scholarly journals Effects of crystalline morphologies on the mechanical properties of carbon fiber reinforcing polymerized cyclic butylene terephthalate composites

2012 ◽  
Vol 6 (4) ◽  
pp. 318-328 ◽  
Author(s):  
T. Yu ◽  
C. M. Wu ◽  
C. Y. Chang ◽  
C. Y. Wang ◽  
S. P. Rwei
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Butylene Terephthalate ◽  
Cyclic Butylene Terephthalate

Electrical and Mechanical Properties of Short-Carbon-Fiber Reinforced Polymerized Cyclic Butylene Terephthalate Composites

2015 ◽  
Vol 813 ◽  
pp. 278-284
Author(s):  
Bin Yang ◽  
Ji Feng Zhang ◽  
Lu Zhang ◽  
Shao Hua Fan ◽  
Li Min Zhou
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Percolation Threshold ◽  
Bending Test ◽  
Material System ◽  
Melt Mixing ◽  
Butylene Terephthalate ◽  
Short Carbon Fiber ◽  
Cyclic Butylene Terephthalate ◽  
Short Carbon

Polymerized cyclic butylene terephthalate (pCBT) resin casts filled with short carbon fibers were prepared by the melt-mixing approach. The electrical conductivity of short-carbon-fiber (SCF) reinforced thermoplastic pCBT resin casts were investigated with a special attention paid to the properties in the percolation threshold region and the mechanical properties of the composites were also studied. The percolation threshold value of the novel material system was determined which was also verified by SEM images and the thermoelectric behavior of the specimens. Even though the electrical properties of SCF/pCBT composites enhanced significantly, the material becomes more brittle than neat pCBT and all the specimens appear brittle fracture during the mechanical test. Moreover, fiber pull-out is the main damage form in three-point-bending test.

scholarly journals An Innovative Approach for Restoring the Mechanical Properties of Thermoplastic-Matrix Nanocomposite by the Use of Partially Polymerized Cyclic Butylene Terephthalate

2020 ◽  
Vol 4 (4) ◽  
pp. 146
Author(s):  
Francesca Ferrari ◽  
Antonio Greco
Keyword(s):  
Mechanical Properties ◽  
Healing Process ◽  
Self Healing ◽  
Butylene Terephthalate ◽  
Thermoplastic Matrix ◽  
Damaged Zone ◽  
Cyclic Butylene Terephthalate ◽  
Flexural Tests ◽  
Activation Times ◽  
Matrix Nanocomposite

This work is focused on the production of a smart material from cyclic butylene-terephthalate (CBT), characterized by the built-in capability to recover its damage, through the catalyzed ring opening polymerization (ROP) of its oligomers; in particular, molten CBT, after filling the damaged zone, can be converted into poly-butylene terephthalate (PBT), thus promoting a join of the broken surfaces and fixing the crack. To obtain a material with self-healing potential, the production of a partially polymerized system is required. For this purpose, two solutions were studied: the first one involved the use of two catalysts with different activation times, whereas the second solution implied the intercalation of the faster catalyst inside the nanoclay lamellae. Since the intercalation allowed slowing the activation of the catalyst, residual CBT can be converted in a second step. Mechanical properties of partially reacted PBT samples and their healing ability were checked by flexural analyses; in order to promote the healing process, samples were notched to simulate partial damage and left in oven for different times and temperatures, to allow the activation of the unreacted catalyst with the consequent ROP of the residual CBT; flexural tests on samples after healing showed a good recovery of mechanical properties.

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

2017 ◽  
Vol 31 (2) ◽  
pp. 181-201 ◽  
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.

scholarly journals Effect of Cyclic Butylene Terephthalate Oligomer on the Properties of Styrene-Butadiene and Acrylonitrile-Butadiene Rubbers

2017 ◽  
Author(s):  
István Zoltán Halász ◽  
Tamás Bárány
Keyword(s):  
Mechanical Properties ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Butylene Terephthalate ◽  
Active Filler ◽  
Oil Resistance ◽  
Acrylonitrile Butadiene Rubber ◽  
Cyclic Butylene Terephthalate ◽  
Styrene Butadiene ◽  
Positive Effect

In this work the effect of cyclic butylene terephthalate (CBT) was studied on the curing, rheological, morphological and mechanical properties of styrene butadiene rubber (SBR), oil extended styrene butadiene rubber (oSBR), acrylonitrile butadiene rubbers (NBR) with various acrylonitrile (AN) content and a carboxylated acrylonitrile butadiene rubber (XNBR). The effect of CBT on the oil resistance of the NBR and XNBR based compounds was also investigated. Viscosities of the uncured compounds were significantly decreased by CBT and it also acted as a semi-active filler, effectively reinforcing the tested rubbers, therefore it is suggested to be a bifunctional additive for tested rubbers. CBT also showed to have a positive effect on the oil resistance of NBR compounds.

Styrene-Butadiene Rubber/Graphene Nanocomposites: Effect of Co-Milling with Cyclic Butylene-Terephthalate

2015 ◽  
Vol 812 ◽  
pp. 65-70
Author(s):  
István Halász ◽  
Tamás Bárány
Keyword(s):  
Mechanical Properties ◽  
Milling Process ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Sem Images ◽  
Graphene Nanocomposites ◽  
Butylene Terephthalate ◽  
Roll Mill ◽  
Cyclic Butylene Terephthalate ◽  
Styrene Butadiene

Graphene nanoplatelets (GnP) reinforced styrene-butadiene rubber (SBR) nanocomposites were produced by two different methods. For reference purpose carbon black (CB) reinforced formulations served. In the first method the components were mixed on a two roll open mill directly. In the second method, GnP was subjected to milling in an attritor mill together with cyclic butylene-terephthalate oligomer (CBT) powder prior to the mixing on two roll mill. Samples were cured in a hot press. The rubber sheets were characterized by tensile and tear tests, and their fracture surfaces inspected in scanning electron microscopy (SEM). Results showed that GnP outperformed CB with respect to reinforcing effect. Previous co-milling of GnP with CBT caused a slight decrease in mechanical properties. SEM images proved, that the co-milling process did not affect significantly the dispersion of GnP, its particles were shredded into smaller pieces, which caused the slight decrease in the mechanical properties.

Sign in / Sign up

Export Citation Format

Share Document