Insertion-Crystallization-Induced Low-Temperature Annealing Peaks in Melt-Crystallized Poly(l-Lactic Acid)

被引：18

作者：

Androsch, Rene ^{[1
]}

Toda, Akihiko ^{[2
]}

Furushima, Yoshitomo ^{[3
]}

Schick, Christoph ^{[4
,5
,6
]}

机构：

[1] Martin Luther Univ Halle Wittenberg, Interdisciplinary Ctr Transfer Oriented Res Nat S, D-06099 Halle, Germany

[2] Hiroshima Univ, Grad Sch Adv Sci & Engn, Hiroshima 7398521, Japan

[3] Toray Res Ctr Ltd, Mat Characterizat Labs, 3-7,Sonoyama 3 Chome, Otsu, Shiga 5208567, Japan

[4] Univ Rostock, Inst Phys, D-18051 Rostock, Germany

[5] Univ Rostock, Competence Ctr CALOR, D-18051 Rostock, Germany

[6] Kazan Fed Univ, Butlerov Inst Chem, 18 Kremlyovskaya St, Kazan 420008, Russia

来源：

MACROMOLECULAR CHEMISTRY AND PHYSICS | 2021年 / 222卷 / 18期

关键词：

annealing peaks; crystallization; heat capacity; poly(l-lactic acid); RIGID AMORPHOUS FRACTION; EXTENDED-CHAIN CRYSTALS; GLASS-TRANSITION; SECONDARY CRYSTALLIZATION; TOPOLOGICAL CONSTRAINTS; ISOTACTIC POLYPROPYLENE; POLY(LACTIC ACID); THERMAL-BEHAVIOR; UNIFIED THEORY; HEAT-CAPACITY;

D O I：

10.1002/macp.202100177

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Annealing of poly(l-lactic acid) (PLLA) at temperatures lower than the temperature of primary melt-crystallization leads to appearance of distinct low-temperature annealing peaks in subsequently recorded calorimeter heating scans. Reason is continuation of crystallization by growth of crystals of lower stability as formed during primary crystallization. The assignment of low-temperature annealing peaks to crystallization is based on a robust analysis of the decrease of the heat capacity of the semicrystalline structure slightly above the glass transition temperature and its correlation with the corresponding enthalpy of crystallization. Comparison of the form of annealing peaks with classical enthalpy-recovery peaks obtained on devitrification of the glassy amorphous phase of semicrystalline PLLA supports the interpretation regarding the origin of annealing peaks.

引用

页数：8

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