Crystallization， Rheological and Mechanical Properties of Poly（L-Lactic Acid）/Poly（D-Lactic Acid）/Glass Fiber Composites

doi:10.19894/j.issn.1000-0518.250080

Chinese Journal of Applied Chemistry ›› 2025, Vol. 42 ›› Issue (8): 1096-1104.DOI: 10.19894/j.issn.1000-0518.250080

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Crystallization， Rheological and Mechanical Properties of Poly（L-Lactic Acid）/Poly（D-Lactic Acid）/Glass Fiber Composites

Hai-Long SUN¹, Hao-Peng WANG¹, Hong-Da CHENG², Yi LI¹, Chang-Yu HAN²()

^1.School of Materials Science and Engineering，Jilin Jianzhu University，Changchun 130118，China
^2.State Key Laboratory of Polymer Science and Technology，Changchun Institute of Applied Chemistry，Chinese Academy of Sciences，Changchun 130022，China

Received:2025-02-27 Accepted:2025-06-16 Published:2025-08-01 Online:2025-08-11
Contact: Chang-Yu HAN
About author:cyhan@ciac.ac.cn
Supported by:
the 2024 College Students' Innovation and Entrepreneurship Training Program of Jilin Jianzhu University(S202410191049)

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Abstract

Abstract:

Poly（L-lactic acid）（PLLA）/poly（D-lactic acid）（PDLA）/glass fiber （GF） composites were prepared by melt compounding. The results showed that the SC crystallites could dramatically accelerate the crystallization rate of PLLA. The vicat softening temperature （VST） of PLLA/PDLA/GF composites couldreach 160 ℃， about 100 ℃ higher than that of neat PLLA. The introduction of GFs and PDLA enhanced rheological properties of composites. When PDLA content was increased to 5%（mass percent）， the network of SC crystallites was formed. Mechanical testing reaveled that the Young′s modulus and tensile strength of the composite with 1.6% （mass percent） GF were 28% and 93%， respectively， higher than neat PLLA. It is believed that the enhanced rheological and mechanical properties， as well as heat distortion resistance of the PLLA/PDLA/GF composites can contribute to the success of PLA composites in more biodegradable applications.

Key words: Poly（L-lactic acid）/poly（D-lactic acid）, Glass fiber, Composites, Stereocomplex

CLC Number:

O632

Hai-Long SUN, Hao-Peng WANG, Hong-Da CHENG, Yi LI, Chang-Yu HAN. Crystallization， Rheological and Mechanical Properties of Poly（L-Lactic Acid）/Poly（D-Lactic Acid）/Glass Fiber Composites[J]. Chinese Journal of Applied Chemistry, 2025, 42(8): 1096-1104.

Figures/Tables 8

Fig.1 （A） Torque as a function of time during melt blending process and （B） DSC heating flow curves of neat PLLA and PLLA/PDLA/GF composites at a heating rate of 10 ℃/min

Fig.2 SEM images of surface for （A） neat PLLA，（B） PLLA/GF，（C） PLLA-D1.6/GF，（D） PLLA-D4/GF and （E） PLLA-D8/GF

Fig.3 DSC thermograms of samples：（A） first cooling and （B） second heating at a rate of 10 ℃/min

Table 1 DSC data of neat PLLA and PLLA/PDLA/GF composites

Samples	First cooling		Second heating
Samples	T_c/℃	ΔH_c/（J·g^-1）	T_cc/℃	ΔH_c/（J·g^-1）	T_m/℃	ΔH_m，HC/（J·g^-1）	X_HC/%	ΔH_m，SC/（J·g^-1）	X_SC/%
PLLA	-	-	106.5	26.4	169.8	35.7	10.0	-	-
PLLA/GF	-	-	109.0	29.3	170.4	35.9	7.1	-	-
PLLA-D1.6/GF	111.4	33.0	-	-	165.9	38.4	41.3	1.9	2.0
PLLA-D4/GF	115.6	32.1	-	-	166.8	33.9	36.5	5.2	5.2
PLLA-D8/GF	116.1	32.5	-	-	167.2	33.0	35.5	11.8	11.1

Fig.4 Variation of （A） storage modulus （G′），（B） loss modulus （G″），（C） complex viscosity （|η*|） and （D） loss tangent （tanδ） vs. frequency for samples at 175 °C

Fig.5 The plots of G′ and G″ at 0.05 rad/s vs. PDLA content

Fig.6 Deformation-temperature curves of neat PLLA and PLLA/PDLA/GF composites with unannealed（A）， annealed treatment （B） and vicat softening temperature（VST）（C）

Fig.7 （A） Stress-strain curves，（B） elongation at break，（C） tensile strength and （D） Young′s modulus of PLLA and PLLA/PDLA/GF composites

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Crystallization， Rheological and Mechanical Properties of Poly（L-Lactic Acid）/Poly（D-Lactic Acid）/Glass Fiber Composites

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