How much can the value of the glass transition temperature of a polymer synthesized by anionic means fluctuate?

08 November 2023 1 3K Report

The glass transition temperature of a polymer can vary from one experiment to another based on the parameters used in the synthesis and the synthesis route. I would like to know how much this oscillation range is. Sludos

James E Hanson

Tg depends on the MW (Mn to be exact). This is called the Flory-Fox equation. There is a limiting value of Tg as Mn increases.

A few other parameters (branching, etc) may also effect the Tg.

Could someone please provide a list of journals that accept the application of methodologies in nature-based solutions?

I am looking for journals that admit the publication of results from applying the IUCN Standard for designing and monitoring Nature-based solutions. Many thanks for considering my request.

23 July 2024 6,444 2 View

About mineral exploration?

Are there any techniques at ore exploration that could replace the compass-tape measure of mineralized structures?

14 June 2024 3,254 2 View

What is the minimum amount of liquid and beads I can use for bead-beating in a 2ml vial?

I am planning to extract DNA with QIAamp Mini DNA extraction kit (Qiagen) from DNA Shield microbiome preserved samples. My samples contain small amount of cell, so my goal is to reduce the loss of...

14 May 2024 2,291 2 View

Can I replace some of the buffers from the first steps of QIAamp Mini kit by DNAshield?

I am planning to extract DNA with QIAamp Mini DNA extraction kit (Qiagen) from DNA Shield microbiome preserved samples. My samples contain small amount of cell, so my goal is to reduce the loss of...

14 May 2024 7,178 3 View

How do I measure the virulence intensity of a fungus strain in a host plant?

I need to determinate how virulent is a fungus/oomycete strain-specie in comparative with others. I have plants group with and without fungus symptoms. However I found the fungus sources in both...

06 May 2024 8,974 5 View

¿How can I publish a book chapter without payment?

I almost finished a book chapter about my resent research (modeling of solid biomass combustion using OpenFOAM) and I want to publish it. In the case of a paper the procedure consists of sending...

26 February 2024 2,352 6 View

Application of pulsed light?

What are applications of pulsed light on produce?

19 February 2024 7,686 0 View

Ranges of psychiatric evaluation scales?

What are the ranges of the scales: Social Functioning Scale (SFS): to measure social functioning BPRS (18 items) and BPRS-E (extended version, 24 items): schizophrenia symptoms PANSS:...

27 January 2024 2,960 3 View

I am trying to detect a secreted protein by Western blot, Does Any of you have experimented some problems identifying secreted proteins by WB?

I am trying to detect a secreted protein by Western blot in plan tissue. To this aim, we are using a simple protein extraction protocol based on TX-100 and DTT. Then, I am loading the samples in a...

14 January 2024 1,647 4 View

Best way to fit mosquito incidence model with future climate data?

I have tried with no avail to make a logistic regression and random forest model work. First i fitted a model with climatic measurements as independent variables (2015-2020, almost five years)...

10 January 2024 9,738 1 View

Fabrication of narrow glass capillary (inner diameter 200~500 nm)?

I need a very narrow glass capillary for my research. How can I make a glass capillary with an inner diameter of around 200 to 500 nanometers?

08 August 2024 8,915 0 View

RNA later for the preservation of RNA in fecal samples at room temperature for one day (37°C)?

I am planning to collect human fecal samples for metatranscriptomic analysis using MGI. These samples are from indigenous people living in a region with high temperatures. I will have access to a...

06 August 2024 1,367 3 View

How to understand this crystallographic phenomenon of low temperature crystals in zeolite?

During low-temperature testing, new diffraction peaks that appear could be indicative of several phenomena. In one of our tests, we observed notable new peaks around 40° and 45° in a specific...

06 August 2024 726 3 View

Where can I find free research instruments for Nursing?

for eg. transition shock scale

01 August 2024 5,998 0 View

Is it possible to improve the reforming section of the Haber-Bosch process without using air separation units?

A typical reforming section in a large-scale Haber-Bosch process (Figure 1) comprises two reactors. A mixture of methane (CH4) and steam (H2O) is fed into a primary reformer to produce syngas via...

01 August 2024 7,051 5 View

Why my gel electrophoresis has smearing?

Greetings. I’m currently running a nested pcr for giardia. My mastermix comprised of 3mM Mgcl2, 5unit of taq polymerase, 0.2uM of forward and reverse primers each respectively and 0.2mM of dNtp...

22 July 2024 9,761 5 View

Is it possible to calculate finite numerical integration via matrix mechanics?

We assume that it is possible to calculate finite numerical integration via statistical matrix mechanics (a product of the statistical method of Cairo techniques). It is obvious that here it is...

21 July 2024 6,809 5 View

Appearance of crystallization peak in heating cycle of DSC test?

For which types of polymers, the crystallization peak in heating cycle of DSC test can be observed and for which types cant? In another word, when this exothermic crystallization can be observed...

18 July 2024 348 3 View

Does the potentiostat have to be in a fume hood when polymerising the PANI?

I will polymerise Aniline on ITO glass WE, using 1M of H2SO4 and a potentiostat. However, I am not sure if I have to do the electrochemical polymerisation inside a hood. Is it necessary? Is the...

10 July 2024 2,937 3 View

Would anyone care to recommend an inexpensive waterproof serviceable (e.g., batteries can be changed) temperature logger?

I've been using Hobo pendants for years but they are up from less than $50 a few years ago to over $100, and I'm in need of an alternative.

08 July 2024 7,164 1 View