Morphology and properties evolution upon ring-opening polymerization during extrusion of cyclic butylene terephthalate and graphene-related-materials into thermally conductive nanocomposites

Multiwalled carbon nanotubes (MWCNT)-reinforced polymerized cyclic butylene terephthalate (pCBT) nanocomposites were prepared by in situ ring opening polymerization of cyclic butylene terephthalate oligomers (CBT). The results of differential scanning calorimetry (DSC) indicated that the melting peak located at the low temperature (Tm1) increased and that at higher temperature (Tm2) decreased with the increasing of content of the MWCNT. During the cooling the MWCNT served as nucleation points from where crystallization can start. The more the MWCNT in the system the earlier the crystallization starts. The Morphological investigations performed by scanning electron microscopy (SEM) shown that the MWCNT were embedded in the matrix and held tightly by the matrix. The modulus and strength increased with MWCNT concentration in the nanocomposites, however, the elongation at break, absorbed energy at break and impact strength were decreased with the increasing of MWCNT content.

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CYCLIC BUTYLENE TEREPHTHALATE AND PROMISING FIELD OF APPLICATION

IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA ◽

10.6060/tcct.2017607.5558 ◽

2017 ◽

Vol 60 (7) ◽

pp. 4

Author(s):

Nikolay A. Chukov ◽

Muslim A. Mikitaev ◽

Mukhamed Kh. Ligidov ◽

Musa T. Bashorov ◽

Vladimir N. Shogenov ◽

...

Keyword(s):

Carbon Fibers ◽

Atmospheric Pressure ◽

Ring Opening ◽

Glass Fibers ◽

Ring Opening Polymerization ◽

Chemical Modifications ◽

Butylene Terephthalate ◽

Cyclic Butylene Terephthalate ◽

Physical And Chemical ◽

Structure Properties

Due to its unique characteristics, cyclic butylene terephthalate is used in novel developments of chemical industry. This article represents the review of the latest achievements in the field of processing, structure, properties of cyclic butylene terephthalate, its physical and chemical modifications as well as composites and nanocomposites based on it. In recent years, cyclic butylene terephthalate oligomers have drawn the attention of scientists. The oligomers can be acquired through the chemical reaction of cyclo-depolymerization and used as materials for ring-opening polymerization reactions. This method of polymerization has a variety of advantages compared to a standard method of synthesis polyesters. One of the main advantages of this method includes the capability to make polymerization reactions at standard atmospheric pressure, low required temperature, no side effects and obtaining a completely finished product as an outcome. The unique qualities of cyclic butylene terephthalate make it a promising material to be used as matrix for a variety of nano- and microcomposites and super concentrate. This study analyzes some of the examples of applying CBT as a super concentrate for creating materials like carbon nanotubes, laminated silicates, carbon fibers and glass fibers. In the majority of studies, the addition of nano-sized fillers into CBT leads to amplification of mechanical properties. In the cases of usage as fillers for carbon fibers and glass fibers, the possibility of replacing thermosetting resins with CBT is currently being researched. It could possibly lead to increase in manufacturability of carbon fibers and fiberglass and increase its possible area of application. Cyclic butylene terephthalate can also be used as a viscosity modifier for synthetic rubbers. In this case it can be both plasticizer and enhancing agent.For citation:Chukov N.A., Mikitaev M.A., Ligidov M.Kh., Bashorov M.T., Shogenov V.N., Pakhomov S.I. Cyclic butylene terephthalate and promising field of application. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 7. P. 4-13.

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Properties of polymerized cyclic butylene terephthalate and its composites via ring-opening polymerization

Journal of Thermoplastic Composite Materials ◽

10.1177/0892705717697774 ◽

2017 ◽

Vol 31 (2) ◽

pp. 181-201 ◽

Cited By ~ 2

Author(s):

Chun Yan ◽

Ling Liu ◽

Yingdan Zhu ◽

Haibing Xu ◽

Dong Liu

Keyword(s):

Mechanical Properties ◽

Ring Opening ◽

Ring Opening Polymerization ◽

Degree Of Crystallinity ◽

Resin Matrix ◽

Polymerization Temperature ◽

Butylene Terephthalate ◽

Cyclic Butylene Terephthalate ◽

Electron Microscopy Analysis ◽

Interlaminar Shear

Continuous glass fiber (GF)-reinforced polymerized cyclic butylene terephthalate (pCBT) composites were prepared via vacuum-assisted resin transfer molding using butyltin tris(2-ethylhexanoate) as the catalyst. The relationship between melt viscosity and polymerization time was examined in the ring-opening polymerization of CBT resin. The effects of polymerization conditions such as catalyst content and polymerization temperature on viscosity average molar mass ( Mv), crystallization, mechanical properties, and microstructure of GF/pCBT composites were also investigated in detail. It is found that both high molecular weight and high degree of crystallinity of resin matrix can lead to high mechanical properties of composites. The composites prepared with 0.5% catalyst at 190°C show the best mechanical properties with tensile strength of 549 MPa, flexural strength of 585.2 MPa, and interlaminar shear strength of 47.1 MPa. The scanning electron microscopy analysis also demonstrates that good interfacial adhesion exists between fiber and resin, which agrees very well with experimental results.

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Synchronous architecture of ring-banded and non-ring-banded morphology within one spherulite based on in situ ring-opening polymerization of cyclic butylene terephthalate oligomers

RSC Advances ◽

10.1039/c6ra20471f ◽

2016 ◽

Vol 6 (97) ◽

pp. 94524-94530 ◽

Cited By ~ 7

Author(s):

Jianqiang Zhang ◽

Li Li ◽

Senyang Song ◽

Huixia Feng ◽

Peng Chen ◽

...

Keyword(s):

Ring Opening ◽

Ring Opening Polymerization ◽

Butylene Terephthalate ◽

Cyclic Butylene Terephthalate

Ring-banded morphology of pCBT accompanied by the synchronous evolution of non-ring-banded patterns was investigated through the crystallization of pCBT prepared by ROP of CBT.

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