Structure and mechanism of functional isotactic polypropylene via <i>in situ</i> chlorination graft copolymerization

Wang, Shuangshuang; Zhao, Zhiqiang; Wang, Na; Zhao, Jian; Feng, Ying

doi:10.1002/pi.3044

Cited by 14 publications

(12 citation statements)

References 29 publications

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“…In literature, it is interpreted as the perfection of the crystal structure during the melting process [15]. With the current study, a very different conclusion is made about the double melting points based on our studies with multiple techniques, including degradation characterization [18].…”

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confidence: 59%

Crystallization, Structures, and Properties of Different Polyolefins with Similar Grafting Degree of Maleic Anhydride

et al. 2020

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Maleic anhydride (MAH) grafting to different polyolefins with similar grafting degree can have different effects on crystallization, crystal structure, and mechanical and thermal properties. The grafting leads to a smaller crystal size, less ordered lamellar structure, and a shorter long period for HDPE, LLDPE, and PP. The grafting makes PP lamellar packing less ordered the most and almost no effect to LLDPE. The grafting does not have that much impact on the crystallization ability of the HDPE, LLDPE, and HDPE/PP blend, but appreciably reduces the crystalline ability of PP-g-MAH, due to a dramatical drop in its molecular weight during the grafting process. As a result, the grafting makes PP a very brittle material with a lowered average melting point than the corresponding neat PP, but the grafting has almost no effect on elongation at break for LLDPE and some effect on HDPE (decreased by one-third). However, the PP degradation due to MAH grafting can be avoided in the presence of PE component, i.e., making the grafting of PP and PE at the same time with HDPE/PP blend. The grafted HDPE/PP blend shows a significantly improved compatibility, which leads to overall appreciably better mechanical properties than the neat HDPE/PP blend.Polymers 2020, 12, 675 2 of 13 slightly with addition of small amount of PP-g-MAH, while mechanical dampening decreased with addition of PP-g-MAH.It is well known that the degree of MAH grafting can have significant impact on the crystallization and structure of polyolefins. The melting temperature of HDPE-g-MAH decreases as increase in grafting content from 0.2% to 0.8%, [14] but increases with further increase in grafting degree. The crystallization, melting behavior and structures of PP with different maleic anhydride contents (AC = 0.5 mass%, 1 mass%, 3 mass%) was investigated by Menyhárd et al. [15] Liu et al. prepared and studied maleic anhydride/styrene-grafted PPR (polypropylene random copolymer) with grafting degrees of 1.38%, 2.25%, and 2.42%, respectively, and it is found that the crystallization rate of this MPP is higher than the neat PP and increases with the increase in grafting degree [16].Although there are quite a number of studies on MAH grafted polyolefins-including PP [15,16], high-density polyethylene (HDPE) [14], and linear low-density polyethylene (LLDPE) [17]-the different effects of similar MAH grafting degree on crystallization, structures, and properties of different polyolefins have not been explored. In the present work, a series of MAH grafted polyolefins are studied, including maleic anhydride grafted high-density polyethylene (HDPE-g-MAH), maleic anhydride grafted low-density polyethylene (LLDPE-g-MAH), PP-g-MAH and maleic anhydride grafted polypropylene/maleic anhydride grafted high-density polyethylene (PP-g-MAH/HDPE-g-MAH) blends (1:1). The crystallization kinetics, thermal behavior, crystal structure, lamellar packing, and crystal size of these grafted polyolefins, together with the corresponding non-grafted polymers, are discussed, which provides a ...

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confidence: 59%

Crystallization, Structures, and Properties of Different Polyolefins with Similar Grafting Degree of Maleic Anhydride

et al. 2020

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“…For example, antibacterial [12], antifouling [13] and hydrogen storage [14] properties of polypropylene were enhanced via surface-initiated atom transfer radical polymerization [15]. Chlorine atoms on the polymer chains both develop polarity and allow reactive sites for a series of monomer such as acrylates, methacrylates and styrenes [16][17][18][19]. Polymers containing chlorine atoms, such as chlorinated poly (vinyl chloride) (CPVC), poly(vinyl chloride) (PVC), chlorinated polyethylene and polypropylene exhibit high fire and cold resistance as well as plasticity.…”

Section: Introductionmentioning

confidence: 99%

Polypropylene-based graft copolymers via CuAAC click chemistry

Açık¹,

Sey²,

Taşdelen³

2018

Express Polym. Lett.

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Abstract. Graft copolymers from commercial chlorinated polypropylene (PP-Cl) possessing either poly(ethylene glycol) (PEG) or poly(ɛ-caprolactone) (PCL) grafts are synthesized by copper (I)-catalyzed azide-alkyne cycloaddition 'click' reaction (CuAAC). For this purpose, azido-functional polypropylene is prepared by nucleophilic substitution of chlorine groups of PP-Cl with azidotrimethylsilane-tetrabutylammonium fluoride. Whereas, the clickable alkyne end-functional PEG and PCL are independently synthesized by esterification reaction of poly(ethylene glycol) methyl ether with 4-pentyonic acid at room temperature and ring-opening polymerization of ε-caprolactone using stannous octoate as catalyst and propargyl alcohol as initiator. Finally, the corresponding graft copolymers, PP-g-PEG and PP-g-PCL, with different surface properties were successfully synthesized by CuAAC 'click' reaction under mild condition. Spectral, chromatographic and thermal analyses at various stages prove the formation of desired polypropylene-based graft copolymers with well-defined properties. Furthermore, the water contact angle values of PP-Cl, PP-g-PEG and PP-g-PCL are found as 90±1°, 78±1.8° and 83±2.1°, respectively.

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“…CPVC-cg-MAH is a kind of new material achieved through maleic anhydride (MAH) grafted onto PVC via in situ chlorinating graft copolymerization (ISCGC). 11 Compared with other conventional grafting processes, ISCGC is a novel, convenient, and economically feasible method to prepare graft copolymers, and it has been successfully applied to PE, 12,13 PVC, 14 and PP 15,16 modification in our previous works. In this process, PVC is chlorinated or grafted using the mechanism of free radicals.…”

Section: Introductionmentioning

confidence: 99%

Preparation of anhydridized chlorinated polyvinyl chloride with enhanced properties and investigation of the factors affecting the chain structure of the graft copolymer

Zhao

et al. 2013

Journal of Elastomers & Plastics

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A graft copolymer, composed of maleic anhydride as side group and chlorinated polyvinyl chloride as backbone, was prepared via in situ chlorinating graft copolymerization. The effect of graft degree of the graft copolymer on the chain structure is discussed through proton nuclear magnetic resonance. The results of differential scanning calorimetry and thermogravimetic analysis showed glass transition temperature of the graft copolymer did not change with increase in graft degree, but thermal stability of the product improved much with increase in graft degree. The results of gel content measurements showed the increasing graft degree was favorable to prevent cross-linking reaction of the product.

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Structure and mechanism of functional isotactic polypropylene via in situ chlorination graft copolymerization

Cited by 14 publications

References 29 publications

Crystallization, Structures, and Properties of Different Polyolefins with Similar Grafting Degree of Maleic Anhydride

Crystallization, Structures, and Properties of Different Polyolefins with Similar Grafting Degree of Maleic Anhydride

Polypropylene-based graft copolymers via CuAAC click chemistry

Preparation of anhydridized chlorinated polyvinyl chloride with enhanced properties and investigation of the factors affecting the chain structure of the graft copolymer

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