Maize stalk fibre reinforced natural rubber/tyre-tread reclaimed rubber composites
- Authors: Mente, Pumza
- Date: 2017
- Subjects: Polymeric composites Rubber
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/19332 , vital:28852
- Description: This research project focuses on the production of reclaimed rubber composites reinforced with natural fibres obtained from agricultural waste. The prepared natural fibre composites were characterized through evaluation of curing characteristics, tensile properties, thermal properties, dynamic mechanical properties and electron microscopy imaging. Untreated composites generally showed poor properties which were attributed to poor compatibility and fibre agglomeration. Various treatments were then employed in attempts to improve the composite properties. Fibre treatments used were water treatment and silane treatments using two different silane coupling agents. Torque, reaction rate and tensile modulus were observed to increase with addition of reclaimed rubber and natural fibres. Tensile strength and elongation at break increased with addition of natural rubber. An increase in thermal stability was observed with addition of reclaimed rubber. Dynamic mechanical analysis (DMA) results have shown that addition of reclaimed rubber resulted to an increase in glass transition temperature. Scanning electron microscopy (SEM) images of tensile fractured composites showed evidence of fibre pull-outs from the matrix. Removal of lignin from treated natural fibres was evident from thermogravimetric analysis (TGA) for all fibre treatments. There were no noticeable improvements in composites properties with use of fibre treatments and there were no statistical differences observed among the different fibre treatments. Generally, the composites prepared showed high stiffness and low tensile strength.
- Full Text:
- Date Issued: 2017
- Authors: Mente, Pumza
- Date: 2017
- Subjects: Polymeric composites Rubber
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/19332 , vital:28852
- Description: This research project focuses on the production of reclaimed rubber composites reinforced with natural fibres obtained from agricultural waste. The prepared natural fibre composites were characterized through evaluation of curing characteristics, tensile properties, thermal properties, dynamic mechanical properties and electron microscopy imaging. Untreated composites generally showed poor properties which were attributed to poor compatibility and fibre agglomeration. Various treatments were then employed in attempts to improve the composite properties. Fibre treatments used were water treatment and silane treatments using two different silane coupling agents. Torque, reaction rate and tensile modulus were observed to increase with addition of reclaimed rubber and natural fibres. Tensile strength and elongation at break increased with addition of natural rubber. An increase in thermal stability was observed with addition of reclaimed rubber. Dynamic mechanical analysis (DMA) results have shown that addition of reclaimed rubber resulted to an increase in glass transition temperature. Scanning electron microscopy (SEM) images of tensile fractured composites showed evidence of fibre pull-outs from the matrix. Removal of lignin from treated natural fibres was evident from thermogravimetric analysis (TGA) for all fibre treatments. There were no noticeable improvements in composites properties with use of fibre treatments and there were no statistical differences observed among the different fibre treatments. Generally, the composites prepared showed high stiffness and low tensile strength.
- Full Text:
- Date Issued: 2017
South African community pharmacists’ self-perception of their professional identity and job satisfaction
- Authors: Smith, Robert Mark Houston
- Date: 2017
- Subjects: Pharmacy -- Practice -- South Africa Pharmacists -- Job satisfaction -- South Africa , Community health services -- South Africa
- Language: English
- Type: Thesis , Masters , MPharm
- Identifier: http://hdl.handle.net/10948/20637 , vital:29363
- Description: The role of the community pharmacist has changed over the past two decades. The traditional specialist roles of pharmacists, such as compounding and preparation of medications, are now infrequent activities and the profession has moved to a more patient-centred focus. Furthermore, pharmaceutical care has been developed and adopted as a practice philosophy to add value and bring care for patients back into the profession. However, there is still much debate in academic and policy literature concerning the reluctance of community pharmacists to adopt and implement pharmaceutical care in practice environments. Empirical evidence has suggested that the professional identity of pharmacists is both ambiguous and multifaceted. However, the practice of pharmaceutical care has been demonstrated to increase organisational identity of pharmacists, as well as their job satisfaction. In addition, pharmacists in a clinical role have been shown to have higher levels of job satisfaction than their counterparts in nonclinical roles. This study has identified, described and analysed the self-perceived professional identities of community pharmacists within a South African context. Furthermore, it sought to determine their current levels of job satisfaction. The relationships between professional identity, job satisfaction and role were analysed in an attempt to understand the influence of professional identity on job satisfaction and behaviour of pharmacists. This study made use of a mixed method of inquiry, online questionnaire, administered to a large sample, which allowed the researcher to take a broad view of the research foci at a specific moment in time. This study found the existence of six professional identities amongst South African Community Pharmacists; namely the practitioner, the jaded pharmacist, the social carer, the professional, the medicine supplier and the entrepreneur. South African community pharmacists were, generally, satisfied with their jobs, professed to practice pharmaceutical care and adopted it as a practice philosophy. South African Community pharmacists were, in general, committed to their profession. Correlation between a pharmacist’s professional identity and their job title, job satisfaction and their commitment were found to be statistically significant. A pharmacist’s level of job satisfaction was statistically correlated to their practice of pharmaceutical care. No statistically significant relationship was found to exist between a pharmacist’s identity and their work load or tasks performed. Characterising South African community pharmacists’ identities is of great significance in an effort to better understand the forces that drive our profession of pharmacy. In doing so, have found that identity affects many elements of work life such as job satisfaction, professional commitment and the practice of patient care.
- Full Text:
- Date Issued: 2017
- Authors: Smith, Robert Mark Houston
- Date: 2017
- Subjects: Pharmacy -- Practice -- South Africa Pharmacists -- Job satisfaction -- South Africa , Community health services -- South Africa
- Language: English
- Type: Thesis , Masters , MPharm
- Identifier: http://hdl.handle.net/10948/20637 , vital:29363
- Description: The role of the community pharmacist has changed over the past two decades. The traditional specialist roles of pharmacists, such as compounding and preparation of medications, are now infrequent activities and the profession has moved to a more patient-centred focus. Furthermore, pharmaceutical care has been developed and adopted as a practice philosophy to add value and bring care for patients back into the profession. However, there is still much debate in academic and policy literature concerning the reluctance of community pharmacists to adopt and implement pharmaceutical care in practice environments. Empirical evidence has suggested that the professional identity of pharmacists is both ambiguous and multifaceted. However, the practice of pharmaceutical care has been demonstrated to increase organisational identity of pharmacists, as well as their job satisfaction. In addition, pharmacists in a clinical role have been shown to have higher levels of job satisfaction than their counterparts in nonclinical roles. This study has identified, described and analysed the self-perceived professional identities of community pharmacists within a South African context. Furthermore, it sought to determine their current levels of job satisfaction. The relationships between professional identity, job satisfaction and role were analysed in an attempt to understand the influence of professional identity on job satisfaction and behaviour of pharmacists. This study made use of a mixed method of inquiry, online questionnaire, administered to a large sample, which allowed the researcher to take a broad view of the research foci at a specific moment in time. This study found the existence of six professional identities amongst South African Community Pharmacists; namely the practitioner, the jaded pharmacist, the social carer, the professional, the medicine supplier and the entrepreneur. South African community pharmacists were, generally, satisfied with their jobs, professed to practice pharmaceutical care and adopted it as a practice philosophy. South African Community pharmacists were, in general, committed to their profession. Correlation between a pharmacist’s professional identity and their job title, job satisfaction and their commitment were found to be statistically significant. A pharmacist’s level of job satisfaction was statistically correlated to their practice of pharmaceutical care. No statistically significant relationship was found to exist between a pharmacist’s identity and their work load or tasks performed. Characterising South African community pharmacists’ identities is of great significance in an effort to better understand the forces that drive our profession of pharmacy. In doing so, have found that identity affects many elements of work life such as job satisfaction, professional commitment and the practice of patient care.
- Full Text:
- Date Issued: 2017
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