Competitive reactions during compatibilization of blends of polybutyleneterephthalate with epoxide-containing rubber

Martin, Philippe; Devaux, Jacques; Legras, Roger; Gurp, M. van; Duin, Martin van

doi:10.1016/s0032-3861(00)00496-1

Cited by 91 publications

(93 citation statements)

References 33 publications

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“…On the contrary, if the two components in a binary blend have good compatibility, the dispersion particles would uniformly disperse in the matrix with relatively smaller particle size and has no obvious demarcation with matrix phase. [30][31][32][33] The SEM of cryo-fractured surfaces of PLA/SGC (40/10) and PLA/SGC/MDI blends with different amounts of MDI are employed to study the phase morphology, as shown in …”

Section: Sem Morphology Of Pla/sgc/mdi Blendsmentioning

confidence: 99%

Highly toughened polylactide with novel sliding graft copolymer by in situ reactive compatibilization, crosslinking and chain extension

Kang

Shen

et al. 2014

Polymer

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Abstract:The "sliding graft copolymer'' (SGC), in which many linear poly-ε-caprolactone (PCL) side chains are bound to cyclodextrin rings of a polyrotaxane (PR), was prepared and employed to toughen brittle polylactide (PLA) with methylene diphenyl diisocyanate (MDI) by reactive blending. The SGC was in situ crosslinked and therefore transformed from a crystallized plastic into a totally amorphous elastomer during reactive blending. Meanwhile, PLA-co-SGC copolymer was formed at interface to greatly improve the compatibility between PLA and SGC, and the chain extension of PLA also occurred, were confirmed by FTIR, GPC, SEM, and TEM. The resulting PLA/SGC/MDI blends displayed super impact toughness, elongation at break and nice biocompatibility. It was inferred from these results the crosslinked SGC (c-SGC) elastomeric particles with sliding crosslinking points performed as stress concentrators and absorbed considerable energy under impact and tension process.

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Section: Sem Morphology Of Pla/sgc/mdi Blendsmentioning

confidence: 99%

Highly toughened polylactide with novel sliding graft copolymer by in situ reactive compatibilization, crosslinking and chain extension

Kang

Shen

et al. 2014

Polymer

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“…Graft copolymers were prepared by in-situ polymerization by adding monomer styrene (45.97 cm 3 ) to a toluene solution of the EPDM polymer (10 g). Dibenzoyl-peroxide (0.39 g) was used as an initiator and the reaction was carried out at 90°C.…”

Section: Preparation Of Samplesmentioning

confidence: 99%

“…Combining two polymers by blending is one of the most favourite techniques used to generate new polymeric materials, as confirmed by the available literature on polymer blends abounding in data on immiscible systems [1][2][3][4][5]. Most incompatible polymer blends often manifest high interfacial tension and weak adhesion at the interfaces between the dispersed phase and the matrix.…”

Section: Introductionmentioning

confidence: 96%

Effect of the structure of ethylene-propylene-diene-graft-polystyrene graft copolymers on morphology and mechanical properties of SAN/EPDM blends

Ptiček¹,

Hrnjak-Murgić²,

Jelenčić³

2007

Express Polym. Lett.

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Abstract. Ethylene-propylene-diene-graft-polystyrene (EPDM-g-PS) copolymers were synthesized to obtain different structures of graft copolymers with different graft lengths and graft densities. The structure of synthesized EPDM-g-PS copolymers was characterized by gel permeation chromatography (GPC) and by Fourier transforms infrared spectroscopy (FTIR). These presynthesized graft copolymers were added (5 phr) to styrene-acrylonitrile (SAN) and ethylene-propylenediene (EPDM) blends, prepared to maintain the following SAN/EPDM ratios a) 95/5 and b) 90/10. SAN/EPDM blends were characterized by the determination of mechanical properties (tensile strength, elongation at break) while their morphology was inspected by scanning electronic microscopy, SEM. The obtained results show that various structures of EPDM-g-PS copolymers influence the miscibility in SAN/EPDM blends. Optimal concentration of side branches of graft copolymers provide the finest morphology and enhance mechanical properties.Keywords : mechanical properties, graft copolymer, styrene-acrylonitrile, ethylene-propylene-diene monomer, morphology eXPRESS Polymer Letters Vol.1, No.3 (2007) [173][174][175][176][177][178][179] Available online at www.expresspolymlett.com DOI: 10.3144/expresspolymlett.2007.27 In order to obtain different structures of graft copolymers (graft densities), the use of various types of coagents has become popular in many investigations [11]. Thus, the participation of a small amount of coagent (triallylcyanurate, TAC) will suppress the grafting reaction at the tertiary Catom of the main chain of the EPDM polymer, which leads to a diminished grafting efficiency [12]. The diversity of possible structures along with the adequate selection of the main backbone facilitates the process of tailoring of the properties of graft copolymers. Grafting reactions could induce significant changes in the polymer chain like the chemical composition, the polymer chain structure, the size of molecular masses and these parameters are responsible for the interactions between polymers. The aim of this work was to investigate the effect of various structures of presynthesized EPDM-g-PS copolymers on interactions between SAN and EPDM polymers in blends. The effect of dissimilar graft copolymers structures on compatibility in blends was followed by the examination of morphology and the determination of mechanical properties. Experimental MaterialsPolymers used for the synthesis of graft copolymers were ethylene-propylene-diene (EPDM, Keltan 312, DSM) containing 55 wt% ethylene and 4 wt% ethylidene norbornene, Mooney viscosity 36 MU, monomer styrene (St) 99.8 wt% was supplied by DIOKI (Croatia), and the triallylcyanurate (TAC; purity: 50 wt%) which was used as coagent, was purchased to Bayer. Polymers used for the preparation of studied blends, were the above described EPDM and styrene-acrylonitrile (SAN, Tyril 790, The Dow Chemical Company) with 24 wt% AN, the melt flow rate (MFR, measured at 220°C, using a load of 10 kg) was 22 g/10 min. Preparati...

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“…According to the literature, 33 interfacial reactions were considered the main reactions between PBT and PS-GMA; however, one cannot discard the occurrence of crosslinking reactions. Figure 2 shows torque curves for PBT and PBT/ PS-GMA mixtures containing PS-GMA with similar GMA contents (4 wt % of GMA in PS-GMA) and different molecular weights (M w ¼ 18,000; 26,000; 33,000; and 63,000 g mol À1 ).…”

Section: Torque Rheometry Testsmentioning

confidence: 99%

Effects of the molecular structure of impact modifier and compatibilizer on the toughening of PBT/SBS/PS‐GMA blends

Canto

Hage

Pessan

2006

J of Applied Polymer Sci

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This work aims at studying the toughening process of poly(butylene terephthalate) (PBT) through its blends with styrene-butadiene-styrene block copolymers (SBS), in the presence of poly(styrene-ran-glicydil methacrylate) (PS-GMA) as reactive compatibilizer. High values of impact strength were attained for PBT/SBS blends without the compatibilizer; however, this improvement is achieved for blends with SBS having similar viscosity compared to PBT, at high SBS content (40 wt %) and for blends prepared under specific processing conditions. The efficiency of the in situ compatibilization of PBT/SBS blends by PS-GMA was found to be strongly dependent on the SBS and PS-GMA molecular characteristics. Better compatibilizing results were observed through fine phase morphologies and lower ductile to brittle transition temperatures (DBTT) as the interfacial interaction and stability of the in situ formed compatibilizer are maximized, that is, when the miscibility between SBS and PS-GMA and reaction degree between PBT and PS-GMA are maximized. For the PBT/SBS/PS-GMA blends under study, this was found when it is used the SBS with higher polystyrene content (38 wt %) and with longer PS blocks (M w ¼ 20,000 g mol À1) and also the PS-GMA with moderate GMA contents (4 wt %) and with molecular weight similar to the critical one for PS entanglements (M c ¼ 35,000 g mol À1).

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Competitive reactions during compatibilization of blends of polybutyleneterephthalate with epoxide-containing rubber

Cited by 91 publications

References 33 publications

Highly toughened polylactide with novel sliding graft copolymer by in situ reactive compatibilization, crosslinking and chain extension

Highly toughened polylactide with novel sliding graft copolymer by in situ reactive compatibilization, crosslinking and chain extension

Effect of the structure of ethylene-propylene-diene-graft-polystyrene graft copolymers on morphology and mechanical properties of SAN/EPDM blends

Effects of the molecular structure of impact modifier and compatibilizer on the toughening of PBT/SBS/PS‐GMA blends

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