Fine structure formation and physical properties of poly(butylene terephthalate) fibres in high-speed melt spinning

e-Polymers ◽  
2003 ◽  
Vol 3 (1) ◽  
Author(s):  
Hee Lee Sun ◽  
Hou Kim Kyoung ◽  
Kikutani Takeshi ◽  
Hok Cho Hyun
Keyword(s):  
Fine Structure ◽  
Physical Properties ◽  
Structure Formation ◽  
High Speed ◽  
Melt Spinning ◽  
Mechanical Analysis ◽  
Scanning Calorimetry ◽  
Butylene Terephthalate ◽  
Initial Modulus ◽  
Higher Temperature

Abstract Poly(butylene terephthalate) (PBT) fibres were obtained by high-speed melt spinning up to a take-up velocity of 8 km/min. Fine structure formation and physical properties of these fibres were investigated. The increase of take-up velocity caused raises in both density and birefringence. In wide-angle X-ray diffraction equatorial profiles, the increase of take-up velocity can be observed in the (010) and (100) reflections of β-crystals; the reflection peaks are the sharpest at a take-up velocity of 6 km/min. The initial modulus of the fibres arises when the fraction of β-crystals is increased, while the tenacity depends more on the fraction of α-crystals, i.e., the total crystallinity. Thermal properties of high-speed spun PBT fibres were measured with differential scanning calorimetry, dynamic mechanical and thermo-mechanical analysis, etc. Endothermic curves become sharper with increasing take-up velocity, and endothermic melting peaks are shifted to higher temperature. Crystal structures are well developed in fibres obtained at higher take-up velocities. The tan δ peaks of PBT fibres tend to shift to higher temperature and the peak intensity is decreased with increasing take-up velocity, i.e., the packing density of PBT fibres is high when the take-up velocity and thus the orientation of amorphous regions is increased. The shrinkage has a tendency to decrease with increasing take-up velocity.

Novel shape-memory polyurethane fibers for textile applications

2018 ◽  
Vol 89 (6) ◽  
pp. 1027-1037 ◽  
Author(s):  
Míriam Sáenz-Pérez ◽  
Tariq Bashir ◽  
José Manuel Laza ◽  
Jorge García-Barrasa ◽  
José Luis Vilas ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Shape Memory ◽  
Tensile Testing ◽  
Melt Spinning ◽  
Mechanical Analysis ◽  
Knitted Fabric ◽  
Scanning Calorimetry ◽  
Moisture Management ◽  
Potential Applications ◽  
Shape Memory Polyurethane

In this work, thermoresponsive shape-memory polyurethane (SMPU) fibers were produced by melt spinning from different SMPU pellets. Afterwards, the knitted fabric samples were prepared by the obtained fibers. Some of the SMPUs used were synthesized previously in our laboratory whereas a commercial one, named DIAPLEX MM4520, was also evaluated in order to carry out comparative studies. All the SMPUs were characterized by different techniques, such as thermogravimetric analysis, differential scanning calorimetry, dynamic mechanical analysis and tensile testing. Moreover, the shape-memory capabilities of the fabrics were measured by thermo-mechanical analysis. The obtained results show that the synthesized SMPUs could be attractive candidates for potential applications such as breathable fabrics or moisture-management textiles.

Preparation and Characterization of Multiwalled Carbon Nanotubes-Reinforced pCBT by Ring-Opening Polymerization of Cyclic Butylene Terephthalate

2016 ◽  
Vol 848 ◽  
pp. 125-131
Author(s):  
Yin He Su ◽  
Jun Rong Yu
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Scanning Calorimetry ◽  
Multiwalled Carbon ◽  
Butylene Terephthalate ◽  
Cyclic Butylene Terephthalate ◽  
The Matrix ◽  
Higher Temperature

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.

Fiber Structure Formation in High-speed Melt Spinning of Sheath-Core Type Bicomponent Fibers.

1995 ◽  
Vol 51 (9) ◽  
pp. 408-415 ◽  
Author(s):  
Takeshi Kikutani ◽  
Sadaaki Arikawa ◽  
Akira Takaku ◽  
Norimasa Okui
Keyword(s):  
Structure Formation ◽  
High Speed ◽  
Melt Spinning ◽  
Fiber Structure ◽  
Bicomponent Fibers

A green method to fabricate porous polypropylene fibers: development toward textile products and mechanical evaluation

2019 ◽  
Vol 90 (5-6) ◽  
pp. 547-560 ◽  
Author(s):  
Xiang Yan ◽  
Aurélie Cayla ◽  
Fabien Salaün ◽  
Eric Devaux ◽  
Pengqing Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Melt Spinning ◽  
Weight Ratio ◽  
Mechanical Analysis ◽  
Water Soluble ◽  
Drawing Ratio ◽  
Scanning Calorimetry ◽  
Excellent Thermal Stability ◽  
Crystallization Behaviors ◽  
Spinning Process

In this study, a series of immiscible polymer blend fibers with polypropylene (PP) and polyvinyl alcohol (PVA) was obtained by a melt spinning process, and two different draw ratios were attempted. Efforts were made to obtain the porous PP fibers by removing the water-soluble PVA phase. The thermal properties of the blends were tested by thermogravimetric analysis and differential scanning calorimetry. The blends showed excellent thermal stability and differentiated fractionated crystallization behaviors of PP. The melt flow indexes of the blends were evaluated, exhibiting a higher fluidity than that of the neat polymers. Among the possible candidates for the spinning process, only the PP70–PVA30 had suitable spinnability, for which the draw ratio reached 3. The morphology of the fibers was investigated by selective extraction experiment and scanning electron microscopy, as well as wide-angle X-ray diffraction. The biphasic morphology and the crystallization behaviors varied according to the PVA content. Furthermore, the mechanical properties of the multifilament fibers were studied via tensile testing and dynamical mechanical analysis. The 70/30 weight ratio (PP/PVA) was the most suitable for producing biphasic fibers with a high degree of accessibility in PVA and mechanical properties that increase with the increase in the drawing ratio. The feasibility of fabric knitting was checked, and the mechanical properties and air permeability of the obtained textile structure were also evaluated.

A detailed characterization of sandalwood-filled high-density polyethylene composites

2020 ◽  
pp. 089270572093915
Author(s):  
Metehan Atagür ◽  
Nusret Kaya ◽  
Tuğçe Uysalman ◽  
Cenk Durmuşkahya ◽  
Mehmet Sarikanat ◽  
...  
Keyword(s):  
High Density Polyethylene ◽  
High Speed ◽  
Loss Modulus ◽  
Weight Fraction ◽  
Mechanical Analysis ◽  
High Density ◽  
Scanning Calorimetry ◽  
Detailed Characterization ◽  
Three Point Bending

In this study, the performance of sandalwood (SW), as an efficient potential filler material for high-density polyethylene (HDPE), was investigated in detail. Firstly, the characterization of SW was conducted by the determination of chemical composition with chemical and thermal analysis methods. The distribution of SW particles, which were used in composite fabrication, was obtained by using a dynamic light scattering analyzer. Then, the composites of SW, whose weight fractions varied from 5% to 20%, with HDPE were produced in a high-speed thermokinetic mixer. The detailed characterization of composites was made by using thermogravimetric analysis, scanning electron microscopy, X-ray diffraction analysis, differential scanning calorimetry, dynamic mechanical analysis (DMA), Fourier transform infrared, thermal conductivity measurements, and tensile and three-point bending tests. From DMA, storage modulus and loss modulus values of the HDPE matrix increased with increasing the weight fraction of SW. It is clearly seen that SW incorporation into HDPE at weight fractions of 5% and 20% exhibited the best improvement in terms of tensile and flexural strengths, respectively. It can be noted that the reinforcement effect of SW for HDPE is more prominent at high temperatures.

Fine structure and physical properties of poly(butylene terephthalate) sheets prepared by roll drawing

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Sunhee Lee ◽  
Kazuo Nakayama ◽  
Hyunhok Cho
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Fine Structure ◽  
Physical Properties ◽  
Molecular Orientation ◽  
Thermal And Mechanical Properties ◽  
Butylene Terephthalate ◽  
Orientation Effects ◽  
Axial Form ◽  
Drawing Method

AbstractPBT sheets were extruded from T-die using a single extruder and were winded by a take-up roller controlled at 50°C and with speed at 1.2 m/min. Oriented PBT sheets were prepared with various winding roll speeds at 3.6, 4.8 and 6.0 m/min. Fine structure and physical properties of PBT sheets thus obtained were investigated by measuring the molecular orientation, crystal structure, dynamic visco-elasticity, thermal and mechanical properties, sonic modulus, etc. PBT melts were found to be readily crystallizable in the sheet. In the case of roll drawing, the DRmax of PBT sheet was 5. The PBT sheets prepared from winding speed at 6 m/min showed polymorphism of both α- and β-form crystallites with crystallinity of about 24%. In the tri-directional WAXD patterns, the PBT sheets by the roll drawing method turned out to be oriented in the uniplanar-axial form. For the roll drawn PBT sheets with various winding speeds, large orientation effects were observed in the winding direction together with improved thermal and mechanical properties.

scholarly journals FIBER STRUCTURE FORMATION IN HIGH SPEED MELT SPINNING OF POLY (ETHYLENETEREPHTHALATE)

1984 ◽  
Vol 40 (2) ◽  
pp. T63-T71 ◽  
Author(s):  
Jiro Shimizu ◽  
Takeshi Kikutani ◽  
Akira Takaku ◽  
Norimase Okui
Keyword(s):  
Structure Formation ◽  
High Speed ◽  
Melt Spinning ◽  
Fiber Structure

Thermal Characterization of a Microlayered Polycarbonate/Polymethyl Methacrylate Composite

1996 ◽  
Vol 461 ◽  
Author(s):  
Alex J. Hsieh ◽  
Alex W. Gutierrez
Keyword(s):  
Glass Transition ◽  
Polymethyl Methacrylate ◽  
High Speed ◽  
Thermal Characterization ◽  
Mechanical Analysis ◽  
Transition Temperatures ◽  
Scanning Calorimetry ◽  
Glass Transition Temperatures ◽  
High Speed Impact ◽  
The Individual

ABSTRACTThermal behavior of a coextruded microlayer composite with 388 alternating layers of polycarbonate and polymethyl methacrylate (PMMA) was investigated using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). Two distinct glass transition temperatures were observed with DSC for the coextruded composite, however both were shifted very slightly towards each other, compared to the glass transition temperatures of the pure components, indicating limited miscibility. Adhesion between the alternating microlayers appeared to be very good; delamination did not occur after the microlayer composite was subjected to a high speed impact test. Adhesion is attributed to limited miscibility since little mixing resulted from the laminar flow which was required in the coextrusion process. DMA results revealed an additional damping peak, which was not observed with DSC, at a temperature between the glass transitions of the two components. This intermediate transition peak is more sensitive to change in frequency compared to the response for the individual pure components.

scholarly journals Effect of Aromatic Petroleum Resin on Damping Properties of Polybutyl Methacrylate

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 543
Author(s):  
Songhan Wan ◽  
Saisai Zhou ◽  
Xing Huang ◽  
Songbo Chen ◽  
Shuwei Cai ◽  
...  
Keyword(s):  
Mechanical Analysis ◽  
Damping Properties ◽  
Scanning Calorimetry ◽  
Sem Images ◽  
Dynamical Mechanical Analysis ◽  
Petroleum Resin ◽  
The Matrix ◽  
Higher Temperature ◽  
Dsc Curves ◽  
Positive Effect

The damping properties of polybutyl methacrylate (PBMA)/aromatic petroleum resin (C9) composite were investigated in this work. In particular, a trace of styrene (St) was introduced to copolymerize with PBMA to improve the compatibility between C9 and matrix. The structure of the copolymer, P(BMA-co-St), was characterized by FTIR and 1HNMR. The P(BMA-co-St)/C9 composites were tested by differencial scanning calorimetry (DSC), scanning electron microscopy (SEM) and dynamical mechanical analysis (DMA). DSC curves of all P(BMA-co-1wt%St)/C9 composites expressed only one glass transition temperature (Tg). SEM images showed that C9 had good compatibility with the matrix after St was introduced. DMA curves indicated that the addition of C9 had a positive effect on the damping properties of PBMA. The loss tangent (tanδ) peak moved to a higher temperature with the increment content of C9, and the effective damping temperature range increased significantly. The influence of aromatic resin C9 and aliphatic resin (C5) on PBMA damping performance was compared. It was further shown that C9 with benzene ring effectively improved the damping performance of PBMA.

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