Starch- polyvinyl alcohol crosslinked film— performance and biodegradation

SbstractThe aim of the work was to study the mechanical properties of extruded starch/polyvinyl alcohol (PVA)/glycerol biodegradable blends using multivariate analysis. The blends were produced as cylindrical strands by extrusion using PVAs with different hydrolysis degrees and viscosities, at two extrusion temperature profiles (90/170/170/170/170 °C and 90/170/200/200/200 °C) and three conditioning relative humidities of the samples (33, 53, and 75%). The mechanical properties showed a great variability according to PVA type, as well as the extrusion temperature profile and the conditioning relative humidity; the tensile strength ranged from 0.42 to 5.40 MPa, elongation at break ranged from 10 to 404% and Young's modulus ranged from 0.93 to 13.81 MPa. The multivariate analysis was a useful methodology to study the mechanical properties behavior of starch/PVA/glycerol blends, and it can be used as an exploratory technique to select of the more suitable PVA type and extrusion temperature to produce biodegradable materials.

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“…The water acts as plasticizer, consequently materials conditioned at high RH absorb more water, decreasing their mechanical properties [11,12] .…”

Section: Resultsmentioning

confidence: 99%

Biodegradable blends of starch/polyvinyl alcohol/glycerol: multivariate analysis of the mechanical properties

et al. 2016

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“…Similarly, Park et al [Park et al, 1994] showed that the rate of degradation of a mixture injected/molded starch and poly(vinyl alcohol) in the presence of activated sludge (25°C) was similar to that of easily degradable materials like starch alone or cellulose. Chen et al [Chen et al, 1997] also confirm the positive effect of the incorporation of starch on the biodegradation of poly (vinyl alcohol) in soil at 24°C, the biodegradation of the mixture being more important than that of poly (vinyl alcohol) alone. However, when the polymer coupled with starch is not degradable, Wool et al [Wool et al, 1990] and Gilmore et al [Gilmore et al, 1992] showed that the material was only bio-fragmented.…”

Section: Mineralization In Liquid and Solid Mediamentioning

confidence: 82%

Properties and Biodegradation Nature of Thermoplastic Starch

Saiah¹,

Gattin²,

Sreekumar³

2012

Thermoplastic Elastomers

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“…Many products based on different technology have been developed and reported, including starch-PVOH based films in the presence of a plasticizer e.g. glycerol (Mori et al, 1998, Mao et al, 2000, Fishman et al, 2006, Chen et al, 1997, extruded foams containing up to 10% of PVOH and baked starch-PVOH foams (Chiellini et al, 2003.…”

Section: Polyvinyl Alcoholmentioning

confidence: 99%

Life Cycle Assessment (LCA) of Light-Weight Eco-composites

Guo¹

2012

Springer Theses

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LCA of Light-weight Eco-composites Statement of originality 2 Statement of originalityI hereby declare that this submission is my own work and to the best of my knowledge it contains no materials previously published or written by another person.Contributions made to the research of this thesis by others, with whom I have worked with are explicitly acknowledged. I also declare that the intellectual content of this thesis is the product of my own work, except to the extent that assistance from others with data collection and modification of process-oriented model DNDC is acknowledged. Miao GuoSep 2010 LCA of Light-weight Eco-compositesAbstract 3 AbstractThe environmental profiles of novel wheat based foam materials were investigated in this thesis using Life Cycle Assessment (LCA) methods. The LCAs were developed using primary data collected from industrial sources combined with new laboratory experiments supplemented with secondary data from publicly available sources.Laboratory research was conducted to obtain important missing data on WBFs for the LCA modelling, including physico-chemical parameters, biodegradability and energy recovery under anaerobic digestion conditions.Contribution analysis suggested that the emissions evolved from the wheat agroecosystem and PVOH production, together with the energy and infrastructure involved in WBF production were the major contributors to the environmental burdens of the WBF life cycle in most impact categories. The atmospheric emissions resulting from WBF degradation at the end-of-life also emerged as another important contributor to environmental impact. Amongst the diverse ‗end-of-life' scenarios examined, AD and home composting were suggested to be the optimum choices for WBF waste treatment. This research discusses two N 2 O modelling approaches and presents a method to expand the system boundary by integrating the process-oriented model DNDC for field emissions into the LCA. Sensitivity analysis suggests that the environmental profiles of agricultural products are influenced substantially by the system boundary definition. LCA of Light-weight Eco-compositesAbstract 4 Furthermore, it suggests that the ‗general rule' in LCA practice by applying an empirical model or a default emission factor (EF) could deliver unreliable LCA findings.This study also evaluated the sensitivity of the LCA results to methodology and data variations and quantified the uncertainties in the LCA outcomes arising from uncertainty in the inventory and data variability. This has led to an increase in confidence in the LCA findings. At the same time it indicates the areas where improvements in data or methods are needed in order for robust conclusions to be drawn and unbiased information to be delivered e.g. the methodological rigidity of characterization models, the IPCC Tier 1 EF uncertainty range. LCA of Light-weight Eco-compositesAcknowledgements 5

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Starch- polyvinyl alcohol crosslinked film— performance and biodegradation

Cited by 104 publications

References 4 publications

Biodegradable blends of starch/polyvinyl alcohol/glycerol: multivariate analysis of the mechanical properties

Biodegradable blends of starch/polyvinyl alcohol/glycerol: multivariate analysis of the mechanical properties

Properties and Biodegradation Nature of Thermoplastic Starch

Life Cycle Assessment (LCA) of Light-Weight Eco-composites

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