Diffusion and Polymerization Behavior of Styrene in Polypropylene Pellets of Different Aggregation State†

doi:10.7503/cjcu20170492

Abstract

Abstract:

Diffusion and polymerization behavior of styrene(St) in homo-polypropylene and co-polypropylene(PP) were studied. The results show that the presence of ethylene-propylene copolymerization region in co-polypropylene can provide more free volume for the diffusion of St, so the diffusion rate of St is faster and the diffusion saturation of PS is higher. Moreover, the size of polystyrene(PS) nanoparticles in co-polypropylene increased from 115 nm to 150—200 nm. Since the aggregation states of PP pellets are different, the PS distribution in PP pellets will change from the “M” shape curve of homo-polypropylene to the “n” shape curve of co-polypropylene. Owing to the chemical grafting of St in PP pellets, PS nanoparticles were aggregating instead of coalescing during processing and the tensile strength, elastic modulus and breaking elongation were improved significantly, reflects the role of strengthening and toughening by PS rigid particles.

Key words: Homo-polypropylene, Co-polypropylene, Ethylene-propylene copolymer amorphousregion, Diffusion, Polymerization

CLC Number:

O631

TrendMD:

HUANG Chenghuan, GUO Zhaoxia, YU Jian. Diffusion and Polymerization Behavior of Styrene in Polypropylene Pellets of Different Aggregation State^†[J]. Chem. J. Chinese Universities, 2018, 39(2): 382.

Figures/Tables 11

Fig.1 PS content as a function of diffusion time

Fig.2 FESEM images of the cross-section of PP(S1003)(A) and PP(S1003)/PS nanoalloy pellet(B—D)(B) Near the surface of PP(S1003)/PS; (C) mid-depth from the surface to the center of PP(S1003)/PS; (D) center of PP(S1003)/PS.

Fig.3 FESEM images of the cross-section of PP(B4908)(A) and PP(B4908)/PS nanoalloy pellet(B—D)(B) Near the surface of PP(B4908)/PS; (C) mid-depth from the surface to the center of PP(B4908)/PS; (D) center of PP(B4908)/PS.

Fig.4 FESEM images of the cross-section of PP(R-Y40-V)(A) and PP(R-Y40-V)/PS nanoalloy pellet(B—D)(B) Near the surface of PP(R-Y40-V)/PS; (C) mid-depth from the surface to the center of PP(R-Y40-V)/PS;(D) center of PP(R-Y40-V)/PS.

Scheme 1 Illustration of diffusion and polymerization process of Homo-PP and Co-PP

Fig.5 Micro-FTIR profiles of PP/PS pellets along the diameter direction

Fig.6 FTIR spectra of PP/PS pelletsa. PP; b. PP(S1003)/PS; c. PP(B4908)/PS;d. PP(R-Y40-V)/PS.

Table 1 Graft ratio and peak area ratio of PP/PS nanoblends

Sample	PS content(%)	Graft ratio(%)	Peak area ratio of PS/PP
PP(S1003)/PS	18.3	1.88	0.17
PP(B4908)/PS	21.7	4.52	0.42
PP(R-Y40-V)/PS	21.3	5.10	0.52

Fig.7 FESEM images of the cross-section of PP/PS(A) PP(S1003)/PS; (B) PP(B4908)/PS; (C) PP(R-Y40-V)/PS.

Fig.8 Representative tensile stress-strain curves of PP and PP/PS

Table 2 Mechanical properties of PP and PP/PS injection-molded bar

Sample	Young’s modulus/MPa	Tensile strength/MPa	Elongation at break(%)	Impact strength/MPa
PP(S1003)	317.9±5.9	36.4±0.8	437.7±32.1	4.4±0.1
PP(S1003)/PS	344.1±6.3	37.0±0.7	514.9±21.8	4.5±0.2
PP(B4908)	137.7±5.8	29.5±0.8	541.6±32.8	4.8±0.1
PP(B4908)/PS	191.9±4.4	30.0±1.1	556.5±52.6	5.1±0.1
PP(R-Y40-V)	127.1±5.2	25.7±0.4	446.7±7.5	4.6±0.1
PP(R-Y40-V)/PS	208.8±6.3	26.0±0.3	510.0±21.1	5.2±0.1

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