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. 2022 Aug 12;14(16):3298.
doi: 10.3390/polym14163298.

A Rapid Thermal Absorption Rate and High Latent Heat Enthalpy Phase Change Fiber Derived from Bio-Based Low Melting Point Copolyesters

Tsung-Yu Lan  1   2   3 , Hsu-I Mao  1 , Chin-Wen Chen  1 , Yi-Ting Lee  1 , Zhi-Yu Yang  1 , Jian-Liang Luo  1 , Pin-Rong Li  1 , Syang-Peng Rwei  1
Affiliations

A Rapid Thermal Absorption Rate and High Latent Heat Enthalpy Phase Change Fiber Derived from Bio-Based Low Melting Point Copolyesters

Tsung-Yu Lan et al. Polymers (Basel). .

Abstract

A series of poly(butylene adipate-co-hexamethylene adipate) (PBHA) copolymers with different content of 1,4-cyclohexanedimethanol (CHDM) was synthesized via one-step melt polymerization. The PBHA copolymer with 5 mol% CHDM (PBHA-C5) exhibited a low melting point (Tm) and high enthalpy of fusion (∆Hm) of 35.7 °C and 43.9 J g-1, respectively, making it a potential candidate for an ambient temperature adjustment textile phase change material (PCM). Polybutylene terephthalate (PBT) was selected as the matrix and blended at different weight ratios of PBHA-C5, and the blended samples showed comparable Tm and ∆Hm after three cycles of cooling and reheating, indicating good maintenance of their phase changing ability. Samples were then processed via melt spinning with a take-up speed of 200 m min-1 at draw ratios (DR) of 1.0 to 3.0 at 50 °C. The fiber's mechanical strength could be enhanced to 2.35 g den-1 by increasing the DR and lowering the PBHA-C5 content. Infrared thermography showed that a significant difference of more than 5 °C between PBT and other samples was achieved within 1 min of heating, indicating the ability of PBHA-C5 to adjust the temperature. After heating for 30 min, the temperatures of neat PBT, blended samples with 27, 30, and 33 wt% PBHA-C5, and neat PBHA-C5 were 53.8, 50.2, 48.3, 47.2, and 46.5 °C, respectively, and reached an equilibrium state, confirming the temperature adjustment ability of PBHA-C5 and suggesting that it can be utilized in thermoregulating applications.

Keywords: 1,4-cyclohexanedimethanol; melt spinning; phase change material; poly(butylene adipate-co-hexamethylene adipate).

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Scheme 1
Scheme 1
Synthetic route of PBHA-Cn copolymers.
Figure 1
Figure 1
1H-NMR spectrum of PBHA-Cn copolymers.
Figure 2
Figure 2
FT-IR spectra of PBHA-Cn copolymers.
Figure 3
Figure 3
DSC curve of PBHA-Cn copolymers in (a) first cooling process and (b) second reheating process at the same rate of 10 °C min−1.
Figure 4
Figure 4
Weight loss as a function of temperature for PBHA-Cn copolymers.
Figure 5
Figure 5
Tan δ of PBHA-Cn copolymers as a function of temperature.
Figure 6
Figure 6
(a) XRD patterns of PBHA-Cn copolymers, and (b) the overlap feature peak by (110) of PBA and (220) of PHA.
Figure 7
Figure 7
POM images of PBHA-Cn copolymers at a given temperature.
Figure 8
Figure 8
Apparent viscosity plots of blended samples for (a) PBHA-C5/PBT = 33/67, (b) PBHA-C5/PBT = 30/70, and (c) PBHA-C5/PBT = 27/73 under different temperatures and shear rates.
Figure 9
Figure 9
DSC curves of PBHA-Cn copolymers in three cycles of cooling and reheating: (a) PBHA-C5/PBT = 33/67, (b) PBHA-C5/PBT = 30/70, and (c) PBHA-C5/PBT = 27/73.
Figure 10
Figure 10
Tensile properties of fiber at various draw ratios: (a) PBHA-C5/PBT = 33/67, (b) PBHA-C5/PBT = 30/70, and (c) PBHA-C5/PBT = 27/73.
Figure 11
Figure 11
DSC curves of fiber samples in the first heating trace: (a) as-spun fiber, (b) fiber at draw ratio = 3.0, and (c) plots of melting enthalpy for the as-spun fiber and with draw ratio of 3.0 as a function of PBHA-C5 content.
Figure 12
Figure 12
Infrared temperature image for neat PBT, blended fiber samples with 27, 30, 33 wt% PBHA-C5, and neat PBHA-C5 for different heating times at 55 °C.
Figure 13
Figure 13
Plots of the surface temperature change in samples as a function of time.
See this image and copyright information in PMC

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