Are polyolefins outdated?

نویسندگان

چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Analgesia after Caesarean section: are neuraxial techniques outdated?

Parturients do not feel ill and bedridden like other patients undergoing the same incision. Therefore they dislike motor impairment which is at risk with catheters placed in the lumbar area. The problems with breast feeding are overemphasized but may partly explain the increase in popularity of other modalities such as the use of minor analgetics, single dose spinal morphine covering the first ...

متن کامل

Sedation by non-anesthesiologists: are opioids and benzodiazepines outdated?

At least 3 systematic reviews have assessed the safety of propofol versus traditional agents used for sedation in gastrointestinal endoscopic procedures. These reviews uncovered a marked variability in study design and found the quality of the included randomized controlled trials to be poor. To date there is no demonstrated difference in the endoscopic safety or efficacy of propofol sedation c...

متن کامل

Polyolefins, a Success Story

This paper reports the principal discoveries which have played a major role in the polyolefin field and have positioned polyolefins as the most produced plastics. The early development of polyolefins covering the production of LDPE (Low density polyethylene) at ICI (Imperial Chemical Industries) and the discovery of Phillips or Ziegler-Natta catalysts are highlighted in the first section. In th...

متن کامل

Cross metathesis functionalization of polyolefins.

A cross metathesis strategy is reported for the post-polymerization functionalization of the pendant vinyl groups present in a range of polyolefin architectures. This represents a general strategy for the synthesis of tailored random and block copolymers as well as homopolymers.

متن کامل

Outdating Outdated Objects

In many application scenarios the database is changing quite rapidly Because the man agement of such data is rather expensive and cumbersome many applications like data ware houses only store some aggregations of it We describe a strategy how the evolution of object databases can be controlled by enhanced versioning Therefore we extend the notions of ODMG in order to capture temporal versions W...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Express Polymer Letters

سال: 2020

ISSN: 1788-618X

DOI: 10.3144/expresspolymlett.2020.57