Moisture‐sorption characteristics of starch/low‐density polyethylene films

Raj, Baldev; Raj, Anuj; Kumar, K. R.; Siddarramaiah,

doi:10.1002/app.10417

Cited by 15 publications

(10 citation statements)

References 27 publications

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“…The experimental sorption data applied to the BET model for various starch contents of the PVA/starch films, as shown in Figure 3(A), were found to fit well for a w ϭ 0.1-0.4. Chirife and Iglesias 11 and Raj et al 3 demonstrated that the BET equation was good for the aforementioned range of a w . The BET constants were determined from a linear fitting of the BET equation, 3 and the corresponding values are given in Table I.…”

Section: Sorption Model Analysismentioning

confidence: 97%

“…Chirife and Iglesias 11 and Raj et al 3 demonstrated that the BET equation was good for the aforementioned range of a w . The BET constants were determined from a linear fitting of the BET equation, 3 and the corresponding values are given in Table I. The values of M m varied from 3.08 to 7.88, indicating that different PVA/starch blends had different capacities for moisture sorption and also for the availability of free water.…”

Section: Sorption Model Analysismentioning

confidence: 97%

“…These models-BrunauerEmmet-Teller (BET), Smith, Guggenheim-Anderson-de Boer (GAB), 5 Harkins-Jura, 6 Bradley, Oswin, Halsey, Caurie, Kuhn, 7 and Henderson 8 -were used to fit the experimental sorption isotherm data of the PVA/starch films. The BET, Smith, Bradley, Oswin, Halsey, and Caurie models were reported by Raj et al 3 A rearrangement of some of the equations was performed to facilitate the determination of the appropriate coefficients with a linear fitting.…”

Section: Sorption Isotherm Modelsmentioning

confidence: 99%

“…3 The saturated solutions were placed in different desiccators so that different RHs would be obtained. The PVA/starch films were exposed to these environments according to a standard procedure reported by Labuza.…”

Section: Preparation Of the Pva/starch Blendsmentioning

confidence: 99%

“…Corn starch was employed in this study because the mechanical properties of films with corn starch were found to be better. 3 The moisture sorption characteristic of starch-filled PVA films were studied in this work. Information on sorption isotherms of PVA/ starch films is not available at present.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of moisture sorption isotherms of poly(vinyl alcohol)/starch films

Raj

Madan

et al. 2003

J of Applied Polymer Sci

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Studies on the moisture sorption characteristics of poly(vinyl alcohol)/starch blends for water activity (a w ) values of 0.1-0.9 were performed at 27°C. The equilibrium moisture content at different a w values was used to fit different sorption isotherm models proposed in the literature. The ranges of a w applicable for the different sorption isotherms were reported. The model constants of the sorption equations were determined by linear fitting. The value of the coefficient of determination (0.98 Ϯ 0.01) confirmed the goodness of fit of the equations studied.

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Section: Sorption Model Analysismentioning

confidence: 97%

Section: Sorption Model Analysismentioning

confidence: 97%

Section: Sorption Isotherm Modelsmentioning

confidence: 99%

Section: Preparation Of the Pva/starch Blendsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling of moisture sorption isotherms of poly(vinyl alcohol)/starch films

Raj

Madan

et al. 2003

J of Applied Polymer Sci

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Surface‐treated kaolin minerals as a complement or substitute to glass fibers in thermoplastics

Baioumy

Colton

Poulakis³

et al. 2018

Polymer Engineering & Sci

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Glass fiber (GF)‐related mold abrasion and tool wear make it undesirable for certain thermoplastics applications. Furthermore, fiber attrition during processing and orientation sensitivity raise concerns over compromised performance. In this study, kaolin minerals with varying properties and surface‐treatments are tested to potentially replace GFs in nylon composites. Composites are melt‐compounded and injection molded using lab‐scale and industrial‐scale equipment. Mechanical properties (tensile, flex, impact), heat distortion temperature, and thermal decomposition using thermogravimetric analysis (TGA) are used to comparatively characterize kaolin composite formulations against 30% weight GF composites. Kaolin minerals with high aspect ratio and good interfacial contact are found to show strength and modulus improvements up to 80% that of GF. Additionally, low aspect ratio kaolin composites were found to surpass GF composites in impact strength. A synergistic effect is found between high and low aspect ratio kaolin that can potentially lead to further enhancement in properties with the added possibility of blending minerals to customize composite performance. Such findings suggest that kaolin minerals can be used to customize the properties of composites in manners previously unattainable through GF usage alone. Scale up trials show potential for kaolin to replace GFs at industrial levels. POLYM. ENG. SCI., 59:E330–E338, 2019. © 2018 Society of Plastics Engineers

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