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Time resolved study of oriented crystallisation of poly(lactic acid) during rapid tensile deformation

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Title: Time resolved study of oriented crystallisation of poly(lactic acid) during rapid tensile deformation
Authors: Mahendrasingam, A.1 a.mahendrasingam@keele.ac.uk, Blundell, D.J.1, Parton, M.1, Wright, A.K.1, Rasburn, J.2, Narayanan, T.3, Fuller, W.1
Source: Polymer. Jul2005, Vol. 46 Issue 16, p6009-6015. 7p.
Subjects: Lactic acid, Monomers, Amorphous substances, Crystals, Crystallization
Abstract: Abstract: Poly(l-lactic acid) with 4% d-lactic acid comonomer has been drawn in the amorphous state at 80, 90, 100, 110 and 120°C at an extension rate of 4s−1 while simultaneously recording WAXS and SAXS patterns at intervals of 0.12s. At 80, 90 and 100°C, crystallisation is very rapid (1–4s−1) and follows a first order transformation process to give highly oriented crystals. SAXS patterns were barely detectable at these temperatures despite fractional crystallinity of ∼0.2. At 110 and 120°C, crystallisation was very slow (∼0.01s−1) and gave rise to crystals with a lower degree of orientation. After eventual crystallisation at 120°C, a two-point SAXS pattern develops with narrow lateral spread, suggesting ‘shish kebab’ morphology. When the 80°C drawn sample was annealed at 120°C, a strong four point SAXS pattern develops. The change in drawing and crystallisation behaviour at higher draw temperature is attributed to the onset of chain retraction relaxation processes. The WAXS fibre pattern after annealing shows sampling on intermediate layer lines that is consistent with the α crystal form with a 103 helix. However, prior to annealing, sampling indicates a different, less defined helical configuration. [Copyright &y& Elsevier]
Copyright of Polymer is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 18132611
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Time resolved study of oriented crystallisation of poly(lactic acid) during rapid tensile deformation
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  Data: <searchLink fieldCode="AR" term="%22Mahendrasingam%2C+A%2E%22">Mahendrasingam, A.</searchLink><relatesTo>1</relatesTo><i> a.mahendrasingam@keele.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Blundell%2C+D%2EJ%2E%22">Blundell, D.J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Parton%2C+M%2E%22">Parton, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wright%2C+A%2EK%2E%22">Wright, A.K.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Rasburn%2C+J%2E%22">Rasburn, J.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Narayanan%2C+T%2E%22">Narayanan, T.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Fuller%2C+W%2E%22">Fuller, W.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Polymer%22">Polymer</searchLink>. Jul2005, Vol. 46 Issue 16, p6009-6015. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Lactic+acid%22">Lactic acid</searchLink><br /><searchLink fieldCode="DE" term="%22Monomers%22">Monomers</searchLink><br /><searchLink fieldCode="DE" term="%22Amorphous+substances%22">Amorphous substances</searchLink><br /><searchLink fieldCode="DE" term="%22Crystals%22">Crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Crystallization%22">Crystallization</searchLink>
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  Data: Abstract: Poly(l-lactic acid) with 4% d-lactic acid comonomer has been drawn in the amorphous state at 80, 90, 100, 110 and 120°C at an extension rate of 4s−1 while simultaneously recording WAXS and SAXS patterns at intervals of 0.12s. At 80, 90 and 100°C, crystallisation is very rapid (1–4s−1) and follows a first order transformation process to give highly oriented crystals. SAXS patterns were barely detectable at these temperatures despite fractional crystallinity of ∼0.2. At 110 and 120°C, crystallisation was very slow (∼0.01s−1) and gave rise to crystals with a lower degree of orientation. After eventual crystallisation at 120°C, a two-point SAXS pattern develops with narrow lateral spread, suggesting ‘shish kebab’ morphology. When the 80°C drawn sample was annealed at 120°C, a strong four point SAXS pattern develops. The change in drawing and crystallisation behaviour at higher draw temperature is attributed to the onset of chain retraction relaxation processes. The WAXS fibre pattern after annealing shows sampling on intermediate layer lines that is consistent with the α crystal form with a 103 helix. However, prior to annealing, sampling indicates a different, less defined helical configuration. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Polymer is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.polymer.2005.05.081
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        Type: general
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