In situ polymerization of thermoplastic composites based on cyclic oligomers

2004 ◽  
Vol 26 (1) ◽  
pp. 60-65 ◽  
Author(s):  
Hilde Parton ◽  
Ignaas Verpoest
Keyword(s):  
In Situ Polymerization ◽  
Thermoplastic Composites ◽  
Cyclic Oligomers

Mechanical Properties of Thermoplastic Composites via In Situ Polymerization from Cyclic Oligomers

2013 ◽  
Vol 750-752 ◽  
pp. 7-10
Author(s):  
Kou An Hao ◽  
Zhen Qing Wang ◽  
Li Min Zhou
Keyword(s):  
Mechanical Properties ◽  
In Situ Polymerization ◽  
High Viscosity ◽  
Thermoplastic Composites ◽  
Thermoplastic Matrix ◽  
Polymerization Catalyst ◽  
Short Beam ◽  
Beam Shear ◽  
Cyclic Oligomers

Fiber impregnation has been the main obstacle for thermoplastic matrix with high viscosity. This problem could be surmounted by adapting low viscous polymeric precursors Woven basalt fabric reinforced poly (butylenes terephthalate) composites were produced via in-situ polymerization at T=210°C. Before polymerization, catalyst was introduced to the reinforcement surface with different concentration. DSC is used to determine the polymerization and crystallization. SEM is used to detect whether the catalyst existed on surface. Both flexural and short-beam shear test are employed to study the corresponding mechanical properties.

ON THE CYCLO-DEPOLYMERIZATION OF ALKYL AROMATIC POLYESTERS AND THE IN SITU POLYMERIZATION OF THE CYCLIC OLIGOMERS PRODUCED

2008 ◽  
Author(s):  
M. Alessi ◽  
P. Stagnaro ◽  
L. Conzatti ◽  
S. Tagliatatela Scafati ◽  
P. Hodge ◽  
...  
Keyword(s):  
In Situ Polymerization ◽  
Cyclic Oligomers ◽  
Aromatic Polyesters

Preparation and Characterization of In Situ Polymerized Cyclic Butylene Terephthalate and its Composites

2015 ◽  
Vol 813 ◽  
pp. 258-264
Author(s):  
Lu Zhang ◽  
Li Min Zhou ◽  
Ji Feng Zhang ◽  
Bin Yang ◽  
Shao Hua Fan
Keyword(s):  
Mechanical Property ◽  
In Situ Polymerization ◽  
Thermoplastic Composites ◽  
Degree Of Crystallinity ◽  
Fiber Volume ◽  
Melt Viscosity ◽  
Butylene Terephthalate ◽  
Cyclic Butylene Terephthalate ◽  
The Matrix

A fatal disadvantage of continuously reinforced thermoplastic composites is the high melt viscosity of the matrix which hampers impregnation. However, the melt viscosity of low molecular weight CBT resin can reach extremely low value, which simplifies impregnation and enables the use of thermoset production methods. The thermal analysis, rheological analysis and mechanical property on the polymerization and crystallization of CBT into poly (cyclic butylene terephthalate) (PCBT) at different ratios of catalyst were investigated in this paper. The continuous glass fiber (GF) reinforced PCBT composite with over 70% fiber volume content was prepared via in situ polymerization, and the mechanical property of the PCBT was studied. The best impregnation time was decreased and the degree of crystallinity was increased respectively with catalyst fraction increasing. The tensile/flexural strength and modulus of PCBT resin and GF/PCBT composites were enhanced when the catalyst fraction increased from 0.3% to 0.6%.

Microencapsulation of Styrene/Epoxydiacrylate via In Situ Polymerization of Melamine-Formaldehyde

2011 ◽  
Vol 393-395 ◽  
pp. 1279-1282
Author(s):  
Hai Ping Wang
Keyword(s):  
In Situ Polymerization ◽  
Limited Range ◽  
Thermoplastic Composites ◽  
Resonance Spectroscopy ◽  
Self Healing ◽  
Melamine Formaldehyde ◽  
Core Content ◽  
Ft Ir ◽  
And Storage

Microcapsules containing the mixture of styrene and epoxydiacrylate (St/E51-AA) for use in self-healing thermoplastic composites were synthesized by in-situ polymerization using melamine-formaldehyde (MF) as shell materials. The microcapsules were prepared in two consecutive steps, emulsification of St/E51-AA in water and then, encapsulation. The chemical structure of microcapsule was identified by Fourier transform infrared spectroscopy (FT-IR) and proton magnetic resonance spectroscopy (1H-NMR), respectively. Morphology and shell wall thickness of microcapsule were observed using scanning electron microscope (SEM). The effect of dispersion rates, through a limited range, was carefully examined on the particle size and core content of microcapsules. It was found that styrene/ epoxydiacrylate-loaded microcapsules were successfully prepared through the proposed technical route, and their mean diameters fell in the range of 36~110 μm. Both core content and microcapsule size can be adjusted by selecting different dispersion rates. The highest loading of St/E51-AA in the resultant microcapsules can be about 85%. In terms of thermogravimetric analysis (TGA), thermal behavior and storage stability of the capsules were studied.

scholarly journals Interlayer bonding between thermoplastic composites and metals by in‐situ polymerization technique

2021 ◽  
pp. 51188
Author(s):  
Colin Robert ◽  
Dimitrios Mamalis ◽  
Winifred Obande ◽  
Vasileios Koutsos ◽  
Conchúr M. Ó Brádaigh ◽  
...  
Keyword(s):  
In Situ Polymerization ◽  
Thermoplastic Composites ◽  
Interlayer Bonding

scholarly journals Monomer Selection for In Situ Polymerization Infusion Manufacture of Natural-Fiber Reinforced Thermoplastic-Matrix Marine Composites

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2928
Author(s):  
Yang Qin ◽  
John Summerscales ◽  
Jasper Graham-Jones ◽  
Maozhou Meng ◽  
Richard Pemberton
Keyword(s):  
Mechanical Properties ◽  
Moisture Absorption ◽  
Natural Fiber ◽  
In Situ Polymerization ◽  
Synthetic Fiber ◽  
Thermoplastic Composites ◽  
Processing Temperature ◽  
Primary Focus ◽  
The Cost

Awareness of environmental issues has led to increasing interest from composite researchers in using “greener” materials to replace synthetic fiber reinforcements and petrochemical polymer matrices. Natural fiber bio-based thermoplastic composites could be an appropriate choice with advantages including reducing environmental impacts, using renewable resources and being recyclable. The choice of polymer matrix will significantly affect the cost, manufacturing process, mechanical properties and durability of the composite system. The criteria for appropriate monomers are based on the processing temperature and viscosity, polymer mechanical properties, recyclability, etc. This review considers the selection of thermoplastic monomers suitable for in situ polymerization during resin, now monomer, infusion under flexible tooling (RIFT, now MIFT), with a primary focus on marine composite applications. Given the systems currently available, methyl methacrylate (MMA) may be the most suitable monomer, especially for marine composites. MMA has low process temperatures, a long open window for infusion, and low moisture absorption. However, end-of-life recovery may be limited to matrix depolymerization. Bio-based MMA is likely to become commercially available in a few years. Polylactide (PLA) is an alternative infusible monomer, but the relatively high processing temperature may require expensive consumable materials and could compromise natural fiber properties.

Manufacture of Carbon Nanotube-Grafted Carbon Fiber Reinforced Thermoplastic Composites

2015 ◽  
Vol 651-653 ◽  
pp. 405-408
Author(s):  
Min Chang Sung ◽  
Geun Sung Lee ◽  
Seung Yong Lee ◽  
Seong Ik Jeon ◽  
Cheol Hee Ahn ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Carbon Fiber ◽  
In Situ Polymerization ◽  
Interfacial Properties ◽  
Polymer Nanoparticles ◽  
Thermoplastic Composites ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced

Carbon fiber reinforced composites (CFRCs) have been used in various high-end industries due to their outstanding specific mechanical properties. Recently, carbon nanotube (CNT)-grafted carbon fibers (CFs) made via direct growth has emerged as an advanced and hierarchical reinforcement that can improve the reinforcing effect of CFs in CFRCs. On the other hand, CF reinforced thermoplastic composites (CFRTPs) have attracted much attention because of their quick and mass production capability, e.g., which is important for automotive part manufacturing. Here, we report on the manufacture of CFRTPs using CNT-grafted CFs and their mechanical properties. First, the interfacial shear strength of CNT-grafted CFs with thermoplastic resins was characterized to demonstrate improved interfacial properties due to the CNTs grafted on CFs. Then, the composites were manufactured in two ways; polymer nanoparticles and in-situ polymerization. Polymer nanoparticles were used to improve the interfacial properties due to their small size and good mechanical locking with CF surfaces. In-situ polymerization was also used to manufacture CFRTPs, i.e., monomers with catalyst were transferred into CNT-grafted CF fabric preform using vacuum assisted resin transfer molding and then polymerized into solid matrix. This in-situ polymerization enabled the manufacture of CNT-grafted CF thermoplastic composites by overcoming the difficulties of filling the surface of CNT-grafted CFs with thermoplastic polymers. Finally, the mechanical, thermal, electrical, and damping properties of CNT-grafted CF thermoplastic composites were characterized and compared with their thermoset composites.

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