Memory effect of locally ordered α-phase in the melting and phase transformation behavior of β-isotactic polypropylene

Kilwon Cho; D. Nabi Saheb; Hoichang Yang; Byoung Il Kang; Joonkyung Kim; Sang Soo Lee

doi:10.1016/S0032-3861(03)00305-7

Memory effect of locally ordered α-phase in the melting and phase transformation behavior of β-isotactic polypropylene

Kilwon Cho, D. Nabi Saheb, Hoichang Yang, Byoung Il Kang, Joonkyung Kim, Sang Soo Lee

Research output: Contribution to journal › Article › peer-review

82 Citations (Scopus)

Abstract

Structural changes in β-isotactic polypropylene (β-iPP) during the heating were studied by means of differential scanning calorimetry and real-time in situ X-ray diffraction using a synchrotron source. Crystalline phase transformation and the memory effect caused by residual nuclei of α-iPP were observed during the heating of β-iPP. The memory effect observed in β-iPP during heating and crystallization is believed to be due to the existence of locally ordered α-from in the melt. The effect of local α-form order was probed by studying the behavior under heating of samples with a range of thermal histories. Samples were heated above the equilibrium melting temperature of iPP to remove all residual local order and the memory effect associated with this local order. The samples crystallized isothermally at different temperatures exhibited a significantly different melting and phase transformation behavior during heating. β-iPP is found to be an excellent material for the study of polymorphism, phase transformations, and characteristic memory effects in semicrystalline polymers.

Original language	English
Pages (from-to)	4053-4059
Number of pages	7
Journal	Polymer
Volume	44
Issue number	14
DOIs	https://doi.org/10.1016/S0032-3861(03)00305-7
Publication status	Published - 2003 Jun 13

Bibliographical note

Funding Information:
The authors would like to thank the Ministry of Science and Technology of Korea (National Research Laboratory Project), Ministry of Education of Korea (BK21 Program), and the Pohang Accelerator Laboratory for providing the 4C1 beam line used for this study.

Keywords

Memory effect
Phase transformation
β-Isotactic polypropylene

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1016/S0032-3861(03)00305-7

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title = "Memory effect of locally ordered α-phase in the melting and phase transformation behavior of β-isotactic polypropylene",

abstract = "Structural changes in β-isotactic polypropylene (β-iPP) during the heating were studied by means of differential scanning calorimetry and real-time in situ X-ray diffraction using a synchrotron source. Crystalline phase transformation and the memory effect caused by residual nuclei of α-iPP were observed during the heating of β-iPP. The memory effect observed in β-iPP during heating and crystallization is believed to be due to the existence of locally ordered α-from in the melt. The effect of local α-form order was probed by studying the behavior under heating of samples with a range of thermal histories. Samples were heated above the equilibrium melting temperature of iPP to remove all residual local order and the memory effect associated with this local order. The samples crystallized isothermally at different temperatures exhibited a significantly different melting and phase transformation behavior during heating. β-iPP is found to be an excellent material for the study of polymorphism, phase transformations, and characteristic memory effects in semicrystalline polymers.",

keywords = "Memory effect, Phase transformation, β-Isotactic polypropylene",

author = "Kilwon Cho and Saheb, {D. Nabi} and Hoichang Yang and Kang, {Byoung Il} and Joonkyung Kim and Lee, {Sang Soo}",

note = "Funding Information: The authors would like to thank the Ministry of Science and Technology of Korea (National Research Laboratory Project), Ministry of Education of Korea (BK21 Program), and the Pohang Accelerator Laboratory for providing the 4C1 beam line used for this study.",

year = "2003",

month = jun,

day = "13",

doi = "10.1016/S0032-3861(03)00305-7",

language = "English",

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T1 - Memory effect of locally ordered α-phase in the melting and phase transformation behavior of β-isotactic polypropylene

AU - Cho, Kilwon

AU - Saheb, D. Nabi

AU - Yang, Hoichang

AU - Kang, Byoung Il

AU - Kim, Joonkyung

AU - Lee, Sang Soo

N1 - Funding Information: The authors would like to thank the Ministry of Science and Technology of Korea (National Research Laboratory Project), Ministry of Education of Korea (BK21 Program), and the Pohang Accelerator Laboratory for providing the 4C1 beam line used for this study.

PY - 2003/6/13

Y1 - 2003/6/13

N2 - Structural changes in β-isotactic polypropylene (β-iPP) during the heating were studied by means of differential scanning calorimetry and real-time in situ X-ray diffraction using a synchrotron source. Crystalline phase transformation and the memory effect caused by residual nuclei of α-iPP were observed during the heating of β-iPP. The memory effect observed in β-iPP during heating and crystallization is believed to be due to the existence of locally ordered α-from in the melt. The effect of local α-form order was probed by studying the behavior under heating of samples with a range of thermal histories. Samples were heated above the equilibrium melting temperature of iPP to remove all residual local order and the memory effect associated with this local order. The samples crystallized isothermally at different temperatures exhibited a significantly different melting and phase transformation behavior during heating. β-iPP is found to be an excellent material for the study of polymorphism, phase transformations, and characteristic memory effects in semicrystalline polymers.

AB - Structural changes in β-isotactic polypropylene (β-iPP) during the heating were studied by means of differential scanning calorimetry and real-time in situ X-ray diffraction using a synchrotron source. Crystalline phase transformation and the memory effect caused by residual nuclei of α-iPP were observed during the heating of β-iPP. The memory effect observed in β-iPP during heating and crystallization is believed to be due to the existence of locally ordered α-from in the melt. The effect of local α-form order was probed by studying the behavior under heating of samples with a range of thermal histories. Samples were heated above the equilibrium melting temperature of iPP to remove all residual local order and the memory effect associated with this local order. The samples crystallized isothermally at different temperatures exhibited a significantly different melting and phase transformation behavior during heating. β-iPP is found to be an excellent material for the study of polymorphism, phase transformations, and characteristic memory effects in semicrystalline polymers.

KW - Memory effect

KW - Phase transformation

KW - β-Isotactic polypropylene

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DO - 10.1016/S0032-3861(03)00305-7

M3 - Article

AN - SCOPUS:0037497351

SN - 0032-3861

VL - 44

SP - 4053

EP - 4059

JO - Polymer

JF - Polymer

IS - 14

ER -

Memory effect of locally ordered α-phase in the melting and phase transformation behavior of β-isotactic polypropylene

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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