solid state polycondensation second hand
Solid state polymerization
Solid State Polymerization (SSP) may be applied with polycondensation polymers, e.g. polyamides and polyesters, in order to increase the degree of …
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Polycondensation 2024
Pr. Christine Luscombe (Okinawa Institute of Science and Technology-OIST- Japan) : "Controlling polycondensation reactions: A case study in semiconducting polymer synthesis".. Pr. Timothy Long (Arizona State University, Arizona - USA) : "3D High Performance Engineering Polymers: From Aliphatic Polyesters to Aromatic Polyimides".. …
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Solid state polymerization of poly(lactic acid): Some …
An efficient solid-state polycondensation method for synthesizing stereocomplexed poly(lactic acid)s with high molecular weight
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SOLID STATE POLYCONDENSATION (SSP) OF PET RECYCLE…
solid state polycondensation (ssp) on recycled pet regrinds If we move the polycondensation reaction before extrusion (F4 - MODEL MOBY), the material is progressively heated until melting and ...
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Synthesis of poly(glycolic acids) via solution polycondensation …
Details are summarized in Table 1. For SSP (solid-state polycondensation) we prepared prepolymer at 180 oC, with optimum crystallite size and crystallinity based on previously XRD results. ... on the other end [8]. On the other hand, in case of direct polycondensation of glycolic acid, polymer chain would have hydroxyl group and …
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Solid State Polycondensation | Request PDF
The term solid state polycondensation simply says that chain growth by condensation steps occur under conditions, where at least one reaction partner exists in the solid state.
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Solid State Polycondensation
The term solid state polycondensation simply says that chain growth by condensation steps occur under conditions, where at least one reaction partner exists in the solid state. As discussed below, SSP encompasses a broad variety of …
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Solid-state polyamidation of unsaturated nylon salts: the …
(Keywords: unsaturated nylon salts; solid-state polycondensation (polyamidation); solid-melt transition; water accumulation) INTRODUCTION Solid-state polyamidation (SSP) is widely used in postpolymerizing nylon prepolymers produced in the melt phasel-S. ... On the other hand, separation of water in a second phase was not …
ادامه مطلبInfluence of decomposition temperature of aromatic sulfonic …
This melt polycondensate was then heat treated at 105°C for 2 h and subjected to solid-state polycondensation under various conditions to obtain a high-molecular-weight polymer of poly(L-lactic ...
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A review on synthesis and biomedical applications of …
Takahashi and colleagues used the melt/solid state polycondensation method of glycolic acid to obtain high molecular weight ... 2 ·2H 2 O was used as catalysis in the second step of this study. Surprisingly, polymer having a molecular weight of approximately M n ∼ ... On the other hand, the insolubility in many common solvents ...
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FUNDAMENTALS OF SOLID STATE POLYMERIZATION …
1.3. Solid state polymerization of step-growth polymers (solid state polycondensation) 14 1.3.1. Monomer solid state polymerization (direct SSP) 16 1.3.2. Prepolymer solid state polymerization (post-SSP, solid state finishing) 21 1.4. Solid state polymerization apparatus and assemblies 26 1.5. Solid state applications in the polymer industry ...
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Modeling of solid‐state polycondensation. II. Reactor …
The relative merits of the moving packed bed, fluidized bed, and stirred bed reactors for solid-state polycondensation are discussed along with methods for improving these designs. A general model to describe continuous solid-state polymerization reactors is then developed and illustrated by a case study of a moving packed bed reactor …
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Effect of solid-state polymerization on the structure and …
For this reason, additional procedures such as solid state polycondensation (SSP) and chain extension (CE) reaching MW ranging from 80,000 up to 250,000 g/mol are extensively investigated here ...
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Modification of poly (ethylene terephthalate) by …
Abstract The global environmental issues caused by plastic incineration are continuously increasing, along with the demand for polyethylene terephthalate (PET)—27 million metric tons of PET was…
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Solid-state polycondensation of poly(ethylene …
Melt solid polycondensation is an approach to increase the molecular weight of poly (L‐lactic acid) (PLLA). For this report, the effect of crystallization time of PLLA prepolymer on the molecular…
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Effect of solid-state polycondensation on crystalline …
Chain extender additives [10–12], melt-phase polycondensation [13–15], or solid-state polycondensation (SSP) processes [16–18] can be applied. They can be built into the different steps of recycling process; therefore, material production cost increases only to a small extent, while IV increases significantly.
ادامه مطلبSolid-State Polymerization of Poly(ethylene furanoate) …
In this work, we report the synthesis of poly (ethylene furanoate) (PEF), catalyzed by three different catalysts, namely, titanium (IV) isopropoxide (TIS), tetrabutyltitanate (TBT), and …
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The Solid State Postcondensation of PET, 2
A process for the solid state polycondensation of PET is proposed. It is shown that by correctly choosing the prepolymerisation conditions it is possible to crystallise the product and to directly ...
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New Aspects on the Direct Solid State Polycondensation …
The direct solid state polymerization (DSSP) of hexamethylene diammonium dodecanoate (PA 612 salt) was investigated for two different salt grades, fossil-based and bio-based. Aliphatic polyamide salts (such as PA 612 salt) are highly susceptible to
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Effect of antimony catalyst on solid-state polycondensation …
Duh [13] postulated that part of the functional end groups remains inactive during SSP and the solid-state polycondensation (transesterification) follows a second-order kinetics with respect to the active end group concentration. Thus, − d C d t =2k(C−C i) where C i is the inactive end group concentration. This model is capable of ...
ادامه مطلبPET bottle recycling solution from a single source
In addition to mechanical processing of used PET bottles, the recycling system encompasses all process steps leading up to extrusion with a ZSK twin screw extruder, …
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SOLID-PHASE POLYCONDENSATION OF POLYETHYLENE …
It has been experimentally confirmed that polyethylene terephthalate during its processing into products destruct without carrying out the process of solid-phase polycondensation. The conditions for both primary and secondary polyethylene terephthalate have been determined for carrying out the pr...
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New Aspects on the Direct Solid State Polycondensation …
1. Introduction. The direct solid state polymerization (DSSP) of polyamide salts has been systematically investigated in our laboratory since the late 1970s [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30].DSSP involves heating the solid reacting mass at a temperature below its melting point and …
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Newly Developed Techniques on Polycondensation, Ring …
Four synthesis methods, direct polycondensation (DP), azeotropic polycondensation (AP), solid state polymerization (SSP) and ring-opening …
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Shape-Anisotropic Polyimide Particles by Solid-State Polycondensation
Despite the wealth of accessible shapes of inorganic particles, anisotropic homopolymer particles are to date mostly limited to objects derived from spheres (e.g., ellipsoidal or disk-shaped particles). Here, we report the synthesis of shape-anisotropic, angular polyimide particles by thermal solid-state polycondensation (SSP) of …
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Solid-state polycondensation of poly(ethylene terephthalate…
The influence of N 2 flow rate on the M ¯ n of PET for 15 h at different temperatures is shown in Fig. 1.The M ¯ n of PET after SSP for 15 h at various temperatures increases with the increase in N 2 flow rate up to a plateau about 15 m/min. Although, Tang et al. [8] used L/min kg PET as the unit for measuring N 2 flow rate, it …
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Kinetics Comparison of Solid-State Polycondensation and …
This research delves into the kinetics of solid-state polycondensation (SSP) and melt postpolycondensation (MPP) of polyamide 6, with a particular focus on managing extractable content. We scrutinize how reaction time and temperature influence key properties, such as relative viscosity, oligomer content, and end group content in …
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The Solid State Postcondensation of PET, 2
A process for the solid state polycondensation of PET is proposed. It is shown that by correctly choosing the prepolymerisation conditions it is possible to crystallise the product and to...
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Solid‐state polymerization and bulk crystallization behavior …
The main variables involved in solid-state polymerization of PET homopolymers, originally with molecular weight within the commercial range, were sequentially studied to determine their influence ...
ادامه مطلبSolid-state polycondensation (SSP) as a method to obtain …
Solid-state polycondensation (SSP) is a competitive method of semicrystalline polymers synthesis to conventional melt polycondensation process.
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