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

Polymer ◽  
2014 ◽  
Vol 55 (16) ◽  
pp. 4313-4323 ◽  
Author(s):  
Xue Li ◽  
Hailan Kang ◽  
Jianxiang Shen ◽  
Liqun Zhang ◽  
Toshio Nishi ◽  
...  
Keyword(s):  
Graft Copolymer ◽  
Chain Extension ◽  
Reactive Compatibilization

scholarly journals Effect of Diisocyanates as Compatibilizer on the Properties of BF/PBAT Composites by In Situ Reactive Compatibilization, Crosslinking and Chain Extension

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 806 ◽  
Author(s):  
Xiwei Xie ◽  
Caili Zhang ◽  
Yunxuan Weng ◽  
Xiaoqian Diao ◽  
Xinyu Song
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Phenyl Isocyanate ◽  
Chain Extension ◽  
Hydroxyl Group ◽  
Reactive Compatibilization ◽  
Carbamate Group ◽  
Bamboo Powder ◽  
Reactive Compatibilizer

Due to the hydrophobic nature of poly (butylene terephthalate) (PBAT), and the hydrophilic nature of bamboo flour (BF), a BF/PBAT (50/50) blend shows low mechanical properties, and especially shows poor impact strength. In order to increase the interfacial adhesion between BF and PBAT, diisocyanate was used as a reactive compatibilizer to modify bamboo powder. A series of BF/PBAT composites were prepared by the method of mixing and melting in an internal mixer. After adding reactive compatibilizer 4,4′-methylenebis(phenyl isocyanate) (MDI), BF/PBAT (50/50) composites with high mechanical properties were successfully prepared. The tensile strength, elongation at break, and impact strength of the BF/MDI-2/PBAT composite with 2 wt % MDI content were increased by 1.9, 6.8, and 4.3 times respectively over the BF/PBAT blend without the added MDI. The higher toughening effect of MDI in BF/PBAT composites can be mainly ascribed to the improved interface bonding between BF and PBAT. The isocyanate group of MDI can react with the hydroxyl group on the BF surface and in situ formation of the carbamate group on the BF surface. The residual isocyanate can then react with the hydroxyl group of PBAT and form carbamate groups. The rheological behaviors demonstrate that addition of appropriate amounts of MDI, 1 wt % and 2 wt %, can promote the flowability of the molten BF/PBAT composites due to the decrease in interparticle interaction between bamboo powder and the increase in the thermal motion of the molecules.

Compatibilization of Polypropylene/Corn Starch Plasticized with Diethanol Amine

2012 ◽  
Vol 610-613 ◽  
pp. 475-479
Author(s):  
Jia Hao Qiu ◽  
Pin Gan Song ◽  
Shen Yuan Fu ◽  
Xian Xun Ge ◽  
Bing Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corn Starch ◽  
Intermolecular Hydrogen Bonding ◽  
Starch Granules ◽  
Reactive Compatibilization ◽  
Hydrogen Bonding Interactions ◽  
Potential Applications ◽  
Plasticized Starch ◽  
Reduction Effect

In the presented paper, diethanol amine is employed to plasticize corn starch, and plasticized starch is incorporated into polypropylene to create semibio-based composites with the aid of compatibilizer, maleic anhydride-grafted PP (PPMA). Compared with PP/starch blend, the presence of diethanol amine changes the morphology and increases the plasticity of starch due to the reduction effect of intermolecular hydrogen bonding interactions. Adding PPMA could reduce the dispersed size of starch granules in the polymer matrix due to in situ reactive compatibilization. Addition of 30 wt% PPMA decreases the starch granules size from ~10 μm to ~5 μm, and increases the tensile strength from 16 MPa for PP/plasticized starch to 30 MPa, increased by 87.5%. Thus, as-created bio-composites with improved mechanical properties will find many potential applications such as packaging.

In Situ Reactive Compatibilization of Polyamide 6 and Polycarbonate Blend by the Catalytic Effect of Phenol Novolac

2020 ◽  
Vol 59 (5) ◽  
pp. 1855-1861 ◽  
Author(s):  
Takayuki Hirai ◽  
Kenichi Yagi ◽  
Kazuo Okamoto ◽  
Yusaku Onochi ◽  
Jumpei Kawada
Keyword(s):  
Catalytic Effect ◽  
Polyamide 6 ◽  
Reactive Compatibilization

Compatibilization and toughening of immiscible ternary blends of polyamide 1010, polypropylene, and ABS resin

2012 ◽  
Vol 32 (8-9) ◽  
pp. 487-492 ◽  
Author(s):  
Jiamin Zhang ◽  
Yongfang Li ◽  
Yong Zhu ◽  
Maojin Cui ◽  
Xiaoying Jiang
Keyword(s):  
Graft Copolymer ◽  
Ternary Blends ◽  
Elongation At Break ◽  
Melt Grafting ◽  
Potential Applications ◽  
Abs Resin ◽  
Pp Blends ◽  
The Impact ◽  
Polyamide 1010

Abstract The ternary blends of three versatile polymers of polyamide 1010 (PA1010), polypropylene (PP), and ABS resin (ABS) were studied. As a compatibilizer, PP was multimonomer melt grafted in the presence of maleic anhydride (MAH), styrene (St), and dicumyl peroxide. The effects of multimonomers melt grafting blends of MAH and St on the crystallization behavior, morphology, and mechanical properties of PA1010/ABS/PP blends were investigated. The results showed that the graft copolymer generated in situ by the anhydride groups of grafted PP (g-PP) and the amino end of PA1010 has reduced the interfacial tension of blends efficiently. The interaction of St groups of the graft copolymer with ABS was helpful to improve the compatibility of the three components during melt blending process. The size of dispersed phases in the blends was reduced remarkably and the mechanical pro­perties were greatly improved when the content of g-PP in PA1010/ABS/PP blends is increased to 10%. The tensile strength of the compatibilized PA1010/ABS/PP blends was improved by a factor of 11.7, whereas the impact strength and elongation at break were increased by 4 and 4.9 times, respectively. The introduction of multimonomer melt g-PP is shown to be an effective approach to modifying immiscible multipolymer blends, which have many potential applications.

New materials from degraded styrene-acrylonitrile and ethylene-propylene-diene copolymers

e-Polymers ◽  
2004 ◽  
Vol 4 (1) ◽  
Author(s):  
Jasminka Vugrinec ◽  
Ljerka Kratofil ◽  
Zlata Hrnjak-Murgić ◽  
Jasenka Jelenčić
Keyword(s):  
Ir Spectroscopy ◽  
Polymer Blends ◽  
Graft Copolymer ◽  
Chloroform Solution ◽  
Polymerization Process ◽  
Time Interval ◽  
Grafting Reaction ◽  
Styrene Acrylonitrile

Abstract Polymer blends of styrene-acrylonitrile (SAN) and ethylene-propylenediene copolymer (EPDM) were prepared by casting films from chloroform solution. Their compositions were 95/5, 90/10 and 80/20, respectively. To simulate ageing, SAN/EPDM blends were degraded at 140°C for several different time intervals and the degree of degradation was followed by IR spectroscopy and by determination of molar masses. To recover thermally degraded SAN/EPDM blends, in situ polymerization by addition of styrene monomer was applied. Characterization of SAN and EPDM, graft copolymer and gel was carried out in order to reveal the polymerization process. Extractions of the polymers were made using solvents in a Soxhlet equipment: SAN in a mixture of acetone/ methanol, EPDM in hexane, graft copolymer in tetrahydrofuran, while the remaining part was considered as gel. Identification of extracted polymers has been conducted by IR spectroscopy. The presence of graft copolymer in the polymerization mixture proved the grafting reaction of polymer radicals. The highest content of graft copolymer was obtained for SAN/EPDM polymer blends that were exposed to thermal treatment for the longest time interval of 90 h.

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