NMR imaging and differential scanning calorimetry study on drying of pine, birch, and reed pulps and their mixtures

Sari Heikkinen, Leila Alvila (Corresponding Author), Tuula T. Pakkanen, Terhi Saari, Pekka Pakarinen

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

Drying, water fractions, and water distribution were investigated for pine, birch, and reed pulps and pine–birch, pine–reed, and pine–birch–reed pulp mixtures. Gravimetrically determined drying times showed that the drying rates of the pulps decreased at two to four inflection points. Characterizations of the dried pulps by differential scanning calorimetry (DSC) showed a faster removal of free water than freezing and nonfreezing bound waters; all decreased simultaneously, however. DSC also revealed the critical water contents at which the free water and freezing bound water disappeared. The gravimetrically determined inflection points of the drying curves corresponded with the critical points determined by DSC. NMR line widths and images produced by 1H‐NMR imaging revealed the nature and regions of the pulp drying. The constant growth rate of the NMR line widths with decreasing water content appeared to change at two inflection points, which fell approximately in the same water content regions as the inflection points of the drying curves.
Original languageEnglish
Pages (from-to)937-945
JournalJournal of Applied Polymer Science
Volume100
Issue number2
DOIs
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed

Fingerprint

Pulp
Differential scanning calorimetry
Drying
Water
Water content
Freezing
Linewidth
Nuclear magnetic resonance
Magnetic Resonance Imaging
Imaging techniques

Keywords

  • differential scanning calorimetry
  • NMR
  • NMR imaging
  • pulp drying

Cite this

Heikkinen, Sari ; Alvila, Leila ; Pakkanen, Tuula T. ; Saari, Terhi ; Pakarinen, Pekka. / NMR imaging and differential scanning calorimetry study on drying of pine, birch, and reed pulps and their mixtures. In: Journal of Applied Polymer Science. 2006 ; Vol. 100, No. 2. pp. 937-945.
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abstract = "Drying, water fractions, and water distribution were investigated for pine, birch, and reed pulps and pine–birch, pine–reed, and pine–birch–reed pulp mixtures. Gravimetrically determined drying times showed that the drying rates of the pulps decreased at two to four inflection points. Characterizations of the dried pulps by differential scanning calorimetry (DSC) showed a faster removal of free water than freezing and nonfreezing bound waters; all decreased simultaneously, however. DSC also revealed the critical water contents at which the free water and freezing bound water disappeared. The gravimetrically determined inflection points of the drying curves corresponded with the critical points determined by DSC. NMR line widths and images produced by 1H‐NMR imaging revealed the nature and regions of the pulp drying. The constant growth rate of the NMR line widths with decreasing water content appeared to change at two inflection points, which fell approximately in the same water content regions as the inflection points of the drying curves.",
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author = "Sari Heikkinen and Leila Alvila and Pakkanen, {Tuula T.} and Terhi Saari and Pekka Pakarinen",
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NMR imaging and differential scanning calorimetry study on drying of pine, birch, and reed pulps and their mixtures. / Heikkinen, Sari; Alvila, Leila (Corresponding Author); Pakkanen, Tuula T.; Saari, Terhi; Pakarinen, Pekka.

In: Journal of Applied Polymer Science, Vol. 100, No. 2, 2006, p. 937-945.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - NMR imaging and differential scanning calorimetry study on drying of pine, birch, and reed pulps and their mixtures

AU - Heikkinen, Sari

AU - Alvila, Leila

AU - Pakkanen, Tuula T.

AU - Saari, Terhi

AU - Pakarinen, Pekka

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N2 - Drying, water fractions, and water distribution were investigated for pine, birch, and reed pulps and pine–birch, pine–reed, and pine–birch–reed pulp mixtures. Gravimetrically determined drying times showed that the drying rates of the pulps decreased at two to four inflection points. Characterizations of the dried pulps by differential scanning calorimetry (DSC) showed a faster removal of free water than freezing and nonfreezing bound waters; all decreased simultaneously, however. DSC also revealed the critical water contents at which the free water and freezing bound water disappeared. The gravimetrically determined inflection points of the drying curves corresponded with the critical points determined by DSC. NMR line widths and images produced by 1H‐NMR imaging revealed the nature and regions of the pulp drying. The constant growth rate of the NMR line widths with decreasing water content appeared to change at two inflection points, which fell approximately in the same water content regions as the inflection points of the drying curves.

AB - Drying, water fractions, and water distribution were investigated for pine, birch, and reed pulps and pine–birch, pine–reed, and pine–birch–reed pulp mixtures. Gravimetrically determined drying times showed that the drying rates of the pulps decreased at two to four inflection points. Characterizations of the dried pulps by differential scanning calorimetry (DSC) showed a faster removal of free water than freezing and nonfreezing bound waters; all decreased simultaneously, however. DSC also revealed the critical water contents at which the free water and freezing bound water disappeared. The gravimetrically determined inflection points of the drying curves corresponded with the critical points determined by DSC. NMR line widths and images produced by 1H‐NMR imaging revealed the nature and regions of the pulp drying. The constant growth rate of the NMR line widths with decreasing water content appeared to change at two inflection points, which fell approximately in the same water content regions as the inflection points of the drying curves.

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