Melting and crystallization behavior of copolymer from cyclic butylene terephthalate and polycaprolactone

In this study, PP/clay nanocomposites have been fabricated at different nanoclay loadings, i.e. 0, 5, 10, and 5 wt% for the 1stcycle and 2ndcycle (re-processing). The prepared nanocomposites were then characterized by a Differential Scanning Calorimetry (DSC) to investigate the effects of nanoclay loadings and re-processing on the melting and crystallization of the nanocomposites. The DSC results showed that the melting temperature,Tmwas not significantly affected by the nanoclay loadings and re-processing. In the other hand, the degree of crystallinity,Xcof the nanocomposites was higher than that of neat PP, but only reached a maximum at nanoclay loading of 5 wt% (i.e. 51.2% for NC-5-I and 48.3% for NC-5-II). Thereafter, theXcdecreased at higher nanoclay loadings. There was no significant difference inXcbetween 1stcycle and 2ndcycle. Additionally, in all nanocomposites samples for both cycles, there were two crystallization temperatures, i.e.Tc1andTc2. In the overall crystallization process, theTcof nanocomposites increased by 11-12°C compared to that of neat PP. Whereas, the onset crystallization temperature,Tocalso increased by approx. 13°C. Apparently, there was no significant effect of nanoclay loadings and re-processing on theTcndTocof the nanocomposites.

Download Full-text

Hybrid multi-scale thermoplastic composites reinforced with interleaved nanofiber mats using in-situ polymerization of cyclic butylene terephthalate

Composites Communications ◽

10.1016/j.coco.2019.01.005 ◽

2019 ◽

Vol 12 ◽

pp. 91-97 ◽

Cited By ~ 4

Author(s):

Yong Zhao ◽

Xiaojing Ma ◽

Tao Xu ◽

David R. Salem ◽

Hao Fong

Keyword(s):

In Situ Polymerization ◽

Thermoplastic Composites ◽

Butylene Terephthalate ◽

Multi Scale ◽

Cyclic Butylene Terephthalate ◽

Nanofiber Mats

Download Full-text

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

Journal of Composites Science ◽

10.3390/jcs4040146 ◽

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.

Download Full-text

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.813.278 ◽

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.

Download Full-text

Crystallization Behavior of Polypropylene/Syndiotactic1,2-Polybutadiene Blends

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.531-532.182 ◽

2012 ◽

Vol 531-532 ◽

pp. 182-185

Author(s):

Xiao Feng He ◽

Shuai Wang ◽

Tie Jun Ge ◽

Xue Quan Zhang ◽

Chun Yu Zhang

Keyword(s):

High Temperature ◽

Melting Temperature ◽

Crystallization Temperature ◽

Crystallization Behavior ◽

Strong Impact ◽

Crystallization Behaviors ◽

Supercooling Temperature ◽

Melting And Crystallization

The melting and crystallization behaviors of Polypropylene/Syndiotactic1,2-polybutadiene (PP/s-PB) blends and neat PP were studied by using DSC, the results showed that the presence of s-PB in PP would have a strong impact on the crystallization capacity of PP. The presence of s-PB in PP could increase the crystallization temperature(Tc) of PP, and the s-PB could obviously lower supercooling temperature(Tm-Tc) of PP, but the s-PB in PP have a Slightly influence on the melting temperature(Tm) of PP. The proposed reason for those are that the crosslinking s-PB in high temperature is a nucleator for PP’s crystallization and increases PP’s crystalline rate. However, the s-PB lowers PP’s crystallinity. At the same time, the presence of PP in blends lowers s-PB’s crystallinity, but the PP in blends have a Slightly influence on the melting temperature(Tm) and crystallization temperature(Tc) of s-PB.

Download Full-text

Novel conductive polymer composites based on poly(butylene terephtalate) filled with carbon fibers

e-Polymers ◽

10.1515/epoly.2008.8.1.1794 ◽

2008 ◽

Vol 8 (1) ◽

Author(s):

Liubov Bardash ◽

Gisèle Boiteux ◽

Gérard Seytre ◽

Chady Hakme ◽

Nicolas Dargère ◽

...

Keyword(s):

Carbon Fibre ◽

Percolation Threshold ◽

Polymer Composites ◽

Carbon Fibers ◽

Conductive Polymer ◽

Processing Conditions ◽

Butylene Terephthalate ◽

Conductive Polymer Composites ◽

Cyclic Butylene Terephthalate ◽

Conducting Polymer Composites

AbstractPoly(butylene terephthalate) (cPBT) synthesized from cyclic Butylene Terephthalate oligomers (CBT) was used as a matrix for carbon fibre (CF) conducting polymer composites (CPC). DSC, rheological studies and measurements of torque of CBT/CF were performed in order to optimise the processing conditions of CPC. DC and AC measurements were carried out for these composites and have shown a low percolation threshold for cPBT/CF.

Download Full-text