Study on Preparation and Foaming Properties of Polystyrene/Cross⁃linked PMA Blends

doi:10.19491/j.issn.1001-9278.2020.06.008

Abstract

Abstract:

The blends of polystyrene (PS) and cross?linked poly(methyl acrylate) (PMA) were prepared by dissolving PS particles in a mixture of divinylbenzene, methyl acrylate (MA) and azobisisobutyronitrileand then initiating the polymerization of MA. The resulting blends were used to prepare a series of blend foams by an autoclave method. The structure and properties of PS/cross?linked PMA blends were characterized by a contact angle tester, differential scanning calorimeter analyzer, Fourier?transform infrared spectrometer and dynamic mechanics analyzer, and the structure of the blend foams was investigated by scanning electron microscopy. The result indicated that the introduction of cross?linked PMA improved the nucleation efficiency of the foaming system, and the contact angle of the blends decreased from 100.5 ° to 86.1 ° with an increase of MA content. The blend foams exhibited a narrow distribution in bubble size at the MA amount of 9.6 phr. Their cell size was distributed in the range of 40~60 μm, and their cell density reached 1.2×10⁸ every square centimeter.

Key words: polystyrene, methyl acrylate, blends, foaming behavior

CLC Number:

TQ328.4

Ya’e TANG, Bengang LIU. Study on Preparation and Foaming Properties of Polystyrene/Cross⁃linked PMA Blends[J]. China Plastics, 2020, 34(6): 45-51.

Figures/Tables 10

样品编号	PS用量/份	AIBN用量/份	DVB用量/份	MA用量/份
1^#	95.2	0.06	0.48	4.8
2^#	90.4	0.12	0.96	9.6
3^#	85.6	0.18	1.44	14.4
4^#	80.8	0.24	1.92	19.2
5^#	76.0	0.30	2.40	24.0

Tab. 1. Formula of the experiment

Fig. 1. FTIR of PS/crosslinked PMA blend

Fig.2. Effect of MA dosage on Tg of PS/crosslinked PMA blends

Fig.3. Effect of the MA dosage on gel content of PS/cross?linked PMA blends

Fig. 4. Crosslinking density of PS/crosslinked PMA blends

Fig.5. Contact angle of PS/crosslinked PMA blends

Fig.6. TEM for PS/crosslinked PMA blends with various MA dosage

Fig. 7. SEM for the foam of PS/crosslinked PMA blends with various MA dosage

Fig. 8. Effect of MA dosage on cell size distribution of blends

Fig.9. Cell density, cell diameter and apparent density of PS and PS/crosslinked PMA blends

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