Yes, I am referring to research that was carried out years ago concerning the complementarity of various fibres.
In essence, at a subatomic level, all fibres have their own electronic field. Similar fibres can be woven together without disturbing this field, whereas fabrics which blend unlike fibres having differing electronic fields disturb this pattern. This will manifest itself in the form of excessive wear, misalignment of fibres, and even a sensation of discomfort in the wearer of such fabrics.
It is not research that I personally was involved in, but I am prepared to accept the findings at face value as they happen to coincide with my own preconceptions - just as I am prepared to accept, without having personally investigated the matter, that the Earth is round and not flat. I do not wish to prevent others from experimenting with whatever mixtures of fibres they deem advisable, although my own advice would be to avoid combinations of natural fibres and synthetic substances, such as cotton and polyester.
I am unclear why you think I should not be giving advice to forum members - almost every other posting here seems to be giving advice on this or that, often with far less justification than I have just provided here. Finding my statements 'vague' or 'suspect' may not be a bad starting point, but by all means do your own investigations into the subject too and then you too may be able to contribute something to the discussion.
You are referring to research that you have seen not that you have directly contributed to. In other words, you have no qualifications to come to the conclusions you proffered. Now, if you had said that you read in X book that Y research was true, your conclusion might be somewhat justified.
Listen, I told you that is not personal, but I think giving advice on the basis of hearsay actually takes away from the conversation. If we are having a conversation about molecular biology, and someone comes in to the conversation and says "You know, I read that all anaerobic cells do not use the Krebs Cycle to generate energy," a little research would uncover that statement to be absolutely false. We could also agree that that statement would take away from the general scientific discourse, first, because it is false, second, because people have to correct the false statement, and third, and worst of all, people who are listening to you and taking your advice as fact now have false information. Likewise, because you have neither sufficiently explained the science behind what makes a "mongrel" fiber nor offered your own experience indicating that such fabric is indeed inferior, you literally have no basis on which to make that conclusion.
You say I take away from the conversation; let me ask you which is worse, making a definitive proclamation without basis to an impressionable group of people seeking answers, or questioning whether someone is indeed qualified to make a definitive statement on a topic.
The reason why I pointed this out is because this is often what happens on StyleForum. Incredible theories get started about different sartorial subjects and people offer their opinions on them-only they are not their opinions, the speakers are merely acting as proxies on behalf of original speakers. Just like we do not and should not allow hearsay in the court system, people should have either direct or expert knowledge before making a claim...especially when that claim is in response to a question asked, as is the case here.
Lastly, your explanation is patently ridiculous. Your argument reads, in essence, 1.) all fibers have electronic fields at the atomic level, 2.) similar fabrics have similar electronic fields 3.) the components fibers of blended fabrics have have different electronic fields, 4.) blended fabrics' fields will disturb this pattern (pattern?! what pattern?! ), 5.) conclusion, therefore blended fabrics degrade faster.
If we are speaking chemistry here, you have neglected to explain about 50 necessary steps in the whole chemical reaction that could lead to this result and any high school debater would tear this logical sequence to bits. Contributions like this are a disservice to members on here who are genuinely seeking scientific or personal anecdotal answers. I would have had no problem if you had said, "I had a blended fabric coat, and it fell apart after 15 wears," but that's not what you said. You made a proclamation on the basis of reading something else...the science of which you have failed to prove that you can adequately explain and also cannot seem to cite.
This applies to you, me, and anyone else on here, that unless you have direct or expert knowledge about a subject, you should not offer your advice.
Man, I love tweed!