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w*****m
发帖数: 20421 | 2 Hevea wood应该是RUBBER WOOD橡胶树，比较软，是廉价木头，硬度值在900多，比
MAPLE还软 |
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c*****g
发帖数: 408 | 3 小鹿是100%橡胶制作的（Latex from the rubber tree HEVEA)，有气味是正常的吧。
不过对第三方卖家的确需要谨慎，尤其是一些暴利的东西，如小鹿，ergobaby背带等，
第三方卖家一大把一大把的，用户评论里面也总是能看到买到假货的。
我在amazon上买过小鹿，但拿到手就退了，因为刚开封就看到上面有黑手印，或许是别
人退过的。后来再也没买，要买的话，可能也会去BRU买，而不是在amazon。 |
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n*********e
发帖数: 25274 | 4 Today, the Dunlop brand and logo is used for these products:
Automobile
Dunlop Tyres and Dunlop Tires:
owned in Europe and North America by Dunlop Tyres, a joint venture 75% owned
by Goodyear and 25% by Sumitomo Rubber Industries (the result of a 1999
deal)
owned 100% by Goodyear in Australia (the result of deals in 1987 and 2006
with Dunlop Australia)
owned by Sumitomo in Asia (the result of the acquisition from Dunlop Rubber
in 1985)
owned in India by the Ruia Group (the result of the sale of ... 阅读全帖 |
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c**i
发帖数: 6973 | 5 (1) Alfred W Crosby, The Herald of a New Creation; In the century following
Columbus's voyage, most migrants to the New World were African, not European
. Wall Street Journal, Aug 9, 2011
http://online.wsj.com/article/SB10001424
053111904888304576472692264364406.html
(book review on Charles C Mann, 1493: Uncovering the New World Columbus
created. Knopf, 2011)
Note:
(a) "Genoa's most famous son" refers to Christopher Columbus (1451-1506;
born in Genoa, at modern Italy)
(b) dialectic (n; ultimatel... 阅读全帖 |
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t***m
发帖数: 114 | 6 The first polymers used were all obtained from natural products. Natural ru
bber from the Hevea trees was being used by the American Indians when Columb
us arrived in 1492. Cellulose in different forms, starch and collagen in lea
ther are other examples of native polymers. Modification of native polymers
started in the mid-nineteenth century and the first wholly synthetic polymer
was made in the beginning of the 20th century. The science of polymers bega
n in the 1920s.
The development of polyme |
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w********h
发帖数: 12367 | 7 Short polymer history
It is intended in this section to give only a very short presentation of the
development of polymer materials and ideas in polymer science in this section.
Morawetz (1985) and Rånby (1993) give a detailed presentation of this
field.
The first polymers used were all obtained from natural products. Natural
rubber from the Hevea trees was being used by the American Indians when
Columbus arrived in 1492. Cellulose in different forms, starch and collagen in
leath |
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