Effects of calcium salts on thermal characteristics of hydroxypropyl methylcellulose films

Sakata, Yukoh; Yamaguchi, Hiroyuki

doi:10.1016/j.jnoncrysol.2010.12.031

Cited by 13 publications

(6 citation statements)

References 26 publications

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“…3460 cm −1in the other samples suggests the weakening of the hydrogen bond interaction network (Banks, Sammon, Melia, & Timmins, 2005), provided that the former has a higher occurrence of hydroxyl groups. This is supported by the broader band presented by the less substituted grade, i.e., HPMC Methocel ® K4M (Sakata & Yamaguchi, 2011).…”

Section: Molecular Weight and Rheological Aspectsmentioning

confidence: 72%

“…Absorptions related to the axial deformation of CeOeC bonds, typical in cellulose ethers, may be observed from 900 to 1300 cm −1 (Anuar, Wui, Ghodgaonkar, & Taib, 2007;Zaccaron, Oliveira, Guiotoku, Pires, & Soldi, 2005). Bands at wavenumbers ranging from 1250 to 1460 cm −1 (herein observed at 1315, 1374, 1410, and 1452 cm −1 ) are assigned to the angular deformation of CeH bonds within e(CH 2 ) n e chains (Sakata & Yamaguchi, 2011). The band close to 1645 (Zaccaron et al, 2005) and 1650 cm −1 (Anuar et al, 2007), herein observed at 1637 cm −1 , is related with the axial deformation of carbonyl groups present in the glucose unit of cellulose.…”

Section: Molecular Weight and Rheological Aspectsmentioning

confidence: 87%

“…2 shows the FT-IR spectra of the HPMC films. All spectra presented bands close to 2900 cm −1 (at 2972, 2902, and 2836 cm −1 , more specifically) attributed to the axial deformation of the CeH bonds in aliphatic chains (Sakata & Yamaguchi, 2011), that is, to eCH 3 arising from the substitution of hydroxyl groups by methoxyl and hydroxypropyl ones. Absorptions related to the axial deformation of CeOeC bonds, typical in cellulose ethers, may be observed from 900 to 1300 cm −1 (Anuar, Wui, Ghodgaonkar, & Taib, 2007;Zaccaron, Oliveira, Guiotoku, Pires, & Soldi, 2005).…”

Section: Molecular Weight and Rheological Aspectsmentioning

confidence: 97%

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On the effects of hydroxyl substitution degree and molecular weight on mechanical and water barrier properties of hydroxypropyl methylcellulose films

Otoni

Lorevice

Moura

et al. 2018

Carbohydrate Polymers

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In line with the increasing demand for sustainable packaging materials, this contribution aimed to investigate the film-forming properties of hydroxypropyl methylcellulose (HPMC) to correlate its chemical structure with film properties. The roles played by substitution degree (SD) and molecular weight (M) on the mechanical and water barrier properties of HPMC films were elucidated. Rheological, thermal, and structural experiments supported such correlations. SD was shown to markedly affect film affinity and barrier to moisture, glass transition, resistance, and extensibility, as hydroxyl substitution lessens the occurrence of polar groups. M affected mostly the rheological and mechanical properties of HPMC-based materials. Methocel E4 M led to films featuring the greatest tensile strength (ca., 67 MPa), stiffness (ca., 1.8 GPa), and extensibility (ca., 17%) and the lowest permeability to water vapor (ca., 0.9 g mm kPa h m). These properties, which arise from its longer and less polar chains, are desirable for food packaging materials.

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Section: Molecular Weight and Rheological Aspectsmentioning

confidence: 72%

Section: Molecular Weight and Rheological Aspectsmentioning

confidence: 87%

Section: Molecular Weight and Rheological Aspectsmentioning

confidence: 97%

See 1 more Smart Citation

On the effects of hydroxyl substitution degree and molecular weight on mechanical and water barrier properties of hydroxypropyl methylcellulose films

Otoni

Lorevice

Moura

et al. 2018

Carbohydrate Polymers

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“…1,2 Other bands at 1631, 3478, 2837 and 2933 cm À1 are related to CQO stretching from the glucose of the cellulose, O-H stretching as well as stretching vibrations from C-H and methyl groups in HPMC, respectively. 28,29 Analytical grade DCPD (Fig. 2b) was used as a reference for comparison with the calcium phosphate/HPMC biocomposite particles (Fig.…”

Section: Chemical Characterization By Ir Spectroscopy and Computation...mentioning

confidence: 99%

Hydroxypropyl methylcellulose-controlled in vitro calcium phosphate biomineralization

Gashti¹,

Stir

Burgener

et al. 2022

New J. Chem.

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“…Hal ini sesuai dengan indeks kristalinitasnya, yaitu Indeks kristalinitas HPMC komersial lebih tinggi yaitu 72% dibandingkan dengan HPMC kulit koro pedang 64% (Vieira dkk., 2012). Serapan pada bilangan gelombang 1250-1460 cm -1 adalah gugus CH dan CH 2 stretching, 2850-2980 cm -1 adalah CH 3 stretching pada 1000 cm -1 adalah C-O-C dan C-O stretching alcohol absorption, pada bilangan gelombang 1648 cm -1 adalah H-O-H water absorption, dan pada bilangan gelombang 3500 cm -1 adalah ikatan hidrogen (Sakata & Yamaguchi, 2011). Hasil gugus fungsional FT-IR HPMC kulit koro pedang putih dan HPMC komersial disajikan pada Gambar 6.…”

Section: Kristalinitas Hpmcunclassified

Optimasi Sintesis Hydroxypropyl Methyl Cellulose (HPMC) dari Kulit Koro Pedang Putih (Canavalia ensiformis L. (DC)

2021

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Kulit koro pedang putih dapat digunakan sebagai sumber selulosa. Salah satu alternatif untuk meningkatkan aplikasi selulosa adalah dengan memodifikasi selulosa menjadi produk turunan selulosa yaitu Hydroxypropyl Methyl Cellulose (HPMC). Tujuan dari penelitian ini adalah melakukan optimasi terhadap sintesis dan karkaterisasi HPMC dari selulosa kulit koro pedang putih. Proses optimasi didahului dengan kajian literatur untuk menentukan kisaran titik percobaan dengan variabel terikat berupa molar subtitusi (MS) dan Derajat Subtitusi (DS). Diperoleh titik percobaan dengan variasi konsentrasi NaOH (5, 22,5, dan 40%), variasi Dimetil Sulfat (DMS) (40, 80, dan 120%), dan variasi Proilen Oksida (PO) (80, 120, dan 160%). Kemudian optimasi sintesis HPMC dilakukan dengan mengunakan Box-Behnken design (BBD) lalu dianalisis menggunakan Response Surface Methodology (RSM) Berikutnya HPMC dikarakterisasi meliputi molar subtitusi (MS), Derajat Subtitusi (DS), water holding capacity (WHC), oil holding capacity (OHC), lightness, rendemen, kristalinitas dan spektra FT-IR untuk mengetahui gugus fungsi HPMC. Hasil optimasi sintesis HPMC dari selulosa kulit koro pedang putih berdasakan RSM diperoleh titik optimum pada konsentrasi NaOH 23,11%, DMS 43,4% dan PO 81,8%. dengan karakterisasi kadar air 9,04% (wb); MS 0,15; DS 1,18; WHC 2,20 g/g; OHC 2,09 g/g; lightness 90,93; rendemen 114,78% dan kristalinitas 64%. Spektra FT-IR HPMC koro pedang putih terbaca pada bilangan gelombang 2924 cm-1 (CH dan CH2 Streching), 1373 cm-1 (CH3 Bonding), 1118 cm-1 (C-O-C), 1319 cm-1 (O-H Plane Bonding) dan 848, 68 cm-1 (C-O-C pada 1,4 β glikosidic linkage) yang merupakan ciri khas dari gugus fungsional HPMC.

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Effects of calcium salts on thermal characteristics of hydroxypropyl methylcellulose films

Cited by 13 publications

References 26 publications

On the effects of hydroxyl substitution degree and molecular weight on mechanical and water barrier properties of hydroxypropyl methylcellulose films

On the effects of hydroxyl substitution degree and molecular weight on mechanical and water barrier properties of hydroxypropyl methylcellulose films

Hydroxypropyl methylcellulose-controlled in vitro calcium phosphate biomineralization

Optimasi Sintesis Hydroxypropyl Methyl Cellulose (HPMC) dari Kulit Koro Pedang Putih (Canavalia ensiformis L. (DC)

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