Kai Ma’s research while affiliated with Hebei University of Technology and other places

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Publications (2)


Table 1 . Element content and pore structure parameters of the support and catalysts. 
Table 2 . The effect of IED on 1-butene slurry polymerization a . 
Table 2 . The effect of IED on 1-butene slurry polymerization a . 
MgCl2-Supported Titanium Ziegler-Natta Catalyst Using Carbon Dioxide-Based Poly(propylene ether carbonate) Diols as Internal Electron Donor for 1-Butene Polymerization
  • Article
  • Full-text available

November 2017

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486 Reads

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1 Citation

Polymers

Xiaopeng Cui

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Qing Bai

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Kai Ma

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MgCl2-supported titanium Ziegler-Natta catalyst containing CO2-based poly(propylene ether carbonate) diols as a potential internal electron donor (IED) was synthesized and employed for 1-butene polymerization. When compared with the Ziegler-Natta catalyst using poly(polypropylene glycol) as IED, the catalyst prepared with poly(propylene ether carbonate) diols showed good particle morphology, higher activity and stereoselectivity. The results suggested that existence of the carbonate group within the structure of poly(propylene ether carbonate) diols truly plays an important role in improving the performance of the catalyst for the 1-butene polymerization.

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Synthesis of flame-retarding oligo(carbonate-ether) diols via double metal cyanide complex-catalyzed copolymerization of PO and CO2 using bisphenol A as chain transfer agent

May 2016

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20 Reads

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32 Citations

Flame-retarding oligo(carbonate-ether) diols were successfully prepared with considerable efficiency by copolymerization of propylene oxide (PO) and carbon dioxide (CO2) using a Zn3[Co(CN)6]2-based double metal cyanide complex (DMC) in the presence of bisphenol A (BPA) as a chain transfer agent (CTA). The effects of molar ratio of PO to BPA, temperature, pressure and reaction time on the copolymerization were systematically investigated. The number average molecular weight (Mn) of the oligo(carbonate-ether) diols is in good linear relationship to the molar ratio of PO to BPA and can be facility tuned in the range of 1000-2400 g mol-1 by adjusting reaction temperature and reaction time at fixed PO/BPA = 25.0. Lower temperature and higher CO2 pressure were beneficial for incorporating CO2 into the oligomer chain. The oligomer with a carbonate (CU) of 42% and Mn of 2400 g mol-1 is obtained at 2.0 MPa CO2 pressure and 75 °C with productivity of 2.4 kg g-1 DMC within 6 h.

Citations (2)


... In case of Cat-B and Cat-C, the used Lewis bases (DIBP and EB) may have changed the electron density of Ti center compared to the Cat-A which does not contain any electron donor in its structure. [48] Cat-A does not contain any internal Lewis base, while Cat-B and Cat-C are having diisobutyl phthalate and ethyl benzoate as internal Lewis bases respectively in their structure. To understand this type of catalyst behaviors by these three catalyst systems, we have further studied all the three catalysts (Cat-A, Cat-B and Cat-C) for their detailed polymerization kinetics and product performance. ...

Reference:

Trans-1,4-polybutadiene: Influences of Lewis bases on polymerization of butadiene with supported titanium catalyst systems View supplementary material Trans-1,4-polybutadiene: Influences of Lewis bases on polymerization of butadiene with supported titanium catalyst systems
MgCl2-Supported Titanium Ziegler-Natta Catalyst Using Carbon Dioxide-Based Poly(propylene ether carbonate) Diols as Internal Electron Donor for 1-Butene Polymerization

Polymers

... Poly(carbonate urethane)s (PCUs) prepared using polycarbonate diols (PCDLs) as the soft segment offer numerous advantages over PUs synthesized from conventional polyether and polyester diols, including exceptional mechanical properties, hydrolysis resistance, abrasive resistance, oil resistance, chemical resistance, and excellent biocompatibility [9][10][11][12]. As a result, the demand for PCDLs as a feedstock for PCUs has been increasing in recent years. 2 of 15 Various methods have been used to prepare PCDLs, including the reaction of diols with phosgene or phosgene derivatives [13], ring-opening polymerization of cyclic carbonates [14], transesterification of dimethyl carbonate with micromolecule diols [15], and alcoholysis of high-molecular-weight poly(propylene carbonate) [16]. The increasing focus on environmental protection and sustainable development has led to the recognition of CO 2 as a crucial raw material for chemical and polymer syntheses [17][18][19], of which the direct utilization of CO 2 in the production of degradable low-molecular-weight polycarbonate polyols or oligo(carbonate-ether) polyols through epoxides/CO 2 copolymerization has gained significant attention from both academic research and industrial productions over the past few decades [13,14,[20][21][22][23]. ...

Synthesis of flame-retarding oligo(carbonate-ether) diols via double metal cyanide complex-catalyzed copolymerization of PO and CO2 using bisphenol A as chain transfer agent
  • Citing Article
  • May 2016