The melting of poly (ι-lactic acid)

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The melting of poly (ι-lactic acid). / Abdul Aziz, Azizan; Hay, James; Jenkins, Michael.

In: European Polymer Journal, Vol. 100, 03.2018, p. 253-257.

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@article{9a1e01d00a42421283d92327b50a7067,
title = "The melting of poly (ι-lactic acid)",
abstract = "The effect of crystallization temperature and time on the melting of a stereo-copolymer of l-lactic acid has been measured using differential scanning calorimetry and hot stage microscopy. The temperature of the last trace of crystallinity increased with time and temperature. Increasing the heating rate to 50 °C min−1 and correcting for thermal lag enabled the m.pt of the as-crystallized material to be determined without premature melting and recrystallization of the sample on heating. The measured melting points enabled the equilibrium m.pt. of the copolymer to be determined as 205 ± 2 °C.Changes due to lamellae thickening occurred by secondary crystallization from the initial onset of crystallization increasing with increasing temperature consistent with the process being diffusion controlled The addition of small chain segments emerging from the top lamellar surface occurred by reptation and growth increased with the square root of the lapsed time. This is consistent with the process of secondary crystallization.",
keywords = "Melting, Stem lengths, Diffusion control, Secondary crystallization",
author = "{Abdul Aziz}, Azizan and James Hay and Michael Jenkins",
year = "2018",
month = mar,
doi = "10.1016/j.eurpolymj.2018.01.041",
language = "English",
volume = "100",
pages = "253--257",
journal = "European Polymer Journal",
issn = "0014-3057",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - The melting of poly (ι-lactic acid)

AU - Abdul Aziz, Azizan

AU - Hay, James

AU - Jenkins, Michael

PY - 2018/3

Y1 - 2018/3

N2 - The effect of crystallization temperature and time on the melting of a stereo-copolymer of l-lactic acid has been measured using differential scanning calorimetry and hot stage microscopy. The temperature of the last trace of crystallinity increased with time and temperature. Increasing the heating rate to 50 °C min−1 and correcting for thermal lag enabled the m.pt of the as-crystallized material to be determined without premature melting and recrystallization of the sample on heating. The measured melting points enabled the equilibrium m.pt. of the copolymer to be determined as 205 ± 2 °C.Changes due to lamellae thickening occurred by secondary crystallization from the initial onset of crystallization increasing with increasing temperature consistent with the process being diffusion controlled The addition of small chain segments emerging from the top lamellar surface occurred by reptation and growth increased with the square root of the lapsed time. This is consistent with the process of secondary crystallization.

AB - The effect of crystallization temperature and time on the melting of a stereo-copolymer of l-lactic acid has been measured using differential scanning calorimetry and hot stage microscopy. The temperature of the last trace of crystallinity increased with time and temperature. Increasing the heating rate to 50 °C min−1 and correcting for thermal lag enabled the m.pt of the as-crystallized material to be determined without premature melting and recrystallization of the sample on heating. The measured melting points enabled the equilibrium m.pt. of the copolymer to be determined as 205 ± 2 °C.Changes due to lamellae thickening occurred by secondary crystallization from the initial onset of crystallization increasing with increasing temperature consistent with the process being diffusion controlled The addition of small chain segments emerging from the top lamellar surface occurred by reptation and growth increased with the square root of the lapsed time. This is consistent with the process of secondary crystallization.

KW - Melting

KW - Stem lengths

KW - Diffusion control

KW - Secondary crystallization

U2 - 10.1016/j.eurpolymj.2018.01.041

DO - 10.1016/j.eurpolymj.2018.01.041

M3 - Article

VL - 100

SP - 253

EP - 257

JO - European Polymer Journal

JF - European Polymer Journal

SN - 0014-3057

ER -