Synthesis and characterization of maleic anhydride grafted polypropylene with a well-defined molecular structure

Min Zhang, Ralph H. Colby, Scott Thomas Milner, Tze-chiang Chung, Tianzi Huang, Willem Degroot

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Despite the commercial importance of maleic anhydride grafted polypropylene (PP-g-MAH), it has long been a scientific challenge to prepare this polymer with a well-controlled molecular structure. This paper discusses a new chemical route that can form PP-g-MAH with desirable MAH content, a single MAH incorporated unit, white color, high molecular weight, and narrow molecular weight and composition distributions. The chemistry involves a unique PP-co-p-BT copolymer as the "reactive intermediate" that can be effectively prepared by metallocene-mediated copolymerization of propylene and p-(3-butenyl)toluene (p-BT), with narrow molecular weight and composition distributions, high molecular weight, and a broad range of p-BT contents. The incorporated p-BT comonomer units provide the reactive sites for the subsequent free radical MAH graft reaction under a suspension condition at a low reaction temperature. The resulting PP-g-MAH polymers were carefully examined by a combination of NMR and GPC measurements, which shows almost no change in polymer molecular weight and distribution and a single MAH incorporation (no oligomerization). The incorporated MAH units increase with the increase of initiator concentration, p-BT content, and reaction time. Evidently, the combination of high reactivity of φ-CH 3 moiety, a favorable mixing condition between the reactive sites and chemical reagents in the swollen amorphous phases, and low reaction temperature results in MAH grafting reaction selectively taking place at the φ-CH 3 moieties without side reactions (i.e., chain degradation and MAH oligomerization). In addition, this suspension reaction process presents an economic method to prepare PP-g-MAH with high polymer content and easy product purification.

Original languageEnglish (US)
Pages (from-to)4313-4323
Number of pages11
JournalMacromolecules
Volume46
Issue number11
DOIs
StatePublished - Jun 11 2013

Fingerprint

Maleic Anhydrides
Polypropylenes
Toluene
Maleic anhydride
Molecular structure
Molecular weight
Polymers
Oligomerization
Suspensions
Chemical analysis
Free radicals
Grafts
Copolymerization
Propylene
Free Radicals
Purification
Copolymers
Nuclear magnetic resonance
Color
Degradation

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

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abstract = "Despite the commercial importance of maleic anhydride grafted polypropylene (PP-g-MAH), it has long been a scientific challenge to prepare this polymer with a well-controlled molecular structure. This paper discusses a new chemical route that can form PP-g-MAH with desirable MAH content, a single MAH incorporated unit, white color, high molecular weight, and narrow molecular weight and composition distributions. The chemistry involves a unique PP-co-p-BT copolymer as the {"}reactive intermediate{"} that can be effectively prepared by metallocene-mediated copolymerization of propylene and p-(3-butenyl)toluene (p-BT), with narrow molecular weight and composition distributions, high molecular weight, and a broad range of p-BT contents. The incorporated p-BT comonomer units provide the reactive sites for the subsequent free radical MAH graft reaction under a suspension condition at a low reaction temperature. The resulting PP-g-MAH polymers were carefully examined by a combination of NMR and GPC measurements, which shows almost no change in polymer molecular weight and distribution and a single MAH incorporation (no oligomerization). The incorporated MAH units increase with the increase of initiator concentration, p-BT content, and reaction time. Evidently, the combination of high reactivity of φ-CH 3 moiety, a favorable mixing condition between the reactive sites and chemical reagents in the swollen amorphous phases, and low reaction temperature results in MAH grafting reaction selectively taking place at the φ-CH 3 moieties without side reactions (i.e., chain degradation and MAH oligomerization). In addition, this suspension reaction process presents an economic method to prepare PP-g-MAH with high polymer content and easy product purification.",
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Synthesis and characterization of maleic anhydride grafted polypropylene with a well-defined molecular structure. / Zhang, Min; Colby, Ralph H.; Milner, Scott Thomas; Chung, Tze-chiang; Huang, Tianzi; Degroot, Willem.

In: Macromolecules, Vol. 46, No. 11, 11.06.2013, p. 4313-4323.

Research output: Contribution to journalArticle

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AU - Colby, Ralph H.

AU - Milner, Scott Thomas

AU - Chung, Tze-chiang

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AU - Degroot, Willem

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