with nanoclay, a nonmetallic nanofiller, in lieu of nanosilver. POLYM. ENG. SCI., 55:1230–1236, 2015. © 2015 Society of Plastics Engineers
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المؤلفون: Marc A. Dubé, Yujie Zhang
المصدر: Polymer-Plastics Technology and Engineering. 54:499-505
مصطلحات موضوعية: Acrylate, D limonene, Materials science, Polymers and Plastics, General Chemical Engineering, Materials Science (miscellaneous), Chain transfer, Benzoyl peroxide, chemistry.chemical_compound, Polymerization, chemistry, Polymer chemistry, Materials Chemistry, medicine, Copolymer, Reactivity (chemistry), 2-ethylhexyl acrylate, medicine.drug
الوصف: The bulk free radical copolymerization of D-limonene and 2-ethylhexyl acrylate (EHA) was conducted at 80°C using benzoyl peroxide (BPO) as initiator. Low conversion experiments were conducted to estimate the copolymer reactivity ratios. The reactivity ratios r1 = 6.896 and r2 = 0.032 (1 = EHA, 2 = d-limonene) were obtained using a non-linear, error-in-variables method with the RREVM computer program. High conversion experiments were performed and revealed that a degradative chain transfer mechanism for D-limonene dominated the polymerization.
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المؤلفون: Yujie Zhang, Marc A. Dubé
المصدر: Macromolecular Reaction Engineering. 8:805-812
مصطلحات موضوعية: Limonene, Polymers and Plastics, Chemistry, General Chemical Engineering, Radical polymerization, Chain transfer, General Chemistry, Benzoyl peroxide, Methacrylate, chemistry.chemical_compound, Monomer, Polymer chemistry, medicine, Copolymer, Reactivity (chemistry), medicine.drug
الوصف: The bulk free radical copolymerization of n-butyl methacrylate (BMA) and D-limonene is carried out at 80 °C using benzoyl peroxide (BPO) as initiator. Low conversion experiments are conducted to estimate the copolymer reactivity ratios while full conversion runs are performed to verify the estimates and to achieve high monomer conversions. Reactivity ratios of r1 = 6.0957 and r2 = 0.0459 (1 = BMA, 2 = D-limonene) are obtained using a nonlinear, error-in-variables method with the RREVM computer program. Full conversions and reasonably high molecular weights are achieved at high BMA feed concentrations. Achieving high conversion is limited by a degradative chain transfer mechanism due to the D-limonene.
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المؤلفون: Marc A. Dubé, Yujie Zhang
المصدر: Polymer Reaction Engineering of Dispersed Systems ISBN: 9783319734781
مصطلحات موضوعية: Green chemistry, chemistry.chemical_classification, Waste management, business.industry, Emulsion polymerization, 02 engineering and technology, Polymer, Raw material, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Renewable energy, chemistry, Scientific method, Sustainability, Environmental science, 0210 nano-technology, business, Efficient energy use
الوصف: The polymer industry is dominated by the use of petroleum-based feedstock and, as a result of increased awareness, the related environmental consequences have provided the impetus for change. Emulsion polymerization is considered to be a more sustainable technique for the manufacture of polymeric materials because of its use of water as a dispersing medium. To further improve the sustainability of emulsion polymerization technology, the “12 principles of green chemistry and engineering” were used as a guideline for design of a greener process. The most obvious and effective approach is to use renewable, biobased feedstock in emulsion polymerization formulations. In addition, maximizing energy efficiency, preventing waste and pollution, and minimizing the potential for accidents also figure prominently.
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::a48f83f4652e621e8cc72c622d074903
https://doi.org/10.1007/12_2017_8 -
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المصدر: Macromolecular Theory and Simulations. 23:429-441
مصطلحات موضوعية: chemistry.chemical_classification, Materials science, Polymers and Plastics, Organic Chemistry, Kinetics, Polymer, Condensed Matter Physics, Inorganic Chemistry, chemistry.chemical_compound, Monomer, chemistry, Polymerization, Polymer chemistry, Materials Chemistry, Copolymer, Molecule, Methyl acrylate, Ethylene glycol
الوصف: A mathematical model for the kinetics of copolymerization with crosslinking of vinyl/divinyl monomers in the presence of ARGET ATRP controllers is developed. A reaction scheme considering multifunctional polymer molecules, which results in a tridimensional problem, is proposed. Molecular weight development during the pre-gelation period is calculated using the method of moments. Flory-Stockmayer's theory is used for the post-gelation period. The ATRP solution copolymerization of methyl acrylate (MA) and ethylene glycol diacrylate (EGDA) is used as a case study and test of the model. Good agreement between predicted profiles and experimental data from the literature is obtained.
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المصدر: Macromolecular Theory and Simulations. 23:147-169
مصطلحات موضوعية: chemistry.chemical_classification, Materials science, Polymers and Plastics, Organic Chemistry, Kinetics, Raft, Polymer, Condensed Matter Physics, Network formation, Inorganic Chemistry, chemistry.chemical_compound, Monomer, chemistry, Fragmentation (mass spectrometry), Computational chemistry, Polymer chemistry, Materials Chemistry, Copolymer, Molecule
الوصف: A mathematical model for the kinetics of copolymerization with crosslinking of vinyl/divinyl monomers in the presence of RAFT controllers is developed. A reaction scheme considering multifunctional polymer molecules, which results in a multidimensional problem, is proposed. Molecular weight development during the pre-gelation period was calculated using the method of moments. Flory–Stockmayer's theory is used for the post-gelation period. The case of RAFT homopolymerization is also studied, as an example of model reduction, with identical results as those obtained with an existing model based on a simplifying premise. Good agreement between predicted profiles, our own experimental data, and data from other groups is obtained in most of the analyzed cases despite the occasional use of certain simplifying assumptions.
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