Preparation and Characterization of Poly(Lactic Acid)‐g‐Maleic Anhydride + Starch Blends

Orozco, Víctor H.; Brostow, Witold; Chonkaew, Wunpen; López, Betty L.

doi:10.1002/masy.200950309

Cited by 107 publications

(102 citation statements)

References 36 publications

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“…In the fourth stage, between 280°C and 365°C, the mass loss is attributed to the decomposition of corn starch (20,21,28,29). It can be seen that relatively large exothermic peak at 310°C in the DTA curve (Fig.…”

Section: Resultsmentioning

confidence: 99%

Thermal Stability Investigation and the Kinetic Study of Folnak® Degradation Process Under Nonisothermal Conditions

Jankovi

2010

AAPS PharmSciTech

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Abstract. The nonisothermal degradation process of Folnak ® drug samples was investigated by simultaneous thermogravimetric and differential thermal analysis in the temperature range from an ambient one up to 810°C. It was established that the degradation proceeds through the five degradation stages (designated as I, II, III, IV, and V), which include: the dehydration (I), the melting process of excipients (II), as well as the decomposition of folic acid (III), corn starch (IV), and saccharose (V), respectively. It was established that the presented excipients show a different behavior from that of the pure materials. During degradation, all excipients increase their thermal stability, and some kind of solidsolid and/or solid-gas interaction occurs. The kinetic parameters and reaction mechanism for the folic acid decomposition were established using different calculation procedures. It was concluded that the folic acid decomposition mechanism cannot be explained by the simple reaction order (ROn) model (n= 1) but with the complex reaction mechanism which includes the higher reaction orders (RO, n>1), with average value of =1.91. The isothermal predictions of the third (III) degradation stage of Folnak ® sample, at four different temperatures (T iso =180°C, 200°C, 220°C, and 260°C), were established. It was concluded that the shapes of the isothermal conversion curves at lower temperatures (180-200°C) were similar, whereas became more complex with further temperature increase due to the pterin and p-amino benzoic acid decomposition behavior, which brings the additional complexity in the overall folic acid decomposition process.

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Section: Resultsmentioning

confidence: 99%

Thermal Stability Investigation and the Kinetic Study of Folnak® Degradation Process Under Nonisothermal Conditions

Jankovi

2010

AAPS PharmSciTech

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“…4, the peak observed at 3338 cm -1 was referred to the vibration stretching of inter-and intra-molecular bonds between the starch and glycerol hydroxyl groups (Orozco et al 2009;Yuan et al 2009). The peak at 2945 cm -1 was imputed to belong to the C-H stretching band from the TPS backbone (Han 2005;Orozco et al 2009). The stretching of the C=O bonds came from the backbone of the PLA found at a frequency of 1754 cm -1 (Orozco et al 2009).…”

Section: Ftir Spectroscopic Analysismentioning

confidence: 99%

“…The peak at 2945 cm -1 was imputed to belong to the C-H stretching band from the TPS backbone (Han 2005;Orozco et al 2009). The stretching of the C=O bonds came from the backbone of the PLA found at a frequency of 1754 cm -1 (Orozco et al 2009). The C-OH group peak, found at a frequency of 1043 cm -1 , was believed derive from the TPS hydroxyl substituent (Han 2005).…”

Section: Ftir Spectroscopic Analysismentioning

confidence: 99%

Physical and Degradation Properties of Polylactic Acid and Thermoplastic Starch Blends – Effect of Citric Acid Treatment on Starch Structures

Ibrahim¹,

Wahab²,

Uylan³

et al. 2017

BioResources

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The physical and degradation properties of polylactic (PLA)/thermoplastic starch (TPS) blends after TPS modification with citric acid (CA) were investigated. The interfacial adhesion between the PLA and TPS was expected to improve, thus enhancing the physical properties of the PLA/TPS blends. The tensile strength and Young's modulus for PLA/TPS blends at (60/40) and (40/60) blends ratio were found to increase after modification with CA. On the other hand, the elongation at break of the (60/40) blend decreased, while elongation at break of the (40/60) blend increased. Meanwhile, an additional peak at 1721 cm -1 was detected by the FTIR spectroscopic analysis, which indicated that the TPS had chemically interacted with the CA. The biodegradability properties of PLA/TPS blends were also improved after treatment with CA. The deterioration of PLA/TPS blends was attributed to the incorporation of CA; O2 from the soil was attracted to the PLA/TPS blends, thus speeding up the degradation process of the blends.

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“…5. The T g of thermoplastic starch (TPS) was reported to be between −8 and 50 • C, however, it was seldom detected by DSC or DMTA (Lourdin, Bizot, & Colonna, 1997;Orozco, Brostow, Chonkaew, & Lopez, 2009;Wan, Sun, & Seib, 2002;Wang, Yu, & Ma, 2007;Wang, Yu, & Ma, 2008). The T g of PHB in the blends keeps constant with MA content.…”

Section: Morphology Of the Phb/eva/starch Blends In The Presence Of Mamentioning

confidence: 99%

Structure–property relationships of reactively compatibilized PHB/EVA/starch blends

Piming

Chen

et al. 2014

Carbohydrate Polymers

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a b s t r a c tA method is addressed to prepare poly(hydroxybutyrate)/poly(ethylene-co-vinyl acetate)/starch (PHB/EVA/starch) blends with fine dispersion of starch, i.e. by an in situ compatibilization in the presence of maleic anhydride (MA) and peroxide. The starch particle size is reduced from hundreds-m to sub-m after the compatibilization accompanied by an improvement in interfacial adhesion. Meanwhile, starch-in-EVA-type morphology is observed in the blends. The EVA and starch gradually changed into a (partially) co-continuous phase with increasing MA content. Consequently, toughness of the blends was improved as evidenced by an increase in elongation at break and tensile-fracture energy (work). Cavitation, fibrillation and matrix yielding are regarded as the toughening mechanism for the compatibilized blends. In addition, the T g of the EVA phase is dependent on its phase morphology in the blends while the thermal behavior of the PHB was only slightly affected by the compatibilization.

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Preparation and Characterization of Poly(Lactic Acid)‐g‐Maleic Anhydride + Starch Blends

Cited by 107 publications

References 36 publications

Thermal Stability Investigation and the Kinetic Study of Folnak® Degradation Process Under Nonisothermal Conditions

Thermal Stability Investigation and the Kinetic Study of Folnak® Degradation Process Under Nonisothermal Conditions

Physical and Degradation Properties of Polylactic Acid and Thermoplastic Starch Blends – Effect of Citric Acid Treatment on Starch Structures

Structure–property relationships of reactively compatibilized PHB/EVA/starch blends

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