Accessibility, reactivity and supramolecular structure of E. globulus pulps with reduced xylan content

Wollboldt, R. Petra; Zuckerstätter, Gerhard; Weber, Hedda K.; Larsson, Per Tomas; Sixta, Herbert

doi:10.1007/s00226-010-0370-2

Cited by 32 publications

(17 citation statements)

References 25 publications

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“…CEG sample showed a more prominent peak than CPT at around 1730 cm -1 while the band at 1600 cm -1 overlap with the band at 1642 cm -1 associated with adsorbed water in cellulose 19,22,23 . This may indicate that xylan is more alkali resistant and probably hemicelluloses can be precipitation on the surface of the eucalyptus cellulose fibers during kraft cooking 28,29 .…”

Section: Fourier Transform Infrared (Ftir) Spectroscopymentioning

confidence: 99%

Materials produced from plant biomass: part II: evaluation of crystallinity and degradation kinetics of cellulose

et al. 2012

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In this study Eucalyptus grandis (CEG) and Pinus taeda (CPT) cellulose fibers obtained from kraft and sulfite pulping process, respectively, were characterized using Fourier transform infrared (FTIR) spectroscopy and thermogravimetry (TGA). The degradation kinetic parameters were determined by TGA using Coats and Redfern method. FTIR results showed that CPT presented a more ordered structure with higher crystallinity than CEG. Thermogravimetric results showed that CPT had a higher thermal stability than CEG. The kinetic results revel that for CEG the degradation mechanism occurs mainly by random nucleation, although phase boundary controlled reactions also occurs while for CPT the degradation process is more related with phase boundary controlled reactions. Results demonstrated that differences between thermal stability and degradation mechanisms might be associated with differences in the cellulose crystalline structure probably caused by different pulping processes used for obtaining the cellulose fibers.

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Section: Fourier Transform Infrared (Ftir) Spectroscopymentioning

confidence: 99%

Materials produced from plant biomass: part II: evaluation of crystallinity and degradation kinetics of cellulose

et al. 2012

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“…This is in accordance with Wang et al (2008), who observed something similar: i.e., the solubility of cotton linte in cold NaOH/urea solution increased from 30% to 65% after an endoglucanase treatment, but the crystallinity of the samples remained almost unchanged. Wollboldt et al (2010) showed in a later study that the cellulose crystallinity did not affect the dissolving pulp reactivity as determined by the filterability and the particle spectrum of viscose dope. The specific surface area of cotton lint is reported to be 53 m 2 g -1 (Chunilall et al 2010).…”

Section: Properties Of Treated Pulps After Dissolution In Naoh/znomentioning

confidence: 95%

Enzyme pretreatment of dissolving pulp as a way to improve the following dissolution in NaOH/ZnO

et al. 2013

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“…Pulp rayon impor yang sebagian besar dibuat dengan proses sulfit asam akan sulit memenuhi persyaratan tersebut. Akan tetapi, pulp rayon produksi dalam negeri yang menggunak an proses prehidrolisis kraft dapat memenuhi persyaratan tersebut sehingga akan berada pada bagian residu saat analisis selulosa alfa sehingga menyebabk an kandungan selulosa alfa pulp rayon proses prehidrolisis kraft akan lebih tinggi (Strunk, Eliasson, Hagglund, & Agnemo, 2011;Wollboldt, Zuckerstätter, Weber, Larsson, & Sixta, 2010).…”

Section: Selulosa Alfaunclassified

Karakteristik Pulp Rayon Sulfit Asam Dan Prehidrolisis Kraft Komersial Berdasarkan Sni 938:2017

Purwita

Sugesty²,

Rachmanasari³

2020

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<p>Pulp rayon atau pulp larut (<em>dissolving pulp</em>) merupakan pulp dengan kandungan selulosa alfa tinggi dan kandungan komponen lain seperti lignin, abu, abu tak larut asam, kelarutan dalam alkali, dan ekstraktif rendah. Pulp rayon merupakan bahan baku untuk proses pembuatan serat rayon yang digunakan pada industri tekstil dan pakaian jadi. Penelitian ini bertujuan untuk mempelajari karakteristik pulp rayon sulfit asam dan prehidrolisis kraft komersial yang kemudian dibandingkan dengan persyaratan mutu SNI 938:2017 Pulp rayon. Pulp rayon komersial yang diperoleh dari industri pulp rayon dan industri rayon di dalam negeri maupun impor dianalisis sesuai dengan persyaratan mutu SNI 938:2017. Parameter analisisnya adalah kadar air (SNI 08-7070-2005); selulosa alfa (SNI 8400:2017 (T 203 cm-09, IDT)), kelarutan dalam alkali (SNI 692:2010), ekstraktif diklorometana (DCM) (SNI 8401:2017 (T 204 cm-07, IDT)), abu (SNI 0442:2009), abu tidak larut asam (SNI ISO 776:2010), Ca dan Fe (TAPPI T 266 om-18); viskositas (SNI 8402:2017 (T 230 om-13, IDT)); viskositas intrinsik (SNI 5351:2012); dan derajat cerah ISO (SNI 2470-1:2014). Analisis dilakukan dengan 3 ulangan dan hasil dinyatakan sebagai rata-rata. Berdasarkan percobaan, pulp rayon prehidrolisis kraft memiliki kandungan selulosa alfa yang lebih tinggi, S10 dan S18 yang lebih rendah, dan viskositas yang lebih rendah dibandingkan pulp rayon sulfit asam. Dari lima jenis pulp rayon komersial, hanya dua jenis pulp rayon komersial yang memenuhi persyaratan mutu SNI 938:2017. Kedua pulp rayon tersebut merupakan pulp rayon kayudaun proses prehidrolisis kraft.</p>

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Accessibility, reactivity and supramolecular structure of E. globulus pulps with reduced xylan content

Cited by 32 publications

References 25 publications

Materials produced from plant biomass: part II: evaluation of crystallinity and degradation kinetics of cellulose

Materials produced from plant biomass: part II: evaluation of crystallinity and degradation kinetics of cellulose

Enzyme pretreatment of dissolving pulp as a way to improve the following dissolution in NaOH/ZnO

Karakteristik Pulp Rayon Sulfit Asam Dan Prehidrolisis Kraft Komersial Berdasarkan Sni 938:2017

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