Synthesis and Properties of Carbazole-functionalized Isotactic Polypropylenes

Rui-ning Shang; Huan Gao; Yu-lian Li; Bin Wang; Zhe Ma; Li Pan; Yue-sheng Li

doi:10.11777/j.issn1000-3304.2019.19081

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Synthesis and Properties of Carbazole-functionalized Isotactic Polypropylenes

Research Article | 更新时间：2021-01-26

- Synthesis and Properties of Carbazole-functionalized Isotactic Polypropylenes
- Acta Polymerica Sinica Vol. 50, Issue 11, Pages: 1187-1195(2019)
- 作者机构：
  
  天津大学材料科学与工程学院　天津 300350
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2019.19081
  CLC：
- Published：2019-11，
  
  Published Online：27 May 2019，
  
  Received：18 April 2019，
  
  Revised：6 May 2019，
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Rui-ning Shang, Huan Gao, Yu-lian Li, Bin Wang, Zhe Ma, Li Pan, Yue-sheng Li. Synthesis and Properties of Carbazole-functionalized Isotactic Polypropylenes. [J]. Acta Polymerica Sinica 50(11):1187-1195(2019)
DOI：

Rui-ning Shang, Huan Gao, Yu-lian Li, Bin Wang, Zhe Ma, Li Pan, Yue-sheng Li. Synthesis and Properties of Carbazole-functionalized Isotactic Polypropylenes. [J]. Acta Polymerica Sinica 50(11):1187-1195(2019) DOI： 10.11777/j.issn1000-3304.2019.19081.

摘要

通过丙烯与带有咔唑功能基团的

-烯烃的直接共聚合得到了一系列具有高分子量、高插入率的新型功能化等规聚丙烯. 高效的均相非茂金属催化剂体系，二甲基吡啶胺铪/[Ph

C][B(C

)

]/Al

，对于咔唑基团表现出很好的耐受性和共聚能力，在温和的反应条件下高效地实现了丙烯与11-咔唑-1-十一碳烯的共聚反应，并且聚合反应活性较高(最高可达4.08 × 10

polymer

mol

Cat.

−1

). 共聚所得功能化聚合物具有高分子量(最高可达7.02 × 10

)、高插入率(最高可达13.5 mol%)和高立构规整度([mmmm]

99%). 大多数共聚物都表现出高熔融温度和良好的热稳定性(

约为450 °C)，同时共聚物的表面性能有了十分明显的改善，并且其力学性能也得到了明显的提高，断裂伸长率最高达727%. 此外咔唑基团的引入赋予了共聚物独特的荧光性质，使该类功能聚丙烯材料在光电器件方面具有潜在的应用价值和广阔的应用空间.

Abstract

A series of novel amino-functionalized isotactic polypropylenes with high molecular weight and satisfying functional comonomer incorporation were prepared by direct copolymerization of propylene and

-olefins carrying carbazole functional groups. The homogeneous non-metallocene catalyst system consisting of dimethyl(pyridylamido)Hf(IV) complex

[Ph

C][B(C

)

]

and Al

showed good tolerance to carbazole groups and promoted the copolymerization of propylene with 11-carbazole-1-undecene effectively under mild reaction conditions

in which very high catalytic activity (up to 4.08 × 10

polymer

mol

Cat.

−1

) was achieved. The functional copolymers obtained possessed high molecular weight (up to 7.02 × 10

) and tacticity ([mmmm]

99%)

as well as decent incorporation of carbazole functional groups (up to 13.5 mol%). Besides

DSC and TGA results verified the excellent thermostability of most copolymer products by giving decomposition temperatures around 450 °C as well as high melting points. Representative physical properties such as hydrophilicity

mechanical performance

and fluorescent characteristics of these

PPs functionalized by carbazole groups have also been explored. The increased incorporation of 11-carbazole-1-undecene monomer could reduce the water contact angle gradually and thus make significant improvement in surface properties; the copolymers became hydrophilic when comonomer incorporation exceeded 4.1 mol%. In terms of the mechanical properties

elongation at break of the copolymer barely increased at low incorporation (1.2 mol%)

and the material still showed typical attributes of rigidity and brittleness. As more 11-carbazole-1-undecene monomer was incorporated (

6.2 mol%)

toughness of the materials was dramatically enhanced yet their stiffness was inevitably sacrificed. In addition

the introduction of carbazole group endowed the copolymers with unique fluorescent characteristics—they could emit purple fluorescence under 365 nm UV light in both solution and film states

thereby making this kind of functional polypropylene materials valuable and promising for the extensive applications in optoelectronic devices.

关键词

功能化聚丙烯荧光性热稳定性亲水性能力学性能过渡金属催化剂

Keywords

Functional polypropyleneFluorescent propertyThermostabilityHydrophilicityMechanical propertyTransition metal catalyst

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