Preparation and Properties of Hydrophilic PET Blends

doi:10.19491/j.issn.1001-9278.2020.08.005

Abstract

Abstract:

In this study, PETblends were prepared by a melt blending method, and their hydrophilic, thermal and mechanical properties were investigated by contact angle meter, DSC and electronic universal material testing machine, etc. The results indicated that the hydrophilic properties of the blends were improved by incorporating hydrophilic reagents like PEG, PAAS and PVP. However, there was little influence from hydrophilic reagents on the mechanical properties of the PET blends. The PET/PEG blends presented the greatest hydrophilicity among these hydrophilic reagents, and the hydrophilicity of PET/PEG blends increased gradually with an increase of PEG content. However, the hydrophilicity of the blends kept stable when the PEG content exceeded 5 wt%. Moreover, the crystallinity of PET increased at first and then tended to decrease with an increase of PEG.

Key words: poly(ethylene terephthalate), poly(ethylene glycol), hydrophilic property, blend

CLC Number:

TQ323.4⁺1

Weina CAO, Yahao ZHAO, Mengjie ZHOU, Jingwen ZHAI, Xiang YU. Preparation and Properties of Hydrophilic PET Blends[J]. China Plastics, 2020, 34(8): 30-35.

Figures/Tables 13

样品名称	PET含量	PEG含量	PAAS含量	PVP含量
PET	100	—	—	—
PET/PAAS	97	—	3	—
PET/PVP	97	—	—	3
PET/PEG 1 %	99	1	—	—
PET/PEG 3 %	97	3	—	—
PET/PEG 5 %	95	5	—	—
PET/PEG 9 %	91	9	—	—

Tab.1. Mass ratio of hydrophilic PET blends

Fig.1. Effect of different hydrophilic reagents on water contact angles of PET blends

Fig.2. Water contact angles of PET/PEG blends with different PEG content

Fig.3. DSC heating curves of PET blends with different hydrophilic reagents

3 %的亲水性试剂	熔点/℃	结晶度/%
PET	253.44	37.74
PEG	253.38	44.98
PAAS	255.08	44.69
PVP	251.88	41.87

Tab.2. Effect of different hydrophilic reagents on melting points and crystallinity of PET blends

Fig.4. DSC cooling curve of PET blends with different hydrophilic reagents

Fig.5. DSC heating curves of PET/PEG blends with different PEG content

PEG含量/%	熔点/℃	熔融焓/J·g^-1
0	253.44	37.79
1	253.42	38.79
3	253.38	44.98
5	253.26	51.19
9	253.06	41.27

Tab.3. Effects of different PEG content on melting points and crystallinity of PET/PEG blends

Fig.6. DSC cooling curves of PET/PEG blends with different PEG content

Fig.7. XRD curves of PET blends with different hydrophilic reagents

Fig.8. SEM of PET blends with different hydrophilic reagents

Fig.9. Stress?strain curves of PET blends with different hydrophilic reagents

Fig.10. Mechanical properties of PET blends with different hydrophilic reagents

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